Fotonic Posted January 24, 2019 Report Share Posted January 24, 2019 Hi all, I am trying to set the frequency of an UMI VFD via the AO2 line of the snap-in I/O module (V200-18-E46B) connected to an V700 PLC, signal is 4-20 mA. The VFD is set to get frequency value from AI2 input and the corresponding dip switch is correctly set for the mA input selection. On the VFD, I set the P05.37 (Lower limit of AI2) parameter to 0400 so that 4 mA from PLC correspond to 0 Hz. My problem is the range of values that the MI associated with AO2 output can be set to. If I understand correctly, the MI = 0 correspond to 4 mA output from PLC so that the VFD should be set to 0 Hz. Then for the maximum value I should consider MI = 4095 to set 50 Hz on VFD. But there's something weird going on, VFD is at 0 Hz until MI = 8 and then starts raising and reaches 50 Hz before MI value reaches 4095. What am I doing wrong? Can someone help solving this issue? Where can I look for an example on this topic? Thanks in advance for support. Quote Link to comment Share on other sites More sharing options...
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