When Yaskawa inverter overcurrent (OC) fault occurs, the following steps can be taken to solve it:
1. Rectify the fault
Check motor
Insulation resistance: Confirm that the insulation resistance of the motor is normal. If the motor burns out or the insulation ages, it may lead to abnormal current. If the insulation resistance is not qualified, the motor should be replaced.
Load: Check if the motor is stuck, if the bearing is damaged, and if there is a problem with the transmission system. Excessive load may also lead to overcurrent fault. In this case, the load needs to be reduced.
Check cable
Power cable: Check whether the power cable of the motor is damaged, and whether there is contact or ground short circuit. If any problem exists, remove the part of the grounding short circuit and check whether the resistance between the cable and the terminal is normal. If the cable is damaged, replace it with a new one.
Check the matching of inverter and motor
Capacity matching: Ensure that the rated current of the motor nameplate does not exceed the rated current of the inverter. If the motor does not match the frequency converter, the motor or frequency converter may need to be replaced.
Check the power supply voltage and frequency
Stability: Power supply voltage and frequency instability can also lead to overcurrent failure. The Settings of the power system and inverter control panel should be checked to ensure that the power supply voltage and frequency are within the specified range.
Check the inverter internal circuit
Component status: Check whether the various components of the inverter's internal circuit (such as resistors, capacitors, transistors, etc.) are working normally. If damaged, replace the corresponding component.
Check acceleration and deceleration times
Parameter setting: The torque required for acceleration is calculated by the inertia torque of the load and the acceleration time. If the torque value is improper, the acceleration and deceleration time parameter of the inverter should be adjusted to match the inertia torque of the load.
2. Troubleshoot the fault
Replace the motor or cable: If the motor or cable is damaged, replace the new motor or cable in time.
Adjust the load: If the load is too large, the load should be reduced or replaced with a larger capacity inverter.
Adjust the frequency converter parameters: according to the actual needs, adjust the frequency converter acceleration and deceleration time parameters and other related parameters.
Repair or replace the internal components of the inverter: If the internal components of the inverter are damaged, professionals should be asked to repair or replace them.
3. Preventive measures
Regular inspection: Regular inspection and maintenance of motor, cable, frequency converter and other equipment, timely detection and treatment of potential problems.
Correct operation: Operate according to the specified procedure to avoid overcurrent fault caused by misoperation.
Reasonable selection of equipment: When selecting the motor and frequency converter, it should be ensured that the capacity between them matches and meets the actual use needs.
The solution of Yaskawa inverter overcurrent (OC) fault needs to be investigated and dealt with from many aspects. During the troubleshooting process, the cause of the fault should be carefully analyzed and the corresponding solution measures should be taken. At the same time, strengthening the implementation of preventive measures can reduce the probability of failure.