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Why the vfd will not ramp to the correct speed of the 0-10V signal on AI1?


Issue:
The analog input signal do not match what is being sent.

Product line:  
Altivar 61/71

Environment:  
All models, all serial numbers   

Cause:
The AI1 input is a bipolar input.  If AI1 negative is not referenced to common the drive is looking for a range of 20 V dc ( +10 to  - 10).  

Resolution:
Verify the factory installed jumper between AI1- and common terminals is installed. 
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