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How to deal with inverter overcurrent fault?

How to deal with inverter overcurrent fault?

When the output current is higher than a certain threshold, in order to protect the inverter, the inverter will report an overcurrent fault. The frequency converter also immediately blocks the pulse output, which is an important way to protect the drive from damage. This fault cannot be blocked.

There are many reasons for the overcurrent fault of the inverter, and it should be analyzed according to the actual situation. If you find the right source, and then the right method, you can generally solve it. When the motor cable is connected to the inverter and the motor, it is analyzed separately from the inverter side and the motor side.

1. First of all, the influence of the inverter side

Common causes of inverter overcurrent on the inverter side are:

The acceleration time is too short. The larger the motor torque required at this time, the torque is proportional to the current, so the current is also large, and the acceleration time can be appropriately extended.

Improve function. If the voltage rises too high during the V/f control during startup, it may cause overcurrent. The voltage boost value can be appropriately reduced.

The PID parameters are not suitable. The excessive dynamic response may cause overcurrent. The filter time should be extended, minus P plus I.

2. Secondly, the influence of the motor side

Common causes of overcurrent in the inverter on the motor side are:

The motor cable is shorted to ground. The cable is not well insulated and has broken skin. The cable insulation can be tested with a shaker to confirm the cable quality.

The motor is blocked. In this case, the inverter will try to use a larger torque to make the motor rotate, which may cause an overcurrent fault.

3. Finally, the hardware problem

If the current detection mechanism inside the inverter is not working properly, or if there is a problem with the CPU processing mechanism, these are not solved by setting parameters and need to be repaired.

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