Introduction
The Saisi SES800 series servo driver is a liquid-cooled servo driver specifically designed for injection molding machines. It features high efficiency, stability, and energy saving, and is widely used in the hydraulic systems of injection molding machines. This article will provide a detailed introduction to the wiring, commissioning, and maintenance of the SES800 servo in injection molding machines, helping users to better operate and maintain this equipment.
I. Wiring Guide
1.1 Main Circuit Wiring
The main circuit wiring of the SES800 servo driver includes three-phase AC power input and three-phase AC motor output. The specific wiring steps are as follows:
- Power Input: Connect the three-phase AC power supply (380V-480V, 50/60Hz) to the R/L1, S/L2, and T/L3 terminals of the driver.
- Motor Output: Connect the U/T1, V/T2, and W/T3 terminals of the driver to the three-phase motor of the hydraulic pump of the injection molding machine.
- Grounding: Ensure that the PE terminal of the driver is reliably grounded to prevent electric shock and interference.
1.2 Control Circuit Wiring
The control circuit wiring includes analog signal input/output, digital signal input/output, and communication interface. The specific wiring steps are as follows:
- Analog Signal Input: Connect the feedback signal of the pressure sensor to the A11 terminal, the flow setpoint signal to the A12 terminal, and the pressure setpoint signal to the A13 terminal.
- Digital Signal Input: Connect the operation commands, fault reset signals, etc., of the injection molding machine to the X1-X8 terminals.
- Digital Signal Output: Connect the running status, fault alarm signals, etc., of the driver to the Y1-Y2 terminals.
- Communication Interface: Connect the CAN communication interface to the CANH and CANL terminals for communication with the host computer or other drivers.
1.3 Braking Resistor Wiring
For applications requiring dynamic braking, an external braking resistor is required. Connect the braking resistor to the +DC/B1 and B2 terminals of the driver, and ensure that the wiring length does not exceed 5 meters. If it exceeds 5 meters, use twisted pair wiring.
II. Commissioning Guide
2.1 Motor Test Run
Before formal commissioning, a motor test run is required to ensure that the motor and driver are functioning normally. The specific steps are as follows:
- Motor Parameter Setting: Set the P03 group function codes according to the motor nameplate parameters, including the motor’s rated power, rated voltage, rated current, rated frequency, and rated speed.
- Initial Angle Tuning: Set P03.24=1 or 2, and run the motor to perform synchronous machine angle tuning. After tuning is complete, the initial angle is saved in P03.26 and P03.27.
- Normal Operation: Power off and then power on the driver, run the motor, observe the motor operation, and adjust the speed loop and current loop PI parameters to ensure stable motor operation at both high and low speeds.
2.2 Servo Oil Pump Commissioning
Servo oil pump commissioning is a critical step in the commissioning of injection molding machines. The specific steps are as follows:
- Oil Pressure Control Mode Selection: Set the P14.00 function code according to actual needs to select the oil pressure control mode.
- Servo Oil Pump Selection Parameter Setting: Set P25.01 (pressure sensor range) and P25.02 (pressure sensor output signal mode) according to the pressure sensor specifications, and set P25.03 according to the maximum pressure required by the system.
- Pressure Setpoint Curve Calibration: Set different pressure values on the computer in sequence, observe the P01.22 value of the driver parameters, and set the corresponding percentage values into the function codes P10.32-P10.64.
- Flow Setpoint Curve Calibration: Set different flow values on the computer in sequence, observe the P01.21 value of the driver parameters, and set the corresponding percentage values into the function codes P10.10-P10.28.
- AI Zero Drift Automatic Calibration: Set P10.75 to “1”, and the driver will perform an AI zero drift automatic calibration operation.
- Bottom Pressure, Bottom Flow, and Pressure Relief Setting: Set P25.06 (bottom pressure) and P25.07 (bottom flow) according to actual needs, and adjust P01.42 (pressure command) and P01.44 (flow command) to achieve the required values.
- Oil Pressure PID Control: Adjust the P14.02-P14.07 function codes according to actual needs, set the proportional gain (Kp), integral gain (Ki), and derivative gain (Kd) to ensure a fast and stable system response.
III. Maintenance and Repair Guide
3.1 Routine Maintenance
- Environment Check: Ensure that the driver is installed in a well-ventilated, dust-free, and corrosion-free gas environment, with an ambient temperature range of -10℃ to 40℃.
- Wiring Check: Regularly check the wiring of the main circuit and control circuit to ensure that the wiring is secure and free of looseness.
- Cooling Check: Regularly clean the heat sink and fan of the driver to ensure good cooling and prevent overheating.
3.2 Fault Diagnosis and Repair
The SES800 servo driver has a comprehensive fault diagnosis function, allowing users to view fault codes through the operation panel and take corresponding actions based on the fault codes. Common faults and their solutions are as follows:
- Overcurrent Fault (Er.oC1, Er.oC2, Er.oC3): Check if the motor parameters are set correctly, extend the acceleration/deceleration time, and check the encoder and its wiring.
- Overvoltage Fault (Er.oU1, Er.oU2, Er.oU3): Check the input power supply voltage, extend the acceleration/deceleration time, and install an input reactor.
- Overheat Fault (Er.oH1, Er.oH2): Clean the air ducts, replace the fan, and lower the ambient temperature.
- Overload Fault (Er.oL1, Er.oL2): Check the load condition, re-perform motor parameter self-tuning, and select a driver with a higher power rating.
- Communication Fault (Er.SC1): Check the communication wiring, appropriately set the baud rate, and check the working status of the host computer.
3.3 Warranty and Service
The Saisi SES800 servo driver comes with an 18-month warranty period. During the warranty period, faults caused by product quality issues can be repaired or replaced free of charge. If users encounter any problems during use, they can promptly contact the product supplier or Megmeet Drive Technology Co., Ltd. for technical support and service.
Conclusion
The Saisi SES800 servo driver is a high-performance, high-reliability servo driver specifically designed for injection molding machines. Through proper wiring, commissioning, and maintenance, its stable operation in injection molding machines can be ensured. It is hoped that this user guide will help users better operate and maintain the SES800 servo driver, improving production efficiency and equipment lifespan.