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What can cause the ATV61 or ATV71 drive to fail the auto diagnostics transistor test showing ok, open, ok, open on all of the transistors in the test?

FA248982

28 September 2021

Issue:
ATV61 or ATV71 possible causes for a fail in the auto diagnostics transistor test showing ok.

Product Line:
Altivar ATV61 and ATV71

Environment:
All

Cause:
They run the Auto diagnostics test and the drive fails showing ok open ok open on all of the tested IGBTs.

Resolution:
The motor may not be connected to the drive when you start the test.  Make sure the motor is connected to the motor with no disconnect between the motor and drive before starting the test.