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Troubleshooting Motor Windings
Ensure that motor windings are not damaged by perform
-
ing 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.
TABLE 13
Ohm Meter Range
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
FIGURE 12
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 resis-
tance to ground is >100k, the motor windings are
fine. Proceed to Test B.
Test A
FIGURE 13
TEST B
Use an ohmmeter to measure the motor phase-to-phase
resistance by checking these combinations of 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 14
