inayatswatpk
Member
Dear Members,
I am doing a SCADA project on S7400H system. I am new to PID control and am facing a problem with programming PID control for three pumps to maintain a constant pressure at the outlet water header. The control phylosophy is that based on the pressure Set Point, I need to start one pump (lead) and increase its frequency from 0 - 50 Hz until the frequency is achieved. If the pump reaches 50Hz freq. and the SP is not reached then start the second (lag) pump and again increase its frequency in the range 0 - 50Hz to achieve the pressure Set-point. If during operation, any of the duty pumps fail then start the standby pump. I really need urgent help from you guys as i have a very tight schedule to complete the job. I know i am posting this a bit later at the project stage but i need your expert opinions and help on this one. If any of you have implemented similar control phylosopy in past on siemens controller, i would very much appreciate if i can get a copy of the logic used.
Will be awaiting your kind relpies.
Inayat
[email protected]
I am doing a SCADA project on S7400H system. I am new to PID control and am facing a problem with programming PID control for three pumps to maintain a constant pressure at the outlet water header. The control phylosophy is that based on the pressure Set Point, I need to start one pump (lead) and increase its frequency from 0 - 50 Hz until the frequency is achieved. If the pump reaches 50Hz freq. and the SP is not reached then start the second (lag) pump and again increase its frequency in the range 0 - 50Hz to achieve the pressure Set-point. If during operation, any of the duty pumps fail then start the standby pump. I really need urgent help from you guys as i have a very tight schedule to complete the job. I know i am posting this a bit later at the project stage but i need your expert opinions and help on this one. If any of you have implemented similar control phylosopy in past on siemens controller, i would very much appreciate if i can get a copy of the logic used.
Will be awaiting your kind relpies.
Inayat
[email protected]