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High price cash recovery: used automation /engineering surplus materials

Cash high price recycling of various industrial control products. If you have inventory, second-hand, or engineering surplus industrial control products, such as VFDs, PLCs, touch screens, servo systems, CNC systems, robots, instruments, sensors, control panels, etc., regardless of quality or old, you can resell them to us, allowing them to be monetized in a timely manner and accelerating your capital recovery.

Since its opening, Longi Electromechanical has a development history of more than 20 years. The company adheres to the principle of “integrity-based, fair dealing between children and the elderly, and fair and conscientious management”, and takes every transaction seriously.

The procurement process follows the principles of “offering the best price”, “not letting partners suffer losses”, “confidentiality and security”, “fast and convenient”, “cash payment”, etc., to ensure that partners can trade with confidence.

With rich industry experience, we can quickly estimate a reasonable acquisition price online through the pictures or videos provided by our partners. After negotiating the price, transactions can be made through logistics collection, online payment, or face-to-face transactions.

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Global Ultrasonic Equipment Maintenance Center

Longi Electromechanical Company uses artificial intelligence AI methods and professional technical teams to professionally repair various types of ultrasonic equipment. It can achieve component level maintenance and repair general problems on the same day, winning valuable time for customer production. There are many types and brands of ultrasonic equipment devices, and currently there are a large number of ultrasonic equipment in the market, with varying quality and old and new. Rongji Electromechanical Company has repaired over 2000 related equipment and accumulated rich maintenance experience.Phone/WhatsApp:+8618028667265

Longi has excellent mechanical and electrical technology, and has great confidence in its repair level. The repaired ultrasonic welding equipment has a one-year warranty for the same problem point. The maintenance cost is relatively low, and the price is lower than the peers.

Longi Electromechanical repairs several types of ultrasonic equipment, including:

Plastic hot plate welding machines, ultrasonic welding machines, high-frequency welding machine maintenance, hot melt hot plate welding machines, multi-head ultrasonic welding machines, ultrasonic plastic welding machines, ultrasonic fusion welding machines, ultrasonic spot welding machines, hot plate welding machines, and hot melt welding machines.

Ultrasonic metal welding machines, ultrasonic metal spot welding machines, ultrasonic metal wire welding machines, ultrasonic metal roll welding machines, solar collector plate welding machines, solar copper pipe punching machines, and copper pipe flanging machines.

Automotive door panel welding machines, automotive interior part welding machines, automotive instrument panel welding machines, automotive bumper welding machines, automotive radiator welding machines, and automotive light welding machines.

Ultrasonic flaw detectors, ultrasonic welding and cutting machines, ultrasonic food cutting machines, ultrasonic tool heads, ultrasonic cutting knives, ultrasonic cake cutting machines, handheld ultrasonic welding machines, ultrasonic cleaners, KN95 mask sealing machines, semi-automatic spot welding machines for flat masks, manual mask spot welding machines, N95 mask earloop ultrasonic welding machines, ultrasonic mask sealing machines, automatic frequency tracking ultrasonic welding machines, handheld ultrasonic spot welding machines, and fully automatic ultrasonic welding machines.

Ultrasonic vibrating plates, ultrasonic power boards, ultrasonic transducers, ultrasonic generators, presses, ultrasonic boosters, ultrasonic welding heads, and supporting tooling.

Rongji Electromechanical has extensive experience in repairing and maintaining this diverse range of ultrasonic equipment, ensuring that these machines continue to operate at peak performance.

Longi Electromechanical has repaired ultrasonic equipment from various brands, including:

Minghe, Changrong, Swiss RINCO, Dingtaihengsheng, Gute, Xinzhi, Taiheda, Donghua, Ruang, American Branson, Daguangdian, Swiss TELSONIC, German SCHUNK, American AMTECH and SONICS, Korean TECHSONIC, Chuxin (SONICTECH), Jiemeng, Jikang, Hekeda, Kejiemeng, Weigute, Meiji, Fukeda, Jieda, and Haoshun.

The company’s experienced engineers are familiar with the repair and maintenance requirements of these brands, ensuring that the ultrasonic equipment is restored to its optimal performance. Rongji Electromechanical’s expertise in repairing a wide range of ultrasonic equipment brands demonstrates its versatility and reliability in the industry.

Over the years of repairing ultrasonic equipment, we have identified the following common faults:

The cleaning water surface does not vibrate, and there is debonding between the vibrator and the load.
The mold head is misaligned.
There is no display when turned on, and there is an overload or overcurrent during the welding process.
The current is too high during testing.
Insufficient welding capacity during the welding process, or the welding heat is too intense.
The vibrator has leakage waves.
The button does not work when pressed.
There is an issue with the travel protection.
There is sound, but the power cannot be adjusted.
The ultrasonic intensity is insufficient.
The transducer ceramic is cracked.
The power tube is burned out.
The voltage stabilization part is not functioning properly.
There are problems with the inductor and isolation transformer.
The vibrator wire is disconnected.
These faults can occur due to various reasons such as wear and tear, improper use, or component failures. It is important to regularly inspect and maintain ultrasonic equipment to identify and address these issues promptly. Our team of experienced engineers at Rongji Electromechanical is well-versed in diagnosing and repairing these common faults, ensuring that your ultrasonic equipment is restored to its optimal performance.

Principles for Ultrasonic Equipment Repair:

  1. Observe first, understand next, and then act, from the outside in.

When encountering problems with ultrasonic equipment, one should not blindly continue operating or rush to take action. It is essential to first inquire with the frontline production staff on duty that day to understand clearly when the problem occurred and the actual fault situation. Check if there were any voltage fluctuations, thunderstorms, or unauthorized disassembly at the scene.

If there is no response from the equipment, it is likely that a fuse or short circuit has occurred. In this case, focus on checking the electrical situation and measuring impedance with a multimeter. For unfamiliar ultrasonic equipment, do not dismantle it immediately. It is necessary to research its structure and related manuals online. When disassembling, pay attention to the coordination process of each part, keep the parts organized, and label anything that needs to be remembered. If necessary, draw simple diagrams. Acting rashly may escalate the problem or even make it impossible to reassemble the equipment.

  1. Simple before complex

Start by ruling out peripheral issues. Factors such as the surrounding environment, electricity, load, raw materials, and molds can all affect the normal operation of the equipment. First, confirm whether these aspects are functioning properly. Clean the equipment and its environment, as this sometimes resolves the issue. For example, oil and dust on some buttons can cause poor contact. If possible, swap two ultrasonic devices or other components for comparison to confirm the problem’s general direction. Only after confirming that the ultrasonic device itself is the issue should you disassemble it or send it out for repair.

For equipment that has had problems in the past, there is a high likelihood of similar failures recurring, so pay close attention to these areas.

  1. Address mechanical issues first

Mechanical problems can be seen with the naked eye, such as issues with the mold. Even if the transducer is working, the equipment may not function properly, which can be determined through touch and comparison. If mechanical problems are not addressed and one blindly searches for electrical causes, it will be like looking for a needle in a haystack and will never be resolved. Admittedly, dealing with mechanical issues can be somewhat challenging, but they must be resolved.

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Global Instrument Maintenance Center

Intelligent Precision Instrument Maintenance Base，Professional maintenance of various intelligent instruments and meters, phone/WhatsApp:+8618028667265, Mr. Guo

Longi Electromechanical specializes in repairing various imported intelligent precision instruments and meters, and has accumulated rich maintenance experience over the years, especially environmental testing instruments, electrical instruments, thermal instruments, acoustic and flow instruments, and electrical instruments. Environmental testing instruments, thermal instruments, acoustic and flow instruments,
We can quickly repair radio instruments, length instruments, environmental testing equipment, quality inspection instruments, etc.
Different instruments have different characteristics and functions, and their circuits and structures are also different. Even for the same instrument, if there are different faults, repairing them is still a different solution. Rongji Company has numerous high-end maintenance engineers equipped with artificial intelligence AI detection instruments, which can provide you with multi-dimensional solutions to various tricky instrument problems.

Over the years, Longi Electromechanical has repaired instruments including but not limited to:

Spectrum analyzers, network analyzers, integrated test instruments, 3D laser scanners, noise figure testers, receivers, telephone testers, high and low-frequency signal sources, audio and video signal analyzers, constant temperature and humidity chambers, thermal shock chambers, simulated transport vibration tables, mechanical vibration tables, AC grounding impedance safety testers, safety comprehensive analyzers, withstand voltage testers, battery internal resistance testers, high-precision multimeters, precision analyzers, gas and liquid analyzers, metal detectors, LCR digital bridges, oscilloscopes, electronic loads, power meters, power analyzers, multimeters, DC power supplies, AC power supplies, CNC power supplies, variable frequency power supplies, and various communication power supplies.

We have repaired the following brands:

Chroma, ITECH, Tonghui, Agilent, Tektronix, Keysight, Fluke, Keithley, Rohde & Schwarz, Lecroy, Anritsu, Rigol, and many more.

Longi Electromechanical strives to provide comprehensive repair services for a wide range of instruments and equipment, ensuring that our customers’ devices are restored to optimal performance.

Longi maintenance engineers possess over twenty years of experience in instrument repair. We have multiple engineers who excel in repairing imported precision instruments. The team works together, enabling faster troubleshooting and quick resolution of complex issues while improving the repair rate of instruments.

Spare parts are fundamental to successful repairs. Many imported instruments and meters require specialized components that cannot be easily replaced with generic market parts. Rongji Electromechanical maintains a long-term stock of electronic components for various instruments, ensuring their availability when needed.

Documentation and manuals are also crucial tools for ensuring rapid repairs. Accessing these resources allows for quick research and analysis of faults, enabling engineers to quickly identify the repair priorities. Longi Electromechanical has a long history of collecting specifications for various brands and models of instruments, greatly aiding in the repair process.

The intelligent instruments that have been carefully repaired by us can generally continue to be used for about 5 years. We promise that when the same malfunction occurs again, our repair service will provide a one-year warranty service.

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Global Touch Screen Repair Centers,Professional maintenance touch screen

Touch screen is a special human-machine dialogue device that has been widely used in daily life, production, and commercial occasions. Touch screens are mainly divided into several forms: resistive screens, capacitive screens, infrared screens, and ultrasonic screens. Because it has too close contact with people and a large part of it is a vitreous structure, the probability of touch screen damage is relatively high. The most common area of damage to touch screens is often the surface touch outer screen, commonly known as the “touchpad,” which can be used normally after replacement.
Rongji Electromechanical Maintenance has been using touch screens in the industrial, commercial, medical, and military fields for over 20 years. Currently, in these areas, resistance screens are mostly used due to reliability and safety considerations. The automotive industry uses both resistive and capacitive screens, and touch screens in this field, whether they are capacitive or resistive, can be repaired by us.

Step 1: Remove the back cover and remove the motherboard screws

Touch screen manufacturers, considering profit, often design touch panels and even LCD components as non-standard products, and do not disclose the drivers and circuits to the public. If standard touch panels and controllers are installed, they are often not compatible.

Step 2: Remove the outer shell and use a hair dryer to heat up the film

Longi Electromechanical Company has a team of engineers who have been researching the reverse engineering of various touch screens for a long time. They have explored a solution and replacement process for touch screen accessories from the bottom layer or touch panel technology. They can perfectly use the touch panel and other accessories produced by Longi Company to replace the original ones, and solve problems for customers while significantly reducing maintenance costs.

Step 3: Peel off the film and remove the touchpad

Most resistive screens and a small portion of capacitive screens can be purchased from touch pads produced by Longi Company. Following the replacement method we provide, they can be installed and used normally.

Step 4: Apply double-sided tape to the touch screen border and place a new touch pad on it

A small number of resistive screens and some capacitive screens, due to their special design, customers can send the entire touch screen to Rongji Company by mail. We use professional software analysis and judgment, and through hardware processing and software patching methods, we can achieve cracking and replacement.

Step 5: Install the motherboard LCD and flip it over to test if the touchpad is functioning properly

Similarly, for accessories such as LCD, high-voltage bars, and light tubes, similar methods can be used to achieve functional repair of touch screens without affecting their use.

Step 6: After successful testing, apply the film and replace the touchpad

During the use of touch screens, in addition to the mentioned accessory issues, there may also be circuit failures such as power boards or motherboards. For example, it is not displayed, or the display is abnormal. This situation belongs to a hardware malfunction of the circuit. The entire machine can be sent to the headquarters of Longi Company by mail, and we will use circuit maintenance methods for repair.

A special situation is when there is a problem with the touch screen software, such as the battery running out or data being lost. This situation is quite troublesome. If the customer has backed up data, we can help them re-enter it and it can be used normally. If the customer does not have backup data and cannot contact the equipment manufacturer to find the data, the only solution is to rewrite the appropriate touch screen program according to the process and equipment flow. As touch screens are secondary development applications, the programming difficulty is not too high. However, it will take time to pair with other devices in the system, such as PLCs.

Longi Electromechanical Company has repaired the following brands of touch screens:

Siemens touch screens, Proface touch screens, Mitsubishi touch screens, Fuji touch screens, Panasonic touch screens, OMRON touch screens, WEINVIEW touch screens, Koyo touch screens, Delta touch screens, Toyota JAT touch screens for air-jet looms, Staubli touch screens, Beijer touch screens, AB (Allen-Bradley) Rockwell touch screens, Hitech touch screens, Schneider touch screens, Toyo touch screens, DMC touch screens, MCGS (Kunlun Tongtai) touch screens, Touchwin touch screens, General touch screens, Red Lion touch screens, B&R (Beckhoff & Rautert) touch screens, LG touch screens, M21 touch screens, Fatek (Yonghong) touch screens, IDEC (Waizu) touch screens, Wecon touch screens, Pingtong touch screens, Fanuc touch screens, Lenze touch screens, Advantech touch screens, Hakko touch screens, Yushin touch screens, UNIOP touch screens, Shihlin (See) touch screens, Parker touch screens, Eura touch screens, and Hakko White Light touch screens, among others.

Please note that some of the brand names mentioned may be trademarks or registered trademarks of their respective companies. The listing here is for informational purposes only and does not imply any affiliation or endorsement by Longi Electromechanical Company or any of the mentioned brands.

Common Touch Screen Issues:

Display is visible but cannot be touched or clicked, or the touch response is poor. In most cases, this is due to a faulty touch panel. Sometimes recalibrating can solve the problem, but mostly the touch panel needs to be replaced.

The touch screen does not display anything, and even the indicator lights are not on. This situation usually indicates a problem with the power supply unit of the touch screen.

The touch screen functions but displays a black screen, while the indicator lights are normal. This is typically caused by a burned-out backlight tube inside the screen.

The touch screen displays a distorted image or abnormal colors. This is often a problem with the liquid crystal display (LCD) or could be caused by issues with the connecting cables.

The touch screen displays a communication error, and the response to touch is very slow. This issue is not with the touch screen itself but rather with the connection between the Programmable Logic Controller (PLC) or other devices and the touch screen. In many cases, the problem lies with the connecting cables or plugs.

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Global Servo CNC maintenance center

Global Servo CNC maintenance center,Professional maintenance of servo CNC systems

Remember to contact Longi Electromechanical for any issues with servo and CNC systems!

Servo systems differ from VFDs in that they offer higher precision and typically come with delicate encoders. Servo motors are synchronous motors with magnets inside, and if not handled carefully during disassembly and assembly, their original performance may not be restored. Additionally, different servo drivers cannot be used interchangeably with other servo motors. This means that during the repair of a servo driver, a corresponding servo motor and cable plug are required for proper testing. Similarly, repairing a servo motor also requires a matching servo driver for testing, which can pose challenges for many maintenance personnel.

As for CNC (Computer Numerical Control) systems, most are embedded industrial computer types with closed control systems. Each manufacturer has its own design ideas, programming methods, wiring, and communication architectures, making them incompatible with one another.

Longi Electromechanical Company has designed various styles of servo and CNC maintenance test benches to test the working conditions of different CNC systems, servo drivers, or servo motors. When servo systems encounter issues such as no display, phase loss, overvoltage, undervoltage, overcurrent, grounding, overload, module explosion, magnet loss, parameter errors, encoder failures, communication alarms, etc., the corresponding platform can be used to test and diagnose the problem.

Repair Hotline: +8618028667265 Mr. Guo

After resolving these issues, the servo system also needs to undergo a simulated load test to avoid problems such as overcurrent under load conditions, even if it performs well under no-load conditions. This ensures that the servo system is fully functional and ready for use in actual applications.

For the CNC system, it is also necessary to conduct simulated operation before normal delivery to avoid any discrepancy with the on-site parameters. Currently, Rongji Electromechanical possesses hundreds of servo and CNC test benches, which can quickly identify problem areas and promptly resolve issues. With these advanced testing facilities, Longi Electromechanical ensures the smooth operation and reliability of the repaired equipment.

The Servo and CNC Repair Center established by Longi Company currently has over 20 skilled and experienced maintenance engineers who specialize in providing repair services for different brands and specifications of servo and CNC systems. They implement tailored repair solutions for different maintenance projects, ensuring efficient and high-quality service for customers. By helping customers save valuable production time and reducing their maintenance costs, Rongji truly cares about the urgent needs of its customers and strives for common development and progress together.

We have repaired the following brands of servo and CNC systems:

Servo Systems

  • Lenze Servo Systems
  • Siemens Servo Systems
  • Panasonic Servo Systems
  • Eurotherm Servo Systems
  • Yaskawa Servo Systems
  • Fuji Servo Systems
  • Delta Servo Systems
  • Omron Servo Systems
  • Fanuc Servo Systems
  • Moog Servo Systems
  • TECO Servo Systems
  • Norgren Servo Systems
  • SSB Servo Drive Systems
  • Hitachi Servo Systems
  • Toshiba Servo Systems
  • Denso Servo Systems
  • Parvex Servo Systems

CNC Systems

  • Mitsubishi Servo Systems
  • Sanyo Servo Systems
  • Mitsubishi CNC (MITSUBISHI)
  • Fanuc CNC (FANUC)
  • Siemens CNC (SIEMENS)
  • Brother CNC (BROTHER)
  • Mazak CNC (MAZAK)
  • GSK (Guangzhou Numerical Control)
  • Huazhong Numerical Control
  • Fagor CNC
  • Heidenhain
  • Haas CNC
  • NUM (France)
  • Hurco (USA)
  • KND (Beijing KND Technology Co., Ltd.)
  • Leadshine
  • Syntec
  • Shenyang Machine Tool i5
    *凯恩帝 (KND)

Note: Some of the brand names mentioned may be trademarks or registered trademarks of their respective owners. The listing here is for informational purposes only and does not imply any affiliation or endorsement by Rongji Electromechanical or any of the mentioned brands.

Machine Tool Brands

(1) European and American Machine Tools:

  • Gildemeister
  • Cincinnati
  • Fidia
  • Hardinge
  • Micron
  • Giddings
  • Fadal
  • Hermle
  • Pittler
  • Gleason
  • Thyssen Group
  • Mandelli
  • Sachman
  • Bridgeport
  • Hueller-Hille
  • Starrag
  • Heckert
  • Emag
  • Milltronics
  • Hass
  • Strojimport
  • Spinner
  • Parpas

(2) Japanese and Korean Machine Tools:

  • Makino
  • Mazak
  • Okuma
  • Nigata
  • SNK
  • Koyo Machinery Industry
  • Hyundai Heavy Industries
  • Daewoo Machine Tool
  • Mori Seiki
  • Mectron

(3) Taiwanese and Hong Kong Machine Tools:

  • Hardford
  • Yang Iron Machine Tool
  • Leadwell
  • Taichung Precision Machinery
  • Dick Lyons
  • Feeler
  • Chen Ho Iron Works
  • Chi Fa Machinery
  • Hunghsin Precision Machinery
  • Johnford
  • Kaofong Industrial
  • Tong-Tai Machinery
  • OUMA Technology
  • Yeongchin Machinery Industry
  • AWEA
  • Kaoming Precision Machinery
  • Jiate Machinery
  • Leeport (Hong Kong)
  • Protechnic (Hong Kong)

(4) Chinese Mainland Machine Tools:

  • Guilin Machine Tool
  • Yunnan Machine Tool
  • Beijing No.2 Machine Tool Plant
  • Beijing No.3 Machine Tool Plant
  • Tianjin No.1 Machine Tool Plant
  • Shenyang No.1 Machine Tool Plant
  • Jinan No.1 Machine Tool Plant
  • Qinghai No.1 Machine Tool Plant
  • Changzhou Machine Tool Factory
  • Zongheng International (formerly Nantong Machine Tool)
  • Dahe Machine Tool Plant
  • Baoji Machine Tool Plant
  • Guilin No.2 Machine Tool Plant
  • Wanjia Machine Tool Co., Ltd.
  • Tianjin Delian Machine Tool Service Co., Ltd.

Note: The list provided above is comprehensive but not exhaustive. Machine tool brands and manufacturers are constantly evolving, and new players may have emerged since the compilation of this list. Always refer to the latest industry updates for the most accurate information.

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Global Variable Frequency Drive (VFD) repair center

“Longi Electromechanical” has more than 20 years of experience in industrial control maintenance, and is one of the earliest companies engaged in VFD repair. Equipped with artificial intelligence AI maintenance instruments, it specializes in emergency repair of various equipment, with high technical efficiency. It has repaired more than 200,000 units of equipment, including ultrasonic, robot, charging pile, inverter,Variable Frequency Drive (VFD), touch screen, servo, intelligent instrument, industrial control machine, PLC and other products. General problems can be repaired on the same day. LONGI promises you that “if it can’t be repaired, we won’t charge you”. And it provides lifelong maintenance service and free technical consultation for inspection! For urgent repair consultation, please call the contact number or add WHATSAPP maintenance hotline: +8618028667265 Mr. Guo

From European and American brands to Japanese, Korean, and Taiwanese ones, until various domestic brands, we have repaired countless models and specifications of VFDs. In the process of serving our customers, we have continuously learned and accumulated maintenance experience to enhance our skills. We specialize not only in repairing VFDs but also in summarizing various maintenance experiences, elevating them to a theoretical level. We have published the book “VFD Maintenance Technology” and offered VFD maintenance training, thereby promoting the development of the VFD maintenance industry. Longi Electromechanical Company has repaired VFDs from the following brands:

European and American Brands

ABB drives, SEW drives, LUST VFD, LENZE VSD, Schneider drives, CT drives, KEB VSD, Siemens drives, Eurotherm VFD, G.E. VFD, VACON VSD, Danfoss VFD, SIEI VFD, AB VFD, Emerson VFD, ROBICON VFD, Ansaldo VFD, Bosch Rexroth VSD, etc.

Japanese Brands:

Fuji INVERTER, Mitsubishi INVERTER, Yaskawa INVERTER, Omron INVERTER, Panasonic INVERTER, Toshiba INVERTER, Sumner INVERTER, Tooka INVERTER, Higashikawa INVERTER, Sanken INVERTER, Kasia INVERTER, Toyo INVERTER, Hitachi INVERTER, Meidensha INVERTER, etc.

Taiwanese Brands:

Oulin INVERTER, Delta INVERTER, Taian INVERTER, Teco INVERTER, Powtran INVERTER, Dongling INVERTER, Lijia INVERTER, Ningmao INVERTER, Sanji INVERTER, Hongquan INVERTER, Dongli INVERTER, Kaichi INVERTER, Shenghua INVERTER, Adlee INVERTER, Shihlin INVERTER, Teco INVERTER, Sanchuan INVERTER, Dongweiting INVERTER, Fuhua INVERTER, Taian INVERTER (note: Taian is repeated, possibly a mistake in the original list), Longxing INVERTER, Jiudesongyi INVERTER, Tend INVERTER, Chuangjie INVERTER, etc.

Chinese Mainland brands:

Senlan Inverter, Jialing Inverter, Yineng Inverter, Hailipu Inverter, Haili Inverter, Lebang Inverter, Xinnuo Inverter, Kemron Inverter, Alpha Inverter, Rifeng Inverter, Shidai Inverter, Bost Inverter, Gaobang Inverter, Kaituo Inverter, Sinus Inverter, Sepaxin Inverter, Huifeng Inverter, Saipu Inverter, Weier Inverter, Huawei Inverter, Ansheng Inverter, Anbangxin Inverter, Jiaxin Inverter, Ripu Inverter, Chint Inverter, Delixi Inverter, Sifang Inverter, Geli Te Inverter, Kangwo Inverter, Jina Inverter, Richuan Inverter, Weikeda Inverter, Oura Inverter, Sanjing Inverter, Jintian Inverter, Xilin Inverter, Delixi Inverter, Yingweiteng Inverter, Chunri Inverter, Xinjie, Kemron-Bong Inverter, Nihonye Inverter, Edison Inverter

Other brands:
Migao VFD, Rongqi VFD, Kaiqi VFD, Shiyunjie VFD, Huichuan VFD, Yuzhang VFD, Tianchong VFD, Rongshang Tongda VFD, LG VFD, Hyundai VFD, Daewoo VFD, Samsung VFD, etc.

Longi Electromechanical Company specializes in the maintenance of VFDs and strictly requires its engineers to followlow standard operating procedures. Upon receiving a unit, the engineers carefully inspect its exterior and clarify any fault conditions with the customer before beginning work. Any removed circuit boards are cleaned using ultrasonic cleaning equipment. Repaired circuit boards are coated with high-temperature and high-pressure-resistant insulating paint, dried in a drying machine, and then reinstalled in the VFD, with measures taken to prevent corrosion and interference.

The repaired VFD will undergo a simulated operation with load using a heavy-load test bench to avoid any potential issues that may arise under actual load conditions on site.

When it comes to VFD maintenance, most cases are related to the equipment on site. Sometimes a standalone unit may have been repaired, but it doesn’t work properly when installed on site. In some cases, the problem lies with the system rather than the VFD itself. For such issues, if the customer requests on-site service, we will do our utmost to resolve the problem for them. If the location is far away, such as in another province, we can use tools like video conferencing and phone calls to allow our engineers to remotely diagnose and resolve the on-site issues for the customer.

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Hello,Welcome To Longi！

As a professional company engaged in the sales and services of second-hand industrial control products, we are committed to providing high-quality and performance-oriented second-hand industrial control products to help customers improve production efficiency and reduce costs. The company was founded in 2000 and has gradually become a leading supplier of second-hand industrial control products in the industry through years of development.

Our product range is diverse, including second-hand frequency converters, PLCs, servo drivers, servo motors, industrial touch screens, instruments and meters. These products have undergone strict selection and testing to ensure that their performance and reliability meet the expectations of customers. We believe that these products will be able to meet your various needs and bring huge value to your industrial automation process.

In terms of technical services, we promise to provide customers with comprehensive engineering technical services. Whether you encounter any problems in the process of purchasing products or technical difficulties during operation, we will provide you with timely and professional support. Our technical team will provide you with the most appropriate solution based on your specific situation to ensure the smooth implementation of your project.

To ensure the reliable quality of the products purchased by customers, we provide a three-month warranty service. During the warranty period, if the product has a quality problem, we will provide free maintenance or replacement services for you. Our warranty service aims to allow customers to purchase and use with confidence, making your purchasing experience more pleasant.

If you have any questions or needs about our products or services, please feel free to contact us. You can contact us through telephone, email or visiting our office address. We will serve you wholeheartedly and look forward to cooperating with you.

In conclusion, as a professional second-hand industrial control product company, we use high-quality products, perfect services, and reliable warranties to accompany your industrial automation process. We believe that cooperating with us will be a wise choice for you, and we will do our best to help you achieve your business goals.

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Difuss Inverter DS9 Series Operation Manual User Guide

I. Introduction to Operation Panel Functions and Parameter Settings

Operation Panel Functions

The Difuss Inverter DS9 series features an intuitive and user-friendly operation panel, which primarily comprises a data display area, function indicators, a numeric display area, and multiple function keys. The data display area shows the current operating status, set values, and monitoring data. Function indicators such as IRUN (Running Indicator) and ILOCAL/REMOTE (Operation Mode Indicator) help users quickly understand the inverter’s working status. The numeric display area, with a 5-digit LED display, supports the display of set frequency, output frequency, various monitoring data, and alarm codes. Function keys include PRG (Program Key), ENTER (Confirm Key), FUN (Multi-function Key), Shift Key, RUN (Run Key), and STOP/RES (Stop/Reset Key), facilitating parameter setting and operational control.

Function diagram of DS9 frequency converter operation panel

Parameter Settings

1. Setting Rated Frequency, Current, and Power

The DS9 inverter allows users to set the motor’s rated frequency, current, and power based on actual needs. These parameters are typically set in the P1 group of motor parameters. For instance, the motor’s rated power is set via P1-01, and its rated current is set via P1-03. Proper setting of these parameters is crucial for the normal operation of the inverter, ensuring that the motor operates stably within its rated working range.

2. Setting Upper and Lower Limit Frequencies

The upper and lower limit frequencies are set through parameters P0-12 and P0-14, respectively. The upper limit frequency defines the maximum frequency output by the inverter, while the lower limit frequency defines the minimum output frequency. Setting these parameters helps protect the motor from overload or damage during low-speed operation, ensuring stable operation within the set frequency range.

Application Macro Settings

CNC Machine Tool 100Hz Macro

By setting P0-29=11, you can select the CNC Machine Tool 100Hz macro. Tailored for CNC machine tool applications, this macro ensures stable inverter operation at 100Hz, meeting the high precision and stability requirements of CNC machine tools.

Spindle 400Hz Macro

By setting P0-29=21, 22, or 23, you can select different spindle 400Hz macros. Designed for high-speed spindle motors, these macros support output frequencies of up to 400Hz, catering to the needs of precision machining and high-speed cutting. Users can choose the appropriate macro based on specific application scenarios and fine-tune it through parameters like P0-03 and P0-08 to achieve optimal performance.

Basic wiring diagram of DS9 frequency converter

II. Terminal Control and External Speed Regulation Settings

Forward and Reverse Control

Achieving forward and reverse control of the inverter through terminals is straightforward. First, configure terminal X1 for forward operation (FWD) and terminal X2 for reverse operation (REV). The specific settings are as follows:

  • Enter the P4 group of input terminal settings and set P4-00 to 1 (X1 terminal for forward operation).
  • Set P4-01 to 2 (X2 terminal for reverse operation).

After these settings, controlling the on/off states of terminals X1 and X2 via external switches or PLCs enables forward and reverse control of the inverter.

External Potentiometer Speed Regulation

External potentiometer speed regulation is a commonly used speed control method that adjusts the inverter’s output frequency by changing the potentiometer’s resistance. The specific settings are as follows:

  • Configure AI1 terminal as an analog input to receive voltage signals from an external potentiometer. Select the AI1 curve via parameter P4-33 and set parameters such as P4-13 to P4-16 to define the correspondence between input voltage and output frequency.
  • During wiring, connect the sliding end of the external potentiometer to the AI1 terminal and its fixed ends to the +10V and GND terminals, respectively.

After completing the settings and wiring, rotating the potentiometer changes the inverter’s output frequency, enabling speed regulation.

III. Fault Code Analysis and Solutions

The DS9 inverter boasts a comprehensive fault protection mechanism that stops the inverter promptly and displays the corresponding fault code in case of a fault. Here are some common fault codes and their solutions:

  • Err01 (Inverter Unit Protection): May be caused by output circuit short circuit, excessive length of motor and inverter wiring, or module overheating. Solutions include troubleshooting peripheral issues, installing reactors or output filters, and checking for blocked air ducts.
  • Err02 (Acceleration Overcurrent): May result from too short an acceleration time, low voltage, or excessive load. Solutions include increasing the acceleration time, adjusting the voltage to the normal range, or reducing the load.
  • Err03 (Deceleration Overcurrent): Similar to acceleration overcurrent, it may be caused by too short a deceleration time, low voltage, or excessive load. The solutions are also similar.
  • Err14 (Module Overheating): May be due to high ambient temperature, blocked air ducts, or damaged fans. Solutions include lowering the ambient temperature, cleaning the air ducts, or replacing the fans.

When encountering a fault, users should first look up possible fault causes based on the displayed fault code and follow the corresponding solutions. If the problem persists, users should promptly contact the inverter manufacturer or agent for technical support.

IV. Conclusion

The Difuss Inverter DS9 Series Operation Manual provides users with a comprehensive user guide, covering operation panel function introduction, parameter setting methods, terminal control and external speed regulation settings, fault code analysis, and troubleshooting. By carefully reading and following the instructions in the manual, users can easily master the operation and maintenance skills of the inverter, ensuring stable and efficient equipment use.

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User Manual Guide for Convo Inverter FSCG05 Series

I. Introduction to Operating Panel Functions and Initialization Settings

1. Operating Panel Function Introduction

The Convo FSCG05 series inverters come equipped with an intuitive operating panel that offers extensive functionalities for parameter setting, monitoring, and control.

2. Factory Default Initialization Settings
Function diagram of CONVO inverter CVF-G5 panel

To restore the inverter to its factory default settings, you need to modify specific parameters. The key parameter to be set is b-11 (Parameter Initialization). Here’s how to do it:

  • Parameter and Setting: b-11 = 1
  • Procedure:
    1. Access the advanced parameter mode by setting b-0 = 2.
    2. Navigate to b-11 and set its value to 1.
    3. Save the setting and restart the inverter to apply the factory defaults.
3. Copying and Downloading Parameters via Operating Panel

Copying Parameters:

  • Procedure for KP51B Keypad:
    1. Set the source inverter to parameter copy mode by pressing Enter, Stop, Down, Enter sequentially.
    2. Remove the keypad from the source inverter and insert it into the target inverter.
    3. Initiate the parameter download to the target inverter by pressing Enter, Stop, Down, Down sequentially.
  • Procedure for KP51S Keypad (due to limited memory, parameters need to be copied in two batches):
    • For copying B and L parameters: Press Enter, Stop, Down, Down, Enter.
    • For copying H and E parameters: Press Enter, Stop, Down, Stop, Down.
    • To copy all B, L, H, and E parameters, follow the above steps for each batch.

Downloading Parameters:

  • Simply reverse the above steps to download parameters from the keypad to an inverter.

II. Terminal Control for Forward/Reverse Rotation and Potentiometer Speed Regulation

CONVO frequency converter SCG05 multi machine RS485 communication synchronization function diagram
Setting Parameters for Terminal Control
  • Forward/Reverse Rotation Control:
    • Set b-3 to select the control mode (e.g., 1 for external terminal control with keyboard stop disabled).
    • Configure the function of terminals X1, X2, FWD, and REV via parameters like L-47 to L-53 based on your control requirements.
  • Potentiometer Speed Regulation:
    • Set b-1 to 0 to use the potentiometer on the operating panel for speed control.
    • No additional parameter settings are required if using the panel potentiometer exclusively.

CONVO is a brand under Bosch Rexroth,By following these steps and adjusting the specified parameters, you can effectively control the operation of your Convo FSCG05 series inverter, whether through the operating panel, external terminals, or by restoring factory settings. This user manual guide aims to provide a comprehensive reference for smooth and efficient inverter operation.

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User Manual Guide for JTE330 Series Inverter by Jintian

The JTE330 series inverter from Jintian is a high-performance vector inverter widely used in industrial automation control systems. To assist you in utilizing this inverter more effectively, this article will provide a detailed introduction to its operation panel functions, parameter settings, and specific operation procedures.

Jintian frequency converter JTE330 basic wiring diagram

1. Introduction to Operation Panel Functions

The JTE330 series inverter features an intuitive operation panel that allows users to monitor and control the inverter’s operation status. The panel typically includes buttons for frequency adjustment, mode selection, start/stop, and parameter settings.

  • Frequency Adjustment Buttons: These allow users to manually adjust the output frequency of the inverter.
  • Mode Selection Button: This button toggles between different operational modes, such as frequency setting, parameter adjustment, and fault diagnosis.
  • Start/Stop Button: Used to start or stop the inverter’s output.
  • Parameter Setting Buttons: These buttons are used to navigate through the inverter’s parameter settings for detailed configuration.

2. Controlling Inverter Operation Using “Preset Frequency F0-08” and Panel Start Mode

To control the inverter using the preset frequency F0-08 and panel start mode, you need to set the following specific parameters:

  1. Enter Parameter Setting Mode:
    • Press the “Mode” button to enter the parameter setting mode.
    • Use the navigation buttons to select the parameter you wish to adjust.
  2. Set Preset Frequency F0-08:
    • Locate parameter F0-08, which represents the preset frequency.
    • Adjust the value of F0-08 to the desired output frequency using the frequency adjustment buttons.
  3. Enable Panel Start Mode:
    • Navigate to the relevant parameter that controls the start mode (usually labeled as a start source selection parameter).
    • Set this parameter to “Panel” or the equivalent option to enable panel start mode.
  4. Save Settings and Exit:
    • After setting the desired parameters, press the “Save” or equivalent button to store the settings.
    • Exit the parameter setting mode by pressing the “Mode” button again.

Now, when you press the start button on the operation panel, the inverter will output the frequency set in F0-08.

3. Restoring Factory Default Settings

To restore the inverter to its factory default settings, follow these steps:

  1. Enter Parameter Setting Mode:
    • As described above, enter the parameter setting mode using the “Mode” button.
  2. Navigate to Reset Parameter:
    • Use the navigation buttons to locate the parameter responsible for resetting the inverter to factory defaults. This parameter is usually labeled as “Reset to Factory Defaults” or something similar.
  3. Perform Reset:
    • Set the reset parameter to “Yes” or the equivalent value to initiate the reset process.
    • The inverter may require confirmation; follow any on-screen prompts to complete the reset.
  4. Save Settings and Exit:
    • After the reset is complete, press the “Save” button to store the factory default settings.
    • Exit the parameter setting mode.

4. Setting Up Speed Tracking Function

The speed tracking function allows the inverter to automatically adjust its output frequency to match the speed of an external motor or rotating equipment. To set up this function:

  1. Enter Parameter Setting Mode:
    • Enter the parameter setting mode as described earlier.
  2. Locate Speed Tracking Parameters:
    • Navigate to the parameters related to the speed tracking function. These parameters may include settings for enabling speed tracking, selecting the speed tracking source, and adjusting speed tracking gain.
  3. Enable Speed Tracking:
    • Set the parameter that enables speed tracking to “On” or the equivalent value.
  4. Configure Speed Tracking Source:
    • Select the appropriate speed tracking source, which could be an encoder, another motor, or another external signal.
  5. Adjust Speed Tracking Gain:
    • Use the related parameter to adjust the gain of the speed tracking system. This setting determines how sensitive the inverter’s output frequency is to changes in the tracked speed.
  6. Save Settings and Exit:
    • After configuring all necessary parameters, press the “Save” button to store the settings.
    • Exit the parameter setting mode.

By following these guidelines, you can effectively utilize the JTE330 series inverter’s operation panel to control its operation, restore factory default settings, and set up advanced functions like speed tracking.

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Analysis and Solutions for Faults F30005 and F30025 in Siemens G130_G150 Series Frequency Converters

Introduction

Siemens G130 and G150 series frequency converters play a crucial role in industrial automation systems, and their stability and reliability are vital for the smooth operation of production processes. However, in practical applications, these converters may encounter various faults, with F30005 (overload) and F30025 (overheating) being two of the most common ones. This article aims to provide an in-depth analysis of the meanings and causes of these faults and offer corresponding solutions. Additionally, a practical maintenance case is presented to illustrate the complexity of fault handling and the strategies employed.

G130 physical picture

Fault Analysis

F30025 (Overheating)

The F30025 fault typically indicates that the power unit’s chip temperature is too high. This fault can be caused by various factors, including but not limited to:

  • Poor Heat Dissipation: Issues such as fan failure, obstructed ventilation, or excessively high ambient temperatures can prevent the power unit from effectively dissipating heat.
  • Overload Operation: Prolonged high-load operation generates significant heat within the power unit.
  • High Pulse Frequency: Operating at high frequencies increases the heat generation in the power unit.
fault F30025

F30005 (Overload)

The F30005 fault signifies an I2t overload in the power unit. Possible causes include:

  • Excessive Load: The motor or mechanical load exceeds the rated power of the frequency converter.
  • Unreasonable Operating Cycle: Continuous operation without sufficient cooling time for the frequency converter.
  • Improper Parameter Settings: Inappropriate settings for parameters such as acceleration and deceleration times, leading to excessive output current from the frequency converter.

Additionally, faults like overcurrent (F30001) and grounding (F30021) are also closely related to current detection and judgment, indicating output currents exceeding rated values and insulation damage to motors or cables, respectively.

FAULT F30005

Mechanisms of Fault Occurrence

Faults Occurring at Power-On

Faults that occur immediately upon power-on often point to hardware issues, such as damaged current sensors (transformers) or related detection circuit problems. These faults typically manifest as errors as soon as power is applied and are difficult to resolve through parameter adjustments.

Faults Occurring During Operation

Faults that arise during operation may be the result of a combination of factors, including load variations, ambient temperatures, and ventilation conditions. Such faults are usually addressed by optimizing parameters, reducing load rates, and improving ventilation conditions.

G130 internal physical image

Solutions

Optimizing Parameter Adjustments

  • Adjust Operating Cycles: Arrange the working and rest times of the frequency converter reasonably to avoid prolonged continuous operation.
  • Adjust Acceleration/Deceleration Times: Modify acceleration and deceleration times based on load characteristics to reduce the impact on the frequency converter.
  • Increase Preset Values for Electronic Thermal Protection: If the motor and frequency converter are not overloaded, the preset values for electronic thermal protection can be appropriately increased.

Reducing Load Rates

  • Check and Optimize Mechanical Loads: Ensure that mechanical loads operate within the rated power range of the frequency converter.
  • Adjust Gear Ratios: Where possible, adjust gear ratios to reduce the load on the motor axis.

Ensuring Adequate Ventilation

  • Regularly Clean Heat Sinks: Ensure that heat sink fins are free of dust and that fans are operating normally.
  • Improve Ventilation Conditions: Ensure that the frequency converter is installed in a well-ventilated location, away from direct sunlight and high-temperature environments.
ESM2000-9983

Fault Repair

Handling Faulty Current Sensors

  • Check Current Sensors: Use a multimeter to test the output of the current sensors for normality.
  • Replace Damaged Current Sensors: If a sensor is confirmed to be damaged, it should be promptly replaced with a compatible model.
  • Adopt Temporary Solutions: In emergencies, if only two current sensors are available, the frequency converter can be set to V/F control mode, but risks should be noted.

Repairing Drive Boards

  • Check Optocouplers on Drive Boards: Optocouplers are key components for detecting the voltage drop across switching transistors and should be replaced if damaged.
  • Rewire or Replace Faulty Components: If other components (such as resistors, capacitors) on the drive board are damaged, they should be rewired or replaced.

Checking Current Detection Circuits

  • Trace Current Signal Paths: From the current sensors to the frequency converter’s control circuit, gradually check each component along the signal path.
  • Use Oscilloscopes to Detect Signal Waveforms: Observe the waveforms of current signals through an oscilloscope to identify any abnormalities.
  • Repair or Replace Faulty Components: Based on the detection results, repair or replace faulty components.
G130 CPU board

Practical Maintenance Case

In actual maintenance, we encountered a typical case that fully demonstrated the complexity of concurrent F30005 and F30025 faults and their solutions. The frequency converter immediately displayed an F30025 fault upon power-on, and further operation (such as pressing the ↓ key) revealed an F30005 fault, indicating simultaneous issues of overheating and overload.

Upon thorough inspection, it was found that the root cause was a damaged current sensor. This frequency converter utilized three ESM2000-9922 current sensors, each with a maximum secondary side output current of 400mA, collectively responsible for monitoring the three-phase current output of the converter. According to Kirchhoff’s Current Law, the sum of currents entering a node at any moment should equal the sum of currents exiting the node. In a three-phase system, this means that the algebraic sum of any two phase currents must equal the negative of the third phase current. Therefore, theoretically, as long as two current sensors are functioning normally, the reading of the third sensor can be inferred from their data.

However, this substitution scheme carries risks in practical operation, requiring that the three-phase currents and voltages output by the frequency converter remain relatively balanced and that the angle between the currents is close to the ideal 120°. Furthermore, since this frequency converter supports vector control, precise current measurement is crucial. Therefore, when adopting this temporary substitution scheme, we had to switch the converter’s operating mode from vector control to V/F control to avoid damaging the IGBT module due to inaccurate current calculations.

During the specific operation, we removed the damaged current sensor and reconnected the remaining two sensors. Then, through the frequency converter’s parameter setting interface, we changed its operating mode to V/F control. After these steps, although the frequency converter could be started and operated, the current values displayed on the screen were slightly lower than the actual values. In emergencies, this makeshift solution can temporarily restore the functionality of the frequency converter and ensure the continuity of the production process. However, in the long run, we still recommend replacing the damaged current sensor as soon as possible and restoring the frequency converter to its original vector control mode to ensure its performance and accuracy.

G130 power board

Conclusion

Although F30005 and F30025 faults are common in Siemens G130 and G150 series frequency converters, they can be effectively prevented and resolved through reasonable parameter adjustments, load reduction, improved ventilation conditions, and prompt fault repairs. In practical applications, targeted measures should be taken based on specific situations to ensure the stable operation of the frequency converters. Meanwhile, through meticulous inspections and flexible strategies, we can identify the key to solving problems and ensure the long-term reliable operation of the equipment.

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Shanghai RMSPD INVERTER SPD990M Mini User Guide

I. Introduction to Inverter Panel Functions and Basic Operations

1. Panel Function Introduction
Function diagram of RMSPD INVERTER SPD990M operation panel

The RMSPD INVERTER SPD990M Mini is equipped with an LED operation panel that primarily includes the following function keys:

  • Shift Key: Used to select digits for modification when editing data.
  • Multi-function Key: Function set by parameter F8.04, defaulting to Jog.
  • Analog Potentiometer: Used for frequency setting.
  • Programming Key: Enters or exits the programming mode.
  • Increment/Decrement Keys: Adjusts data or function codes.
  • Confirm Key: Enters the next menu level or confirms data.
  • Run Key: Starts the inverter.
  • Stop/Reset Key: Stops the inverter or resets faults.
2. Resetting to Factory Defaults

To reset the inverter to its factory settings, follow these steps:

  1. Enter the programming mode (press the programming key).
  2. Use the shift and increment/decrement keys to select function code F8.03.
  3. Press the confirm key to enter F8.03 settings and select “1” for factory reset.
  4. Press the confirm key again to save and exit.
3. Starting, Stopping, and Adjusting Frequency via Panel
  • Starting: Press the run key to start the inverter.
  • Stopping: Press the stop key to stop the inverter.
  • Frequency Adjustment: Use the analog potentiometer or increment/decrement keys to adjust the output frequency.
4. Terminal Forward/Reverse Control and External Potentiometer Frequency Setting
  • Forward/Reverse Control: Control via terminals X1 (forward) and X2 (reverse), requiring F2.13 and F2.14 to be set to corresponding functions.
  • External Potentiometer Frequency Setting: Connect to the AVI terminal and set F0.03 to 3 (AVI analog input).

II. PID Function Control for a Single Water Pump Motor

1. PID Function Wiring and Parameter Settings
  • Wiring: Connect the PID feedback signal to the AVI or ACI terminal.
  • Parameter Settings:
    • F3.00: Enable PID regulation, selecting appropriate input and feedback channels.
    • F3.01: Set the PID setpoint.
    • F3.02: Adjust the feedback channel gain.
    • F3.03 and F3.04: Set the proportional gain (P) and integral time (Ti).
2. Sleep Function Settings and Wake-up
  • Sleep Settings:
    • F3.10 and F3.11: Set sleep and wake-up threshold coefficients.
    • F3.12 and F3.13: Set sleep and wake-up delay times.
  • Wake-up: When the feedback value is less than the wake-up threshold, the inverter will automatically wake up.

III. Controlling the Inverter via a Weinview Touchscreen using Modbus Protocol

1. Inverter Settings
  • Communication Parameters:
    • F6.00: Set the device address.
    • F6.01: Configure Modbus communication parameters (baud rate, data format, etc.).
  • Control Commands:
    • Use function code 06 to write control commands to address 2002H for inverter forward/reverse and stop control.
    • Read and write frequencies to address 2001H.
2. Reading Alarm Values
  • Use function code 03 to read alarm codes starting from address 2100H.
RMSPD INVERTER SPD990M Wiring Diagram

IV. Fault Code Meanings and Solutions

Fault CodeNamePossible CausesSolutions
E0C1Overcurrent During AccelerationToo short acceleration time, undersized inverterExtend acceleration time, choose a larger inverter
E0C2Overcurrent During DecelerationToo short deceleration time, undersized inverterExtend deceleration time, choose a larger inverter
EHU1Overvoltage During AccelerationAbnormal input voltageCheck the input power supply
ESC1Power Module FaultOutput short circuit, control board malfunctionCheck motor wiring, contact the manufacturer for service
EOL1Inverter OverloadImproper V/F curve settings, heavy loadAdjust V/F curve, choose a larger inverter

V. Conclusion

The Shanghai RMSPD INVERTER SPD990M Mini is a powerful and easy-to-use variable frequency drive. Basic start, stop, and frequency adjustment can be achieved through the panel. Terminal control enables forward/reverse operation and analog frequency adjustment. PID functionality allows for closed-loop control of water pump motors. Communication with an upper computer can be facilitated via the Modbus protocol. In the event of a fault, referring to the fault code table can quickly identify the issue and take appropriate measures. We hope this guide assists users in better utilizing and maintaining the SPD990M Inverter.

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Eppendorf ThermoMixer User Manual Guide and Fault Analysis

I. Introduction to Eppendorf ThermoMixer Functionality and Its Relationship with Eppendorf ThermoTop

thermoblock not recognized

The Eppendorf ThermoMixer is a high-performance laboratory instrument designed to provide precise temperature control and efficient sample mixing. It is widely used in various experimental fields such as molecular biology, cell culture, PCR reactions, enzymatic reactions, and bacterial culture. By simultaneously mixing and incubating samples in a metal bath, the device ensures the accuracy and reliability of experimental results.

The Eppendorf ThermoMixer is equipped with interchangeable SmartBlock heating modules that support various sizes of sample tubes and plates, offering excellent temperature homogeneity and accuracy. Additionally, the instrument is compatible with the Eppendorf ThermoTop, a heated lid with condens.protect technology that prevents condensation inside sample tubes during heating, further enhancing the stability of experimental results.

II. ThermoMixer Operating Guide

Eppendorf ThermoMixe

The Eppendorf ThermoMixer is suitable for various experimental scenarios requiring precise temperature control and sample mixing, including but not limited to:

  • Nucleic acid and protein denaturation and labeling
  • Bacterial and yeast culture
  • Lysis reactions
  • PCR reaction mixture preparation
  • Enzymatic reactions (e.g., DNA restriction enzyme digestion, protease K digestion, and ligation)
Usage Method
  1. Power-on and Setup:
    • Connect to the power supply and press the power switch.
    • Use the temperature, mixing speed, and time arrow keys to set the desired parameters.
  2. Installing the Heating Module:
    • Select the appropriate SmartBlock heating module based on experimental needs and install it on the device.
    • The device automatically recognizes the installed heating module and limits the mixing frequency to the module’s maximum value.
  3. Inserting Sample Tubes or Plates:
    • Fully insert the sample tubes or plates into the holes of the heating module.
    • If using the heated lid, ensure it is correctly installed and locked.
  4. Starting Operation:
    • Press the Start/Stop button to initiate mixing and temperature control.
    • When the set time expires, mixing will automatically stop, but temperature control will continue until the power is turned off.
  5. Special Features:
    • Short Mix: Press and hold the Short Mix button for quick mixing; release the button to stop.
    • Interval Mix: Press and hold the Interval Mix button to set intermittent mixing parameters; the device will alternate between mixing and rest phases.
Usage Process
  • During operation, various settings and adjustments can be made using the menu button and arrow keys, such as program creation, editing, and saving.
  • The device also provides multiple preset program buttons for quick selection of commonly used mixing and temperature control parameters.
NO thermoblock

III. Fault Code Meanings and Analysis for the ThermoMixer

err: Thermoblock not recognized
  • Meaning: The device fails to recognize the installed heating module.
  • Possible Causes:
    • Incompatible or damaged heating module.
    • Heating module not properly installed or poor contact.
    • Dirt or damage on the interface between the device and the heating module.
  • Solutions:
    • Check if the heating module is compatible and undamaged.
    • Reinstall the heating module to ensure proper contact.
    • Clean the interface between the device and the heating module to remove any dirt or damage.
error: No thermoblock!
  • Meaning: The device detects that no heating module is installed.
  • Possible Causes:
    • Heating module not installed.
    • Heating module installed incorrectly or loosely.
  • Solutions:
    • Install a suitable heating module and ensure it is securely locked in place on the device.
    • Check the installation of the heating module to ensure it is firmly attached.

IV. Conclusion

The Eppendorf ThermoMixer is a powerful and easy-to-use laboratory instrument that provides precise temperature control and efficient sample mixing to meet various experimental needs. When used in conjunction with the Eppendorf ThermoTop, it can further enhance the stability and reliability of experimental results. Users should strictly follow the instructions in the user manual during operation and pay attention to the maintenance and care of the device. In case of faults, users should promptly refer to the fault analysis and solutions in the user manual or contact technical support for assistance.

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Schneider ATV303 Series Inverter User Guide and F014 Fault Resolution Method

I. Introduction to the ATV303 Series Inverter Operation Panel

The Schneider ATV303 series inverter’s operation panel (also known as the display terminal or HMI) features an intuitive interface, allowing users to easily set parameters, monitor operational status, and troubleshoot errors. The primary functions of the operation panel include:

  • Display Screen: Displays the current status, parameter values, error messages, etc., of the inverter.
  • Navigation Buttons: Used to navigate between menus and parameters, and to adjust parameter values.
  • Mode Button: Switches between “Given” (rEF), “Monitor” (MOn), and “Configuration” (ConF) modes.
  • Stop/Reset Button: Stops motor operation or resets faults under certain conditions.
  • Run Button: Starts motor operation.
ATV303 INVERTER F014 FAULT

Setting and Removing Passwords

To prevent unauthorized access, users can set a password for the inverter. Here’s how:

  1. Enter “Configuration” mode (ConF).
  2. Select the “Maintenance” menu (900-).
  3. Locate the “HMI Password” parameter (999).
  4. Enter the desired password value (range: 2-9999) and press the “Confirm” button to save.

To remove the password, simply set the “HMI Password” parameter (999) to “OFF”.

Restoring Factory Settings

To reset the inverter’s parameters to their factory defaults, follow these steps:

  1. Enter “Configuration” mode (ConF).
  2. Select the “Store/Restore Parameter Sets” menu.
  3. Set the “Factory/Restore Customer Parameter Settings” parameter (102) to “64”. The inverter will restart automatically and apply the factory settings.
Schneider inverter ATV303 control terminal wiring diagram

II. Terminal Forward/Reverse Control and External Potentiometer Speed Regulation

Terminal Forward/Reverse Control

To achieve motor forward/reverse control via the inverter’s control terminals, follow these setup and wiring steps:

  1. Parameter Settings:
    • Enter “Configuration” mode (ConF).
    • Select the “Input/Output” menu (200-).
    • Set the “Control Type” parameter (201) to “2-wire control” or “3-wire control”.
    • For “2-wire control”, configure the “2-wire Control” parameter (202), e.g., “Forward Priority”.
    • Set the “Reverse” parameter (503) to specify which logic input terminal controls reversal (e.g., LI2H for LI2 high level reversal).
  2. Wiring:
    • Connect the motor forward control terminal (e.g., LI1) to the forward control signal source.
    • Connect the motor reverse control terminal (e.g., LI2, based on parameter settings) to the reverse control signal source.
    • Ensure all control signal sources are passive dry contacts or provide appropriate level signals.

External Potentiometer Speed Regulation

To regulate inverter speed using an external potentiometer, configure the following parameters and connect the corresponding terminals:

  1. Parameter Settings:
    • Enter “Configuration” mode (ConF).
    • Select the “Control” menu (400-).
    • Set the “Given Channel 1” parameter (401) to “183” to receive speed input via analog input AI1.
    • Set the “AI1 Type” parameter (204.0) to “Voltage” or “Current” based on the external potentiometer’s output type.
    • For current output, also set the “0% AI1 Current Ratio Parameter” (204.1) and “AI1 Current Calibration Parameter 100%” (204.2).
  2. Wiring:
    • Connect the external potentiometer’s output terminal to the inverter’s analog input terminal AI1.
    • Connect the external potentiometer’s power terminals (if needed) to the inverter’s +5V and COM terminals, or provide an external power supply.

III. F014 Fault Resolution Method

F014 Fault Overview

The F014 fault indicates that one phase is missing from the inverter’s output to the motor. This fault can cause abnormal motor operation or even damage to the motor and inverter.

Mechanism of Occurrence

The primary mechanisms behind the output phase loss fault include:

  1. Loose or Poor Output Terminal Connections: Loose or poor contact between the inverter output terminals and motor connection terminals may prevent the transmission of electrical energy in one phase.
  2. Motor or Cable Faults: Internal motor winding damage or cable breaks can also lead to output phase loss.
  3. Inverter Internal Faults: Damage to power devices or control circuit faults within the inverter can cause output phase loss.

Repair Method

To resolve the F014 fault, follow these troubleshooting steps:

  1. Check Output Terminal Connections: Verify that the connections between the inverter output terminals and motor connection terminals are secure and free from loose or poor contacts.
  2. Inspect the Motor and Cable: Use a multimeter or other tool to check the continuity of the motor windings and cables, ensuring there are no breaks or shorts.
  3. Examine the Inverter Internals: If the above checks are clear, the fault may lie within the inverter. Disassemble and inspect the inverter for damaged power devices or control circuit faults, and perform necessary repairs or replacements.
  4. Re-execute Autotuning: After ruling out hardware faults, re-execute the inverter’s autotuning process to ensure correct parameter settings and normal motor operation.

By following these steps, users can effectively resolve the F014 fault on the ATV303 series inverter and restore normal device operation. Regular inspections and maintenance of the inverter are recommended to prevent similar faults from occurring.

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Huayuan Inverter User Manual Usage Guide and ERR02 Fault Solution

I. Introduction to the Function of Huayuan Inverter G1 Series Operating Panel (Keyboard)

Function diagram of Huayuan inverter keyboard

Operating Panel Functionality

The Huayuan Inverter G1 Series operating panel integrates multiple functions to facilitate parameter setting, status monitoring, and fault diagnosis. The panel primarily consists of a 5-digit 8-segment LED display, 4 indicator lights, 8 buttons, and a rotary potentiometer.

  • LED Display: Shows output frequency, current, various parameter settings, and abnormal statuses.
  • Indicator Lights: Indicate the current operating mode (e.g., Hz, A, V).
  • Button Functions:
    • Rotary Potentiometer: Used to adjust numerical settings; clockwise rotation increases the value, while counterclockwise rotation decreases it.
    • Multifunction Button: Can be set to invalid, jog, or forward/reverse functions.
    • Program Button: Enters or exits the parameter menu.
    • Confirm Button: Enters the parameter menu and confirms current modifications.
    • Shift Button: Switches between running status monitoring data and shifts parameters during modification.
    • Run Button: Controls the start and stop of the inverter.
    • Stop/Reset Button: Stops the inverter or resets faults.
    • Up/Down Buttons: Increases or decreases function codes or values.
Huayuan Inverter G1 Series Wiring Diagram

Parameter Upload and Download

  • Parameter Upload: Copies the internal parameters of the inverter to the keyboard memory. Set function parameter P07.02=H.#1, press the “‖” button to start the upload, and “CoPy” will be displayed upon completion.
  • Parameter Download: Writes the parameters stored in the keyboard to the inverter. Set function parameter P07.02 to H.12 or H.13, press the “‖” button to start the download, and “LoAd” will be displayed upon completion.

Setting Open-Loop Vector Control (SVC) and Closed-Loop Vector Control (FVC) Modes

  • Open-Loop Vector Control (SVC):
    1. Set P00.00=1.
    2. Set motor parameters (P02.01~P02.05) according to the motor nameplate.
    3. Perform motor parameter tuning (P00.25=1 for static tuning, P00.25=2 for dynamic tuning).
  • Closed-Loop Vector Control (FVC):
    1. Set P00.00=2.
    2. Set motor parameters (P02.01~P02.05) according to the motor nameplate.
    3. Set encoder-related parameters (e.g., P20.00 sets the encoder line count, P20.02 enables the PG card encoder function).
    4. Perform motor parameter tuning (P00.25=1 for static tuning, P00.25=2 for dynamic tuning).

Initializing Parameters

  • By setting function parameter P00.26, you can choose to restore factory default parameters (excluding or including motor parameters).

II. External Terminal Control

Achieving Forward/Reverse Rotation and Potentiometer Speed Adjustment

Terminal Connections

  • Forward/Reverse Control:
    • For forward rotation, connect the DI1 terminal to the common terminal (COM).
    • For reverse rotation, connect the DI2 terminal to the common terminal (COM).
  • Potentiometer Speed Adjustment:
    • Connect the output end of the external potentiometer to AI1 or AI2, and the other end to the common terminal (COM).

Parameter Settings

  • Forward/Reverse Parameters:
    • Set P05.00 (DI1 function) = 1 (forward rotation) or 2 (reverse rotation).
    • Ensure P00.01 (command source selection) = 0 (keyboard control) or change it to 1 (terminal control) as needed.
  • Potentiometer Speed Adjustment Parameters:
    • Set P00.02 (main frequency source X selection) = 1 (AI1) or select other analog inputs as needed.
    • Ensure P05.59 (AI voltage or current selection) is set correctly (e.g., 00 indicates AI1 is a voltage input).
err02 fault

III. ERR02 Fault Solution

Meaning of ERR02 Fault

ERR02 indicates an “acceleration overcurrent fault,” meaning an overcurrent is detected during inverter acceleration.

Fault Causes and Solutions

  1. Grounding or Short Circuit in Inverter Output Circuit:
    • Check and eliminate grounding or short circuits in peripheral wiring.
  2. Vector Control Mode Without Parameter Tuning:
    • Ensure motor parameter tuning has been correctly performed (SVC or FVC mode).
  3. Too Short Acceleration Time:
    • Increase the acceleration time (P00.17 or P00.18).
  4. Inappropriate Manual Torque Boost or V/F Curve:
    • Adjust the manual torque boost (P04.01) or select an appropriate V/F curve (P04.00).
  5. Low Voltage:
    • Adjust the voltage to the normal range.
  6. Starting a Rotating Motor:
    • Choose speed tracking start or wait for the motor to stop before starting.
  7. Sudden Load Increase During Acceleration:
    • Eliminate sudden load increases or reassess the load condition.
  8. Undersized Inverter Selection:
    • Select an inverter with a higher power rating.

Repairing the Inverter

If the above methods cannot resolve the ERR02 fault, further inspection and repair of the inverter may be necessary:

  1. Check the Drive Board and Main Control Board:
    • Confirm that the drive board and main control board are functioning normally, and replace faulty components if necessary.
  2. Check the Hall Sensor:
    • Confirm that the Hall sensor is operating correctly, and replace it if damaged.
  3. Contact the Manufacturer or Professional Repair Service:
    • If the problem persists, it is recommended to contact the inverter manufacturer or a professional repair service for further inspection and repair.

Conclusion

The Huayuan Inverter G1 Series user manual provides a detailed operation guide and fault solution. By correctly setting parameters and using external terminal control, various functions of the inverter can be realized. For the ERR02 fault, the inverter can be restored to normal operation by troubleshooting and solving the problem step by step. When necessary, contacting the manufacturer or a professional repair service is crucial to ensuring reliable operation of the equipment.

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YQ3000-F11 User Guide and PID Function Application for Constant Pressure Water Supply of Yuqiang Inverter

The YQ3000-F11 inverter from Yuqiang, with its high performance and reliable stability, is widely used in various industrial automation applications. This article will provide a detailed introduction to the panel startup and speed adjustment methods, how to restore factory default settings, specific wiring and parameter settings for terminal forward/reverse rotation and external potentiometer speed adjustment, as well as the steps to implement PID function for single-loop closed-loop pressure control on a single-pump constant pressure water supply system. Additionally, fault code meanings and solutions will be provided.

I. Panel Startup and Speed Adjustment Methods

The YQ3000-F11 inverter from Yuqiang features an intuitive control panel, allowing users to set and adjust inverter parameters via buttons or knobs on the panel. Specific operation steps are as follows:

  1. Pre-startup Preparation: Close the air switch, observe whether there are abnormal displays on the inverter keyboard display, listen for any unusual sounds or vibrations within the inverter, and check for any unusual odors.
  2. Parameter Setting: According to the rated power and operating conditions of the motor, set the inverter’s maximum output frequency, start frequency, acceleration time, deceleration time, and other parameters via the control panel to ensure smooth and reliable inverter operation.
  3. Startup and Speed Adjustment: Set the inverter’s startup mode to manual or automatic. In automatic mode, the inverter will automatically start the motor based on preset parameters. After the motor starts, the speed can be adjusted via speed adjustment buttons or knobs on the control panel. The speed adjustment method may vary depending on the inverter model and display interface.
On site pressure gauge indication

II. Method to Restore Factory Default Settings

When the inverter settings are incorrect or a reset is needed, the parameters can be restored to factory defaults through the following two methods:

  1. Method 1: While the inverter is powered off, press and hold three combination keys simultaneously. Then, turn on the inverter power switch. Release the keys shortly after, and the inverter will restore its factory parameters.
  2. Method 2: Follow specific operating steps via the panel control to select the mode, switch parameters, and then press and hold the SET key to restore factory defaults.
Pressure feedback signal wiring

III. Specific Wiring and Parameter Settings for Terminal Forward/Reverse Rotation and External Potentiometer Speed Adjustment

The YQ3000-F11 inverter from Yuqiang supports motor forward/reverse rotation and external potentiometer speed adjustment via terminals. Specific wiring and parameter settings are as follows:

  1. Forward/Reverse Wiring:
    • Connect the positive and negative terminals of the motor to the corresponding terminals on the inverter according to the terminal wiring diagram.
    • Set the forward/reverse parameters (e.g., P001) as needed, enabling the inverter to achieve motor forward/reverse rotation based on control signals.
  2. External Potentiometer Speed Adjustment Wiring:
    • Connect the output terminal of the external potentiometer to the AI1 (or other adjustable input terminal) of the inverter.
    • Set AI1 as the speed reference input channel in the inverter parameters and adjust related parameters (e.g., P006) to achieve potentiometer speed adjustment.

IV. PID Function Application Method for Constant Pressure Water Supply

On a single-pump constant pressure water supply system, the YQ3000-F11 inverter from Yuqiang can achieve single-loop closed-loop pressure control via the PID function. Specific steps are as follows:

  1. Wiring:
    • Connect the output terminals of the pressure sensor (+10V, GND, and VF) to the corresponding control terminals of the inverter (e.g., AI1).
  2. Parameter Setting:
    • Set P006=7 to select AI1 as the PID feedback input channel.
    • Set P0902=0 to enable the PID function.
    • Set PID parameters (e.g., proportional gain P, integral time I, derivative time D) as needed to achieve stable pressure control.
    • Set the PID setpoint, which is the target pressure value. This is typically done by entering a specific numerical value in the inverter’s parameter settings.
  3. Debugging:
    • During initial debugging, the proportional gain P can be preset to an intermediate to large value or temporarily left at the factory default.
    • If the controlled physical quantity (i.e., pressure) oscillates near the target value, increase the integral time I. If oscillation persists, appropriately decrease the proportional gain P.
    • If the controlled physical quantity is difficult to recover after changing, increase the proportional gain P. If recovery is still slow, appropriately decrease the integral time I or increase the derivative time D.

V. Fault Code Meanings and Solutions

When using the YQ3000-F11 inverter from Yuqiang, various fault codes may be encountered. These codes are usually displayed on the inverter’s display screen to help users quickly locate issues. Below are some common fault codes and their solutions:

  1. OC (Overcurrent):
    • Cause: Excessive motor load, improper inverter parameter settings, etc.
    • Solution: Check motor load, adjust inverter parameters, optimize motor matching, etc.
  2. OV (Overvoltage):
    • Cause: Excessively high input voltage, internal inverter faults, etc.
    • Solution: Check input voltage stability, replace the inverter, etc.
  3. OL (Overload):
    • Cause: Motor overload, poor heat dissipation, etc.
    • Solution: Check motor load, improve heat dissipation conditions, etc.
  4. OH (Overheat):
    • Cause: Poor inverter heat dissipation, excessively high ambient temperature, etc.
    • Solution: Improve heat dissipation conditions, reduce ambient temperature, etc.

In conclusion, the YQ3000-F11 inverter from Yuqiang boasts powerful functions and a wide range of applications. Through reasonable parameter settings and wiring methods, precise motor speed adjustment and stable control of constant pressure water supply systems can be achieved. At the same time, familiarity with fault code meanings and solutions also aids users in better maintaining and using the inverter.

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KCINT Inverter KC280/KC300 Series User Guide and Realization Method of Constant Pressure Water Supply Control

I. KCINT Inverter KC280/KC300 Series User Guide

1. Terminal Panel Start and Speed Regulation Method

The KCINT Inverter KC280/KC300 series can be started and speed-regulated through the terminal panel. Specific operations are as follows:

KCINT IVERTER connects motor terminals
  • Wiring Instructions:
    • Connect the three-phase power supply to the R, S, T terminals of the inverter.
    • Connect the U, V, W terminals of the motor to the U, V, W output terminals of the inverter.
    • Connect the ground wire to the PE terminal of the inverter.
  • Parameter Settings:
    • Set P0.01 to 0 to select the keyboard command channel.
    • Set P0.03 to 0 to select the keyboard setting mode.
    • Set P0.07 to the desired operating frequency.
  • Operation Method:
    • Press the RUN button to start the inverter.
    • Hold the ▲ button to increase the output frequency of the inverter; hold the ▼ button to decrease the output frequency.
    • Press the STOP button to stop the inverter.
KCINT IVERTER connects the pressure sensor signal wire terminal

2. Terminal Forward/Reverse and External Potentiometer Speed Regulation Method

  • Wiring Instructions:
    • Connect the three-phase power supply to the R, S, T terminals of the inverter.
    • Connect the U, V, W terminals of the motor to the U, V, W output terminals of the inverter.
    • Connect the ground wire to the PE terminal of the inverter.
    • Connect the output terminal of the external potentiometer to the VI terminal of the inverter, and the common terminal to the GND terminal.
    • Connect the forward control terminal FWD-COM to the forward control signal, and the reverse control terminal REV-COM to the reverse control signal.
  • Parameter Settings:
    • Set P0.00 to 1 to select the input terminal control mode.
    • Set P0.01 to 1 to select the terminal command channel.
    • Set P0.03 to 1 to select the analog VI setting mode.
    • Set P5.07 to 0 to select the two-wire control mode.
  • Operation Method:
    • When only FWD-COM is closed, the motor rotates forward; when only REV-COM is closed, the motor rotates reverse; when both are closed or open, the motor decelerates and stops.
    • Adjust the external potentiometer to change the output frequency of the inverter, thereby achieving speed regulation.
KCINT IVERTER physical item

II. Closed-Loop PID Control Application in Constant Pressure Water Supply

1. Parameter Settings

  • Set P0.03 to 5 to select the PID control setting mode.
  • Set P0.13 to 3 to select the constant pressure water supply macro function.
  • Set P9.00 to 0 to select the keyboard preset PID setting.
  • Set P9.01 to the desired PID setpoint (relative value, 0~100%).
  • Set P9.02 to 0 to select the analog channel VI feedback.
  • Adjust PID parameters such as P9.04 (proportional gain), P9.05 (integral time), and P9.06 (derivative time) as needed to achieve the desired control effect.

2. Wiring Instructions

  • Connect the output terminal of the remote pressure gauge or 4-20mA pressure transmitter to the VI terminal of the inverter, and the common terminal to the GND terminal.
  • Correctly connect the power wire and signal wire according to the wiring requirements of the pressure gauge or transmitter.

3. Operation Method

  • After starting the inverter, adjust the PID setpoint (A value) through the panel’s up and down keys.
  • The system will automatically adjust the output frequency of the inverter based on the set PID parameters and feedback signals to maintain a constant water supply pressure.
KCINT IVERTER working pictures

III. Fault Code Analysis and Solutions

The KCINT Inverter KC280/KC300 series may display various fault codes during operation. The following are some common fault codes, their analyses, and solutions:

  • FL (Inverter Unit Fault):
    • Possible Causes: Too fast acceleration, internal IGBT damage, interference causing malfunctions, poor grounding, etc.
    • Solutions: Increase acceleration time, check and eliminate interference sources, check grounding, etc.
  • OC (Overcurrent Fault):
    • Possible Causes: Too fast acceleration or deceleration, large load inertia torque, low grid voltage, insufficient inverter power, etc.
    • Solutions: Increase acceleration or deceleration time, select a larger inverter, check grid voltage, etc.
  • OU (Overvoltage Fault):
    • Possible Causes: Abnormal input voltage, too fast deceleration, large load inertia, etc.
    • Solutions: Check the input power supply, increase the deceleration time, add suitable energy consumption braking components, etc.
  • LU (Bus Undervoltage Fault):
    • Possible Cause: Low grid voltage.
    • Solution: Check the grid input power supply.
  • OL (Overload Fault):
    • Possible Causes: Low grid voltage, incorrect motor rated current setting, motor stall or excessive load mutation, etc.
    • Solutions: Check the grid voltage, reset the motor rated current, check the load, etc.

When using the KCINT Inverter KC280/KC300 series, wiring and parameter settings should be strictly carried out according to the manual, and regular maintenance and servicing of the inverter should be performed to ensure its normal operation and extend its service life. At the same time, for fault codes that appear, the cause should be promptly analyzed and corresponding solutions taken to ensure the smooth progress of the production process.