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What will cause the ATV71 not to pass the encoder test?

What will cause the ATV71 not to pass the encoder test?
Issue: 
What will cause the ATV71 not to pass the encoder test?
 
Product Line:
Altivar 71
 
Environment:
All serial numbers
 
Cause:
The VFD will not pass the encoder check test.
 
Resolution:
1).  Check [Number of pulses] (PGI) and [Encoder type] (EnS)
2).  Check that the encoder’s mechanical and electrical operation, its power supply and connection are all correct.
3).  If necessary, reverse the direction of rotation of the motor or the encoder signals        
 
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