Greetings,
I have a setup where a Siemens PLC controls two PIDs: one for VFD speed maintaining flow at 360 gpm and a PCV controlling a recirculation valve back to the supply tank to maintain system header pressure at 90 psig. They are individual loops and wondering what is the standard to avoid them fighting each other.
I have a setup where a Siemens PLC controls two PIDs: one for VFD speed maintaining flow at 360 gpm and a PCV controlling a recirculation valve back to the supply tank to maintain system header pressure at 90 psig. They are individual loops and wondering what is the standard to avoid them fighting each other.