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Why would a ATV61 drive be running ok and then goes to rdy

Issue:
Why would a ATV61 drive be running ok and then goes to rdy
 
Product Line:
ATV61 Drives
 
Environment:
 Run Command

Cause:
 n/a

Resolution:
The ATV61 was running ok and then went to rdy.  Needs to check the run command.  For 2-wire control. LI1 should have +24v. Can go to 1.2 and select I/O map and check the status of LI1 or measure LI1 at the terminal card.  If it drops low, they are loosing the run command. 
 
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