Motor Overcurrent

Hva betyr OCF ?

The motor is drawing current that exceeds its rated capacity, indicating an excessive load, mechanical binding, or an electrical issue. This condition can lead to motor overheating and premature failure.

• Excessive mechanical load on the motor (e.g., jammed conveyor, seized pump bearing, clogged process).
• Incorrect motor parameters entered into the soft starter (e.g., P1-01 (Motor Rated Current) set too low compared to actual motor FLA).
• Short circuit or ground fault in the motor windings or motor cable (often precedes a GrdF fault).
• Mechanical binding in the driven equipment causing unusually high starting torque demand.
• Motor winding fault (e.g., turn-to-turn short) increasing current draw without immediately grounding.

Klikk på steg for å spore fremgangen.

1. 1

   1. Measure actual motor current on all three phases (U, V, W) using a clamp-on ammeter during operation and compare to the soft starter display (e.g., F1-01).

2. 2

   2. Verify that the motor rated current parameter (P1-01) in the soft starter matches the motor nameplate FLA (Full Load Amps).

3. 3

   3. Disconnect motor from the driven equipment (if possible) and run the motor no-load to check for mechanical binding in motor bearings.

4. 4

   4. Manually check for mechanical freedom of the driven load (e.g., rotate shaft by hand, inspect for obstructions).

5. 5

   5. Perform a resistance check of motor windings (phase-to-phase) using a multimeter; compare readings for symmetry and against motor data.

6. 6

   6. Increase the soft starter's current limit parameter (e.g., P2-01) if initial current spikes are tripping the unit, ensuring it remains below motor/cable ratings.