OC1-Trip (Overcurrent)

What does 11 mean?

This fault indicates an overcurrent condition. For the KPS-600, it specifically signifies an I*t overload of the brake resistor during the charging phase, implying excessive energy dissipation. For KSDs, it means a power unit overcurrent, typically a short-circuit or ground fault detected by hardware monitoring, which is a critical fault risking damage to the power stage.

1. 1

   Measure the insulation resistance between motor phases U-V, V-W, U-W using a megger at 500VDC — expect >1 MΩ.

2. 2

   Measure motor current on each phase during operation and compare to motor nameplate Full Load Amperage (FLA).

3. 3

   Verify that motor parameters (e.g., nominal current, overload limits) stored in the drive match the motor nameplate.

4. 4

   Inspect the brake resistor for physical damage or signs of overheating, and measure its resistance value.