Why might an ATV212 Drive always run at the low speed setting and not follow the analog input signal?

Resolution:
The low speed setting is parameter LL.

Verify that the VFD is setup to look for the analog input:
DIP switch SW100 position VIA at U (voltage) or I (current), VIB at U (voltage)
Frequency mode select, FMOd:
1 = VIA input
2 = VIB input

Verify the analog input signal by measuring the mA or Vdc on VIA / VIB.  Also check polarity, (+) on VIA / VIB and (- ) on CC.

Logic input R has factory default assignment as preset speed, F112 = 6, Sr1 = 15Hz.  If R is active, the VFD will run at 15Hz or LL (low limit) only. Check / correct the R input status and assignment.  Note that in an S-Flex product, R is a run permissive input, F112 = 1.  If a replacement ATV212 is installed or the VFD was reset to factory defaults, reprogram the VFD per the S-Flex manual.

Verify that the PID parameter, F360, is set correctly:
0 = no PID control
1 = PID per VIA feedback
2 = PID per VIB feedback

If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:

Frequently Asked Questions - Schneider Electric (se.com)

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