Delta VFD300C43S-HS User Manual page 556

Chapter 14 Fault Codes and DescriptionsC2000-HS
Hardware failure
Check if the setting for stall
prevention is correct
The ocA occurs due to short circuit or ground fault at the output side of the drive.
Check for possible short circuits between terminals with the electric meter:
B1 corresponds to U, V, W; DC- corresponds to U, V, W;
V, W.
If short circuit occur, return to the factory for repair.
Set the stall prevention to the proper value.
14-2
corresponds to U,