dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorLibraries and solutionsdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorPumping librarydl-breadcrumb-item__separatorControl philosophy of pumping librarydl-breadcrumb-item__separatorStage 1: Comparator
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Stage 1: Comparator

The set process value (e.g., pressure in psi, flow rate in m3/h) is compared with the measured actual value. The distributor uses the output of the comparator to decide the number of pumps and their operating speeds to meet the demand.

  • Pressure control and Flow control:

    •Pressure control and Flow control: In pressure and flow controls, the function block “PmpPid acts” as a comparator which gives the “PidOut” in [%] to the function block “PmpPressureDistributor” or “PmpFlowDistributor”. In the distributor the PID output is then converted as reference speed set point to the pumps.

  • Emptying or Filling mode:

    • Emptying or Filling mode: In emptying or filling modes, the function block “PmpLevelComparator” is used to compare the actual level of the tank with the set levels to start or stop the pumps. This information is sent to the distributor by the output “NumberOfPumpDemand”. For example, in filling mode, at lower actual level more pumps are needed to run, to fill the tank.