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Home / Technical Articles / How can a PLC and VFD be used for pump control (power and control circuits)

Introduction to PLC/VFD motor control

For the last several decades, every engineering task related to process control is realized by the use of PLC (Programmable Logic Controller). If we are talking about induction motor control, which is the most common case, usually a VFD (Variable Frequency Drive) is electrical device placed “between” a PLC and motor, providing a connection of control logic and circuits on one side, with desired power output at the other side.

How can a PLC and VFD be used for pump control (power and control circuits)
How can a PLC and VFD be used for pump control (power and control circuits)

In that way, these three devices (PLC, VFD and motor), together with field measuring devices, represent one functional whole, capable for control, supply, protection and monitoring of some process consumer driven by induction motor.

In this article, a real example of submersible pump control will be described. Attention will be given to description of electrical devices, signals, and operation principle.

Example of pump control

Submersible pump, which is a subject of this example, is used for WWTP (Waste Water Treatment Plant) inlet chamber level control. Physical appearance of this pump type during installation is shown in Figure 1.

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Miodrag Kokotovic

Graduated from Faculty of Electrical Engineering, within University of Belgrade, in the field of electrical power systems. Expert in electrical part of tender preparation, design, procurement, construction and commissioning of treatment plants and pumping stations, electrical power quality and energy management.

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