Trade of Electrician Induction Motors COURSE NOTES - eCollege
Trade of Electrician Induction Motors COURSE NOTES - eCollege
Trade of Electrician Induction Motors COURSE NOTES - eCollege
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FAS Electrical Course Notes – Module 2.4.1<br />
Insulation Resistance Test between Windings and Frame<br />
Step 1 Isolate the motor electrically and mechanically if necessary.<br />
Step 2 Make a careful note <strong>of</strong> how the supply cables and any links are connected, so as<br />
to avoid errors when reconnecting. Remove the links and the supply cables<br />
before carrying out the test. Disconnecting the supply cables ensures that there<br />
are no parallel paths via any control equipment, which would lead to false<br />
readings being obtained.<br />
Step 3 Check the insulation resistance between main winding and frame as shown in<br />
Figure 42.<br />
U1<br />
Main ( Run ) Winding<br />
Rotor<br />
40<br />
Auxiliary<br />
( Start )<br />
Winding<br />
Z1 Z2 U2<br />
Motor Terminal Box<br />
Insulation<br />
Resistance<br />
Tester<br />
Figure42.<br />
PE<br />
Revision 2 Nov 2006
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