I²t overload

What does OC5 mean?

This fault indicates an I²t overload condition, meaning the motor or drive has experienced excessive current over an extended period, leading to thermal stress. By default, it triggers a full TRIP, inhibiting all ignition pulses for both armature and field circuits and resetting the Ready signal. This protective action prevents components from overheating and potential damage, requiring manual reset after the fault is cleared.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review drive parameters: Confirm acceleration/deceleration times and current limits (e.g., C022, C023) are correctly set for the application.

2. 4

   Measure motor current: Use a clamp meter to verify actual motor current under load against rated current.

3. 5

   Check for mechanical binding: Manually turn the motor shaft (if safe) to detect any binding or excessive friction in the mechanical system.