Guardian Technologies 4759 TEST 7 TESTING THE STATOR WITH A VOM, Section, Part, Diagnostic Tests

AC GENERATORS

PART 2

SECTION 2.4

DIAGNOSTIC TESTS

from each other and are not touching the frame during the test.

5.Set a VOM to its "R x 1" scale and zero the meter.

6.Refer to Figure 5 for pin locations of Connector C2. Use a large paper clip or similar metallic object to access pins in connector C2.

Note: Pins 9, 10, 11 & 12 are not used for this test.

Figure 4. Field Boost Test Points

TEST 7: TESTING THE STATOR WITH A VOM

DISCUSSION:

AVolt-OHM-Milliammmeter (VOM) can be used to test the stator windings for the following faults:

❏ An open circuit condition

❏ A "short-to-ground" condition ❏ A short circuit between windings

Note: The resistance of stator windings is very low. Some meters will not read such a low resistance, and will simply indicate CONTINUITY. Recommended is a high quality, digital type meter capable of reading very low resistances.

PROCEDURE:

1.Disconnect stator leads 11 and 44 from the main circuit breaker.

2.Disconnect stator leads 22 and 33 from the neutral connection separate the leads.

3.Disconnect Connector C2 from the side of the control panel (C2 is the closest to the back panel).

4.Make sure all off the disconnected leads are isolated

Figure 5. C2 Connector	Figure 6. C2 Connector
Pin Locations	Pin Locations
(Female Side)	(Male Side)

7.Connect one test lead to stator lead Wire 11. Connect the other test lead to stator lead Wire 22 (power winding). Note the resistance reading and compare to the specifications on Page 2.

8.Connect one test lead to stator lead Wire 33. Connect the other test lead to stator lead Wire 44 (power winding). Note the resistance reading and compare to the specifications on Page 2.

9.Connect one test lead to Pin 1. Connect the other test lead to Pin 2 (battery charge winding). Note the resistance reading, compare to specifications on Page 2.

10.Connect one test lead to Pin 3. Connect the other test lead to Pin 4 (engine run winding). Note the resistance reading, compare to specification Page 2.

11.Connect one test lead to Pin 5. Connect the other test lead to Pin 6 (power winding-sense leads). Note the resistance reading, compare to specification Page 2.

12.Connect on test lead to Pin 7. Connect the other test lead to Pin 8 (excitation winding). Note the resistance reading, compare to specification Page 2.

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