Troubleshooting a VFD overvoltage fault

Troubleshooting an overvoltage fault on a drive can sometimes be tricky because the condition that creates the fault can come from the line or load side of the drive. This video will cover how to diagnosis the cause of the fault, and provide some general guidance on possible solutions to prevent the fault from occurring.
00:00 Intro
01:15 Basic VFD schematic
02:59 Maximum voltage levels
03:31 Line side overvoltage trip causes
10:57 Load side overvoltage trip causes

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May I ask one question
Why VFD using cooling water pump control panel cooling fan is short circuit often time?
thank you