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ATV71: Why is the drive tripping on an INF8 code, (internal power supply fault)?

ATV71 is tripping on an INF8 fault.
Product Line: 
Altivar ATV61 and ATV71
All types
The control supply voltage is to incorrect.
Check the control supply voltages on +24vdc and com or +24V and 0V. 
If using an external supply +24Vdc supply connect to P24 to 0V, and insure the voltage is greater than 19Vdc and does not exceed 30vdc.
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