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Why will the drive not accept a 3 wire control selection?

Issue
Why will the drive not accept a 3 wire control selection?
 
Product line:
Altivar ATV61 ATV71 ATV312
 
Environment
All models, all serial numbers
 
Cause
3 wire configuration is available; however, the parameter will not change when attempted to save it.
 
Resolution
When saving the parameter to 3-wire control, ENTER must be depressed and held for about 3 seconds in order to save it.  Also, ensure that there is no run command applied.
 
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