Multiple Pumps Control using PLC

Last updated: March 4, 2021 2:17 pm

3 Min Read

Write the PLC program to control multiple pumps using programmable logic controllers. We have two input pumps used to fill a tank. Make sure pumps operate in an equal amount of time over their lifetime.

Contents

Multiple Pumps Control using PLC

Program Logic:

Develop ladder logic program according to the logic given below,

The start/stop push button is provided for control of the two input pump motors P1 and P2.
The Start/Stop pushbutton station is operated to control pump P1.
When the tank is full drain pump motor P3 is started automatically and runs until the low-level sensor is actuated.
After 3 fillings of the tank by pump P1 control automatically shifts to pump P2.
The operation of the start/stop pushbutton now controls pump P2.
After 3 fillings of the tank by pump P2, the sequence is repeated.

PLC Program:

Program Description:

Rung 0000:

Start/Stop PB latched with memory B3:0/0.

Rung 0001:

B3:0/0 enabled to turn on B3:0/1 which is to turn ON PUMP P1 (O:0/0) when low-level sensor(I:0/3) turn ON and High-level sensor (I:0/2) is in off condition.B3:0/1 is latched with low-level sensor because pump p1 should not go off once water started rising.

Rung 0002:

Memory contacts used to turn on PUMP P1 (O: 0/0) with counter (C5:0).

Since we are going to shift pump operation from P1 to P2, two counters are used to shift between Pl and P2.

Counter C5:1 is used to turn on PUMP P2(O:0/2).

Rung 0003 & 0004:

B3:0/0 enabled to turn on B3:0/2 which is to turn on PUMP P3(O:0/1) when high-level sensor(I:0/2) turn ON and low-level sensor (I:0/3) is in off condition.B3:0/2 is latched with high-level sensor because pump p3 should not go off once water started reducing.