PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
5th Edition
ISBN: 9781266481475
Author: Petruzella
Publisher: MCG
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Chapter 6, Problem 1RQ

Explanation of Solution

Principle of an electromagnetic control relay:

  • The working of an electromagnetic control relay is based on the principle of magnetic induction.
  • It consists of an electromagnet or coil to switch contacts.
  • When the coil is energized, the movable contacts in between the fixed contacts will swing and come in contact with the bottom fixed contact.
  • This results in passing current through the coil of the relay.
  • On the other hand, if the coil is de-energized, then the movable contact will be detached from the fixed contact and acts as an open circuit.
  • Hence, no current will be passed through the relay.

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