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What can cause an open transistor fault on the ATV66 drives?

Issue:
What can cause an open transistor fault on the ATV66 drives?

Product Line:
Altivar ATV66 and ATV56

Environment:
All

Cause:
ATV66 drive is tripping on Open transistor faults.

Resolution:
This means the drives output transistor has faulted open.  Try removing mains voltage and only apply CL1 CL2 to power up the drive. Once powered up try running the transistors test in the  auto diagnostics menu.
If any of the output transistors fail the diagnostics  test you will have to send the drive back to the depot to get it repaired or you will have to replace the drive.
 
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