1. Pinout of the 80-pin S87C196MH (MC) microcontroller in SMD package: 2. Introduction to the structure and functions of the S87C196MH (MC) microcontroller: The controller is a 16-bit microcontroller produced by Intel. It is widely used in inverter products due to its powerful functions and high versatility. The internal circuit includes arithmetic logic unit (RLU), registers, internal A/D converter, PWM…
Month: July 2024
A quick inspection method for PLC control circuits
A set of hydraulic processing equipment in a factory suddenly broke down. A solenoid valve could not be powered, causing the hydraulic system to not work properly. After receiving a notice from the user requesting on-site maintenance, an intern from a mechanical and electrical technical school and an undergraduate majoring in automation set out to do the work. The hydraulic…
Alpha ALPHA2000 inverter circuit schematic and maintenance analysis
1.《Alpha ALPHA2000 18.5kW inverter》Switching power supply circuit diagram The 530V power supply of the switching power supply is introduced from the CNPN terminal. The P terminal is added to the drain of the switching tube K2225 through the main winding of the switching transformer, and then to the N terminal through the emitter current sampling resistor, forming the input power…
the control terminal circuit of Inverter CPU motherboard
1. Digital control terminal circuit: The operation control terminal of the frequency converter receives, outputs and processes two types of signals: digital and analog. Analog signals are generally used to input frequency instructions of 0-5V (10V) to determine the output speed of the frequency converter; output analog voltage signals corresponding to the output (given) frequency for external frequency meters to…
Function diagram of common IC pins in inverter circuits
illustrate: From the perspective of application maintenance, it is enough to master the pin functions of some IC devices, so as to measure the voltage (level) status of some pins and judge whether the IC is in normal working condition. It is too late and unnecessary to care about what kind of circuit is inside the IC. For example, for…
616G3-55kW Yaskawa inverter main circuit diagram and inverter maintenance ideas
1. Main circuit of “616G3-55kW Yaskawa inverter” The structures of the main circuits of all inverters are similar or even identical. The main circuits of Yaskawa inverters and Taiwan Teco inverters are exactly the same. Later I observed that the control panels of the two machines are the same, and the control panel and parameter settings are also similar. It…
Debugging ideas and methods of Siemens G120 VFD PM240
As an important part of Siemens automation solutions, Siemens G120 series inverters are designed for high-performance applications. This series of inverters not only supports a wide range of motor types (including asynchronous motors, synchronous motors and servo motors), but also has excellent dynamic response capabilities and a rich set of functions, which can meet various needs from simple speed control…
Maintenance Method of Basic Circuit of VFD CPU Board
1. What is CPU? CPU, also known as central processing unit, is generally composed of arithmetic unit, controller, internal memory, input/output device, interface circuit and bus. However, with the advancement and update of technology, its functions and structure are constantly expanding – the original CPU peripheral circuit is also integrated into the device. When its hardware equipment is expanded to…
Analysis of 3 types of VFD motherboard wiring terminal signal source drawings
If you frequently repair a certain brand or several brands of inverters, you should have the terminal diagram of the connection cable between the CPU motherboard and the power/driver board. With it, the maintenance efficiency will be greatly improved. I spent a lot of effort to survey and map the terminal diagrams of the CPU motherboards of three inverters. I…