Feb 6, 2011

PLC Programming For Pump Running Cycle

Pump Running Sequence have to be defined in many applications where we have 4 or 5 pumps and we want the running of 2 or 3 pumps at a time. It may be also possible that we may want to Operate the pump according to the Level. Here in this article we will see the PLC programming for running Sequence of Pump according to level.

PLC Programming For Pump Running Cycle| Pump Running Sequence

Here we will take a example that there is a wet well and 3 pumps are there in the wet well, and there is one Ultrasonic sensor for Level measurement. The operation of Pumps will be according to Cycle , and three cycles are defined as below.
Cycle I - Pump 1 and Pump 2 Run.( Pump 3 on stand By)
Cycle II - Pump 2 and Pump 3 Run.( Pump 1 on stand By)
Cycle III - Pump 1 and Pump 3 Run.( Pump 2 on stand By)

After cycle III the Cycle I will again restart. In any cycle if one of the Pumps fail or trip then the standby pump will come in Operation.

||PLC Logic for Cycle|Pump Operations||

The operation of Pump will be according to level. Let us take the height of wet well as 1000MM and Ultrasonic Sensor is there for level measurement , when the level reaches 50 MM Pump 1 will start and when level reaches 500MM Pump 2 will start , so the level will come down and when level again comes at 20MM the cycle will change and next cycle will Start and this process continues on.

PLC Inputs :-
Analog Input - 2001 Ultrasonic Sensor
0.0 - Pump 1 Trip
0.1 - Pump 2 Trip
0.3 - Pump 3 Trip

PLC Outputs :-
100.0 - Pump 1 Run
100.1 - Pump 2 Run
100.2 - Pump 3 Run

We here are making the PLC Logic using the Omron CJ1M PLC , however the Logic can be made in any PLC after Understanding the PLC Program. CX-Programmer is the the PLC Programming software for programming the Omron PLC.
You can download the PLC Program from below , both .cxp and .pdf files are attached.

Download PLC Program for Pump Running Sequence.

Note :- Before studying this PLC Program you should know Analog Input connection and Its Programming.

You can learn the complete step by step PLC Programming here in Automation Talk , You can see more Sample PLC Programs.

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