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Hello Everyone... I got a project of pumping station... Need your help to fulfill client requirements through PLC logic... #System# There are 6 pumps, every pump is Controlled by Individual VFD, and all 6 VFDs are in Communication with PLC. Output header is common for all pumps, and a Pressure Transmitter is connected at output header... #Logic Requirements# Now when we start sequence in auto, the least run hour vfd should start first and increase the frequency slowly to maintain the pressure setpoint, now if vfd1 at 50hz and pressure is lower then the SP next vfd according to run hour should start and and increase frequency slowly, afterwords 3rd vfd according to runhour and so on untill pressure match SP, then maintain the pressure of header... If pressure increases above the setpoint, last started vfd should reduce rpm and shut down first and then second last started to shutdown and so on... And client also need enable-disbale logic, if they mark a pump disable then that pump should not start... Can you help me out and suggest anything, or provide some sample backups or documents ?

Hello Does someone have a good way to control pressure using PID in cx-programmer? I got two pumps and one PT(4-20mA) Half the year only one pump need`s to run (about 3bar) but in the season (i work in a fabric) two pumps need to be running (about 4bar needed) except in the night. I`m going to use HMI for adjusting the setpoint so there is no need for any clock/date for this to change itself. The question is how to get one of the pumps to shut down when the need for pressure is not so high. And get the pumps to change "main" pump sometimes so one pump is not running all the time. Hope this was understandable