40 ACS 400 User’s Manual
Troubleshooting Guide
This section consists of a series of flowcharts to help determine the necessary corrective action for
eight common problems that may occur during start-up of your ACS 400 drive.
• motor will not run, see page 41
• motor stalls during acceleration, see page 42
• overvoltage fault indication, see page 43
• overcurrent fault indication, see page 44
• overload fault indication, see page 45
• undervoltage fault indication, see page 46
• external fault indication, see page 47
• no operator panel display, see page 48
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