Overcurrent Trip

What does Overcurrent mean?

An excessive current flow has been detected at the drive's output. This is typically caused by a short circuit or ground fault on the output side, an extremely heavy mechanical load, overly short acceleration/deceleration times, incorrect motor data, or switching a magnetic contactor at the output. This condition can severely damage the drive's power section (IGBTs).

• Short circuit between two output phases (U, V, W) or a ground fault on the drive's output wiring or motor windings.
• Excessively heavy mechanical load on the motor, causing the motor to draw current beyond the drive's instantaneous overcurrent threshold.
• Acceleration time (Parameter C1-01) or deceleration time (Parameter C1-02) is set too short for the inertia of the connected load.
• Motor stalled due to mechanical binding or blockage in the driven equipment.
• Drive output current limit (Parameter C2-01) is set too low for the application's peak current demands.

Click steps to track your progress.

1. 1

   1. De-energize the drive and disconnect the motor; perform an insulation resistance test (megohmmeter) on each output phase (U, V, W) to ground and between phases to check for short circuits.

2. 2

   2. Check for mechanical binding or obstruction in the driven load that could be causing excessive torque requirements.

3. 3

   3. Increase the acceleration time (Parameter C1-01) and deceleration time (Parameter C1-02) by 20% increments.

4. 4

   4. Verify motor nameplate current against the drive's rated output current to ensure proper sizing.

5. 5

   5. Monitor drive output current (via display or software) during start-up to identify when the overcurrent condition occurs relative to motor speed.

6. 6

   6. Adjust the drive's current limit (Parameter C2-01) if necessary, ensuring it remains within safe operating limits for the motor and drive.