Why might an ATV212 Drive always run at the low speed setting and not follow the analog input signal?
Issue:
ATV212 running at low speed and not following the analog input signal
Product Line:
Altivar ATV212
Environment:
All
Cause:
Drive is not following the remote analog signal coming in on VIA or VIB
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