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What will cause the ATV212 drive inside of the S-flex not to power up when you switch the AFC off bypass switch to AFC mode?

Issue:
What will cause the ATV212 drive inside of the S-flex not to power up when you switch the AFC off bypass switch to AFC mode?

Product Line:
Altivar ATV212 S-flex enclosed with bypass option and B07 mod

Environment:
All 

Cause:
Line contactor is not pulliing in to power up the variable speed drive. because the OLR was tripped. 

Resolution:
1st check to see if the red power LED is powered on the outside of the enclosure.  If this red power LED is on then we know the CPT and fuses are all good.
2nd check to see if the Line contactor is pulled in.  If the line contactor is not pulled in check the control circuit to see what might be not allowing the contactor to pull in. 
3rd check to see if the bypass circuit works by puttiing the AFC off bypass switch in bypass mode.
4th If the bypass contactor is not pulling in and the line contactor is not pulling in check to see if the OLR has tripped and needs to be reset.
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