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Motor Trip Logic using PLC Programming

Programmable Logic Controller (PLC) Questions and Answers

This PLC is being used to start and stop an electric motor, and also to shut it down automatically if any of three “shutdown” conditions occur:

  • Excessive vibration
  • Overcurrent (overload heater contact)
  • High winding temperature

Motor Trip Logic using PLC Programming

Motor Trip Logic using PLC Programming

The status of each shutdown contact is as follows:

  • Vibration contact: closed when okay, opens when vibration becomes excessive
  • Overload contact: closed when okay, opens when overloaded
  • Temperature contact: open when okay, closes when hot

Draw a PLC ladder-logic program to start and stop this motor.

Be sure to make the program latching so that the operator does not have to hold the Start button to keep the motor running.

Answer :

PLC Motor Interlocks

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Credits : by Tony R. Kuphaldt – under CC BY 1.0

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5 comments

amani April 17, 2018 at 2:34 pm

fantastic title
thanks

Reply
Anthony September 9, 2019 at 3:43 pm

This is indeed a powerful source of information. I am truly humbled.

Thank you

Maphalla MA

Reply
Francis Usen November 6, 2019 at 1:47 am

God bless

Reply
Francis Usen November 6, 2019 at 2:07 am

sorry, X1, X2, X3 should be NC Contacts here.

Reply
morshadul haque December 5, 2019 at 2:15 pm

good idea

Reply

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Motor Trip Logic using PLC Programming

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