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Drive Multiple Speeds with Different Reference using PLC

Drive multiple speeds with different reference. Write PLC program for drive multiple speeds with different reference.

PLC Multiple Speed Reference

PLC program for VFD Drive Multiple Speeds

In drive application we need to operate drive in multiple speeds using different speed reference. This function is possible using PLC. For example here there is one drive and it needs to be operated with different speed reference. We will operate drive with three different speeds.

Consider three reference buttons which can select speed as per requirement. First select momentary button so drive reference will be moved in analog reference of the drive. When reference is moved and start button is pressed, drive will run as per the moved speed.

List of Inputs/Outputs

List of Inputs

  • Start PB :- I1
  • Stop PB :- I2

List of Outputs

  • Motor :- Q1

List of register

  • Register A :- Analog reference for drive
  • Memory coil 1 :-Speed 1
  • Memory coil 2 :-Speed 2
  • Memory coil 3 :-Speed 3

PLC Ladder programming explanation

NETWORK 1 :

Motor START STOP logic

Motor START/STOP logic is used to operate motor. Also latching circuit is used for latching.

NETWORK 2 :

MOV Instruction for PLC

Move instruction is used for first speed reference. If speed 1 button is pressed form SCADA or HMI, drive will run as per given speed.

NETWORK 3 :

Instructions in SCADA or HMI

Move instruction is used for first speed reference. If speed 2 button is pressed form SCADA or HMI, drive will run as per given speed.

NETWORK 4 :

Speed Reference Instruction

Move instruction is used for first speed reference. If speed 3 button is pressed form SCADA or HMI, drive will run as per given speed. .

NETWORK 5 :

Reset logic is used for interlocking

Reset logic is used for interlocking (for Speed Reference 1).

NETWORK 6 :

Programmable Logic Controller Speed Reference Instruction

Reset logic is used for interlocking (for Speed Reference 2).

NETWORK 7 :

VFD Different Speed Reference PLC Logic

Reset logic is used for interlocking (for Speed Reference 3).

Author : Bhavesh

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1 comment

Nkosozuko June 10, 2019 at 1:37 pm

This site is very good in eDucating with plc

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Drive Multiple Speeds with Different Reference using PLC

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