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ATV21/212 drive is stuck running at low speed and will not follow the analog input signal.

Issue:
ATV21/212 drive is stuck running at low speed and will not follow the analog input signal.

Product Line:
Altivar ATV21 ATV212

Environment:
All

Cause:
Drive is not following the remote analog signal coming in on VIA nor VIB

Resolution:
Check F112 it is factory set at 6 which is preset speed.  The factory set preset speed is 15hz.  So if your LL (low speed) is 20hz the drive will run at low speed.
Change F112 to 0 to turn off  or find what they want to program their logic input F112 to.
Also check FNOD make sure its set to 1 for VIA analog  inputs and 2 for VIB analog inputs.
If needed check the polarity voltage or current coming into these inputs make sure the positive signal is going into the analog input.
 

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