mschneider
Member
So, the background to this issue is yesterday this VFD got a cooling fan fault, every fan inside was working properly and was clean. We have no spare parts for this VFD, so I started looking into the program manual and found that this fault can be turned into an alarm if I upgrade from firmware 5 to 6.001. So, in order to keep the VFD operational for the plant until we figure out what parts we need to fix the cooling fan fault I did the upgrade. Basically the only information that the PLC 'consumes from and produces to' is it outputs CommandSpeed and Recieves OutputFreq. Since the upgrade, I can not get the VFD to change CommandSpeed. The PLC tag changes state, but the VFD stays locked in at 30 HZ. The PLC does get the OutputFreq from the VFD saying its running 30 Hz, so that half of the comms appears to be working.
We have several other VFDs connected to the same PLC operating the same way, and I've went through the settings on those to verify that my HIM backup reloaded correctly. Everything seems to be set correctly, but obviously I'm missing something...Any ideas?
Also, I should mention the VFD is fully operational currently the operator just needs to change speeds on the VFD in the electric room instead of on his HMI. I just set P90 [Speed Ref A Sel]to Preset Speed 1 (instead of DPI port 5) Then he changes P101 [Preset 1 Speed].
We have several other VFDs connected to the same PLC operating the same way, and I've went through the settings on those to verify that my HIM backup reloaded correctly. Everything seems to be set correctly, but obviously I'm missing something...Any ideas?
Also, I should mention the VFD is fully operational currently the operator just needs to change speeds on the VFD in the electric room instead of on his HMI. I just set P90 [Speed Ref A Sel]to Preset Speed 1 (instead of DPI port 5) Then he changes P101 [Preset 1 Speed].