When Yaskawa inverter overload (OL) failure occurs, the following steps can be taken to deal with it:
1. Confirm the overload type and cause
The overload fault of Yaskawa inverter may include OL1 motor overload, OL2 inverter overload, OL3 overmoment detection 1, OL4 overmoment detection 2 and other types. These failures are usually caused by:
Excessive load: The selected motor and inverter cannot drag the load, resulting in overload.
Improper acceleration time setting: the acceleration time setting is too short, causing the motor to withstand too much current in a short time.
Brake problem: The brake does not open or the control signal is abnormal, resulting in the motor cannot operate normally.
Parameter setting error: For example, the V/F curve is set improperly or the motor parameters are set incorrectly, resulting in abnormal motor operation.
2. Troubleshoot the fault
Check the load:
Confirm whether the load is too large, whether it exceeds the carrying capacity of the motor and frequency converter.
If the load is too large, it is necessary to reduce the load or increase the frequency converter capacity.
Adjust the acceleration time:
Check the acceleration and deceleration time Settings of the inverter to ensure that the acceleration time is not short.
Appropriate extension of the acceleration time to reduce the motor in the starting process to withstand the current impact.
Check the brake:
Verify that the brake has been opened and that the control signal is normal.
If the brake does not open or the control signal is abnormal, it is necessary to check the control circuit and PLC signal of the brake.
Check parameter Settings:
Check the parameter Settings of the inverter to ensure that the V/F curve and motor parameters are set correctly.
If the parameter Settings are incorrect, you need to adjust the parameters.
Check encoders and connections:
For closed loop control systems, it is necessary to check whether the connection between the PG card and the encoder is normal.
Confirm whether there is interference, and whether there is a problem with the cable shielding line.
Check the output side:
Check whether the output side is faulty, such as short circuit or grounding.
Check whether the output transistor is damaged, which can be judged by measuring the resistance value of each phase.
3. Fault prevention measures
Regular maintenance: Regular maintenance of the inverter, including cleaning the radiator and checking the operation of the fan.
Select the right motor and frequency converter: Select the right motor and frequency converter according to the load situation to avoid the occurrence of overload phenomenon.
Reasonable setting of parameters: according to the actual situation of the motor, set the parameters of the inverter reasonably to ensure the normal operation of the motor.
Pay attention to the operating environment: ensure that the operating environment of the inverter is suitable to avoid the influence of adverse factors such as high temperature and humidity on the inverter.
4. Maintenance and replacement
Maintenance: If the inverter fails and cannot be solved by itself, it is recommended to contact the manufacturer or professional maintenance personnel for testing and maintenance.
Replacement: If the frequency converter is seriously damaged or the maintenance cost is too high, it is recommended to replace the new frequency converter