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Can you use an external +24v on the ATV58 to power on the control board?

Issue:
External power supply on an ATV58

 Product Line:
Altivar 58

Environment:
 All models and serial numbers

Cause:
 None

Resolution:
An external +24v power cannot be used to power on the control board of an ATV58 drive.  The ATV58 generates its own +24v from the line voltage for use with the control circuits.  An external power +24v power supply can be used instead of the internal to control the drive if the common external supply is tied to the "com" terminal.  The external +24 and internal +24 must be isolated.    
 

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