Good day all. I just installed a basic pressure control loop the other day. It's in a stand alone CompactLogix that serves no other purpose than to control a well water pump. Now, along with maintaining constant pressure, I'm tasked with decreasing pump speed should the flow rate go above X gpm.
I've not done this exact thing before but I see two possible solutions. One would be to create a master/slave PID arrangement where flow above X gpm would decrease the pressure PID setpoint until flow goes below X. The other would be to keep the flow & pressure PID loops separate and make the pump command the sum of the CVs.
What's the preferred method for handling this scenario?
PLC: 1769-L16ER-BB1B, V21 firmware
FVD: PowerFlex753, 25hp HD w/ 20-750-ENTR comm card.
Thanks in advance.
I've not done this exact thing before but I see two possible solutions. One would be to create a master/slave PID arrangement where flow above X gpm would decrease the pressure PID setpoint until flow goes below X. The other would be to keep the flow & pressure PID loops separate and make the pump command the sum of the CVs.
What's the preferred method for handling this scenario?
PLC: 1769-L16ER-BB1B, V21 firmware
FVD: PowerFlex753, 25hp HD w/ 20-750-ENTR comm card.
Thanks in advance.