Dear forum members,
Please share if you had a similar experience with an FFAO block not accepting CAS mode.
We had an issue with one of the Flow loops where the PID drives the FF AO block (a fieldbus actuator from Rexa, XPAC Actuator). The FF AO block at the output of PID should be in CAS mode to work properly, however it is not accepting CAS mode and shows up OUT OF SERVICE MODE. This issue has begun after the potentiometer on this actuator has been replaced with a similar POT due to maintenance. This valve has a local control where we are able to stroke it properly from Rexa control unit. Also, we are able to stroke it with a hand help communicator locally. However, we are not able to control it from the DV. What could be the probable cause for this behaviour?
Any suggestions and discussion is greatly appreciated!
Thanks,