CHECKING CONDITION OF MAGNETIC CONTACTOR

A magnetic contractor or starter is uniquely made to produce power to electric motors. It has an overload relay which is attached physically and electrically, and can detect motor overload which triggers it the supply voltage to open and start. It is a switch that’s run by electricity and is used to operate electric motors, lighting, heating and other items loaded with electricity. This guide will aide you in testing a magnetic contractor.

Supplies and Materials 

• Magnetic contactor 

Tools and Equipment 

•  Multitester  
• Personal protective equipment
•  gloves - goggles 

Procedure 

1. Prepare the necessary tool, materials equipment and PPE in performing the activity.

2. Wear appropriate PPE.                                                                 



 3. Set the multi tester to range X1 or X10.

4. Connect the test probe of the multi tester to the terminals of the contactor holding  coil  (X1 X2). Zero or low resistance reading shows that the coil terminal of the holding coil is shorted. If the reading shows 6 – 60 ohms value, the coil is good. (Note: The terminal marking printed on the contactor, it is also indicated on the diagram below)

5. Connect the test probe to auxiliary contact normally open of the magnetic contactor (13 14), high resistance shows that contact is good. (Note: Pointer deflection of the multi-tester will indicate the condition of the contacts.)

6. Then, connect the test probe to the main contacts (L1 T1, L2 T2, L3 T3). Low resistance shows that the contact are good.

WATCH VIDEO BELOW:

Share on Google Plus

About