Overcurrent

What does 1 mean?

The drive has detected an excessively high current (>4*IH) flowing in the motor cable, which can be caused by a sudden heavy load increase, a short circuit in the motor cables, or an incorrectly sized motor. This condition can lead to severe damage to the motor, cables, or the drive's internal power components if not promptly addressed.

• Sudden mechanical overload on the motor shaft exceeding the motor's rated torque.
• Short circuit between two motor phases (U, V, W) or from a motor phase to ground in the motor cable or motor windings.
• Motor rated current parameter (e.g., P7-02) set lower than the actual motor nameplate Full Load Amperes (FLA).
• Drive acceleration time parameter (e.g., P2-01) set too short for the mechanical inertia of the connected load.
• Mechanical binding or bearing failure in the driven equipment causing excessive torque demand during operation.

Click steps to track your progress.

1. 1

   Measure motor phase currents (L1, L2, L3) using a clamp meter during a start attempt, comparing against the motor nameplate FLA.

2. 2

   Isolate the motor from the drive output (U, V, W terminals) and measure the resistance between phases (U-V, V-W, W-U) and from each phase to ground using a megohmmeter (500VDC test voltage).

3. 3

   Verify drive parameter P7-02 (Motor Rated Current) against the motor nameplate Full Load Amperes (FLA).

4. 4

   Increase drive parameter P2-01 (Acceleration Time) by 25% and observe if the overcurrent fault persists during start-up.

5. 5

   Manually rotate the motor shaft and connected load (if accessible) to check for mechanical binding or obstruction.

6. 6

   Inspect the drive output terminals (U, V, W) and motor terminal box for loose connections or signs of arcing.