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What would cause the ATV 630 or ATV930 drive to show SCF1 when you open the STO safe torque off inputs?

Issue:
What would cause the ATV630 or ATV930 drive to show SCF1 when you open the STO safe torque off inputs?

Product Line:
ATV630 and ATV930 drive

Environment:
All 

Cause:
Firmware issue triggering the SCF1 fault 

Resolution:
This may be caused due to the VFDs MCB main control board firmware where it is out of date and needs to be updated.
ATV630 firmware needs to be version 1.6IE15 or higher
ATV930 firmware needs to be version 1.3IE04 or higher
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