INVT GD270 OC2 – Overcurrent during DEC

Diagnostic context

What OC2 means on INVT GD270

OC2 identifies an overcurrent condition while the GD270 is decelerating the motor. Although the manufacturer table shares troubleshooting items with the related overcurrent faults, OC2 is specifically distinguished by the operating phase in which the fault occurs.

Operating context: The fault occurs during deceleration. Review the listed electrical, load and wiring checks with particular attention to conditions while motor speed is being reduced.

This diagnostic context is an editorial explanation. The possible causes and recommended checks below are the verified manufacturer troubleshooting content.

Possible causes

ACC/DEC too fast.
Grid voltage too low.
VFD power too small.
Load transient or exception occurred.
To-ground short circuit or output phase loss occurred.
Strong external interference sources.
The overcurrent stall protection is not enabled.

Recommended checks and actions

Increase ACC/DEC time.
Check the input power.
Select a VFD with larger power.
Check whether the load is short circuited (to-ground short circuit or line-to-line short circuit) or the rotation is not smooth.
Check the output wiring.
Check whether there is strong interference.
Check the settings of related function codes.

Technical source

INVT GD270 Manual EN - Fault OC2 — page 277