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Why are ATV31, ATV312 and ATV320 drives showing 0 on the display after a run command is given, and the motor is not running?

Issue:
Why are ATV31, ATV312 and ATV320 drives showing 0 on the display after a run command is given, and the motor is not running?

Product Line:
ATV31, ATV312, ATV320

Environment:
All 

Cause:
Drive stays at 0Hz when run command is given

Resolution:
If the drive is showing 0 on the display and the motor is not running.  You need to check your low speed to see if its 0hz or check your analog input signal.  The drive is getting the run command but has no speed reference to follow.
Check your analog input assignment on the CTL menu under FR1 or try setting your low speed above 0hz to see if the drive will run. 
Verify the polarity of your analog input is correct. The negative goes to COM and the positive gots to the AI terminal.
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