508033-02 Issue 2135 Page 23 of 48
Troubleshooting Motor Windings
Ensure that motor windings are not damaged by performing
the following tests:
NOTE: If your ohm meter is not an auto-ranging type, set
it to the highest ohm scale (100k ohms or greater) before
performing tests.
Scale
Measurement Range
In Words ohms
2M
two megohm - two
million ohms
0 - 2,000,000
200k
two hundred kilohm
- two hundred
thousand ohms
0 - 200,000
20k
twenty kilohm --
twenty thousand
ohms
0-20,000
2k
two kilohm -- two
thousand ohms
0 - 2,000
200 two hundred ohm 0 - 200
Table 14. Ohm Meter Range
Figure 10.
TEST A
Measure the resistance between each of the three motor
leads (3-pin plug) and the unpainted part of the end shield.
If the winding resistance to ground is <100k ohms,
replace the motor and control module. If the resistance
to ground is >100k, the motor windings are ne.
Proceed to Test B.
Test A
Figure 11.
TEST B
Use an ohmmeter to measure the motor phase-to-phase
resistance by checking these combinations of the the 3-pin
motor plug. For the purpose of this test, start at either end
of the connector as lead 1.
1. The lead-to-lead resistance across any two leads
should be less than 20 ohms.
2. Each lead-to-lead resistance should be the same.
If the measured resistance is greater than 20 ohms, replace
the motor and control module.
Test B
Figure 12.
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