Recent content by Berg88

Updated control logic added. :-)

Thanks for the welcome. :-) The fan(s) are supplying a common air plenum for my building. The fan speed is ultimately based off of a plenum pressure set point (.6"wc). However, I am only concerned on how the ALC logic is calculating this particular fan speed. It may not even be fan speed but...

Hi All, I have a VFD running supply fans and I currently have two values I can see. One is the VFD actual speed percentage from the VFD. The other is a calculated Fan Speed based off of VFD current. (I control off the calculation). The calculation is (Current^.33)*25.54=%. Does anyone know this...