Overcurrent

What does F-01 mean?

An overcurrent condition has occurred at the inverter's output, leading to an immediate switch-off with inhibit. Possible causes include a short circuit, inappropriate motor sizing, or switching the output stage while inhibited. This fault can damage the inverter's output stage if not resolved.

• Short circuit in the motor windings or motor output cables (e.g., phase-to-phase or phase-to-ground fault).
• Motor output cable insulation breakdown due to aging, mechanical damage, or water ingress (e.g., causing flashover).
• Motor bearing seizure or severe mechanical overload causing the rotor to lock up and draw excessive current.
• Inverter IGBT failure or internal power stage fault causing excessive current draw at output terminals.
• Incorrect motor parameters (e.g., P1-01 Motor rated power) leading to drive miscalculation and premature trip.

Click steps to track your progress.

1. 1

   1. Disconnect motor cables from inverter output (U, V, W) and measure insulation resistance to ground (e.g., >10 Mohms using a megohmmeter).

2. 2

   2. Measure motor winding resistance (phase-to-phase: U-V, V-W, W-U) and compare to motor nameplate/data sheet (expect values <1 Ohm and balanced).

3. 3

   3. Inspect motor output cables for visible signs of damage, chafing, or improper termination at both motor and drive ends.

4. 4

   4. Attempt to rotate the motor shaft manually to check for mechanical binding or seizure; lubricate or repair as needed.

5. 5

   5. Reduce acceleration ramp time (P1-08) or motor boost (P1-50) if the overcurrent occurs primarily during startup phase.