SW OverCurrent

What does 36 mean?

The drive output current has exceeded its 1 ms software current rating, which is a very fast-acting protection mechanism. This rating is typically between 200-250% of the drive's continuous rating and less than the hardware overcurrent level. This fault indicates a severe and rapid transient overload or a hard short circuit on the motor output terminals, protecting the drive's output stage from immediate damage.

• Extremely rapid load change or mechanical shock causing an instantaneous current spike.
• Phase-to-phase or phase-to-ground short circuit in the motor windings or motor cable.
• Motor stator insulation breakdown causing an abrupt current draw.
• Motor current sensing hardware or software malfunction within the drive.
• Oversized motor with respect to the drive, or motor data mismatch (P2-xx) resulting in poor control.

Click steps to track your progress.

1. 1

   1. Perform a motor and cable insulation resistance test (megohmmeter, e.g., 1000VDC) from drive output terminals (U, V, W) to ground and phase-to-phase.

2. 2

   2. Verify that all motor nameplate parameters (P2-01 to P2-05) are accurately entered into the drive.

3. 3

   3. Disconnect the motor from the mechanical load and run the drive with no load to isolate the motor/load from the drive.

4. 4

   4. Increase acceleration and deceleration times (e.g., P400, P401) to the maximum allowable by the application to reduce current transients.

5. 5

   5. If the fault persists with no motor or load connected, the drive itself likely has a hardware fault (e.g., current sensor, gate driver) and needs replacement.