Instantaneous Overcurrent Trip

What does 6 mean?

This fault indicates a short circuit has been detected, either during power-up or during normal operation. This is a critical fault indicating excessive current flow, often due to wiring issues or a faulty motor. Such a condition can severely damage the drive's power output stage if not immediately addressed.

• Phase-to-phase or phase-to-ground short circuit in the motor wiring (U, V, W terminals or motor cable).
• Damaged motor windings causing a short circuit within the motor.
• Incorrect motor parameter settings (e.g., P0-03 Motor Rated Current) leading to an underestimated current limit.
• Rapid acceleration (P0-10 Accel1 Time) with high inertia loads exceeding the drive's current capacity.
• Failure of the drive's IGBTs (Insulated Gate Bipolar Transistors) causing a short circuit on the output stage.

Click steps to track your progress.

1. 1

   1. De-energize and lock out the drive, then inspect all motor power cables (U, V, W) for insulation damage or loose connections at both drive and motor terminals.

2. 2

   2. Disconnect the motor cables from the drive, then measure the resistance between each output phase (T1/U, T2/V, T3/W) and ground at the drive terminals; resistance should be infinite.

3. 3

   3. Perform an insulation resistance test (Megger test) on the motor windings at 500VDC (phase-to-phase and phase-to-ground) to check for internal shorts.

4. 4

   4. Verify parameter P0-03 (Motor Rated Current) and P0-10 (Accel1 Time) are correctly configured for the motor and application load.

5. 5

   5. With the motor disconnected, power on the drive and confirm if the fault reoccurs. If it does not, the issue is likely with the motor or cabling.

6. 6

   6. Replace the drive unit if the fault persists with the motor disconnected and motor-side tests are conclusive.