Bryant ASPAS1BBA007, Diagnostic Repair Manual, Page: 39 / 144

Page 39
SECTION 2.4
DIAGNOSTIC TESTS
AC GENERATORS
Figure 4. Field Boost Test Points
TEST 7: TESTING THE STATOR WITH A VOM
DISCUSSION:
A Volt-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). See Figure
9, page 128 for connector location.
4. Make sure all off the disconnected leads are isolated
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.
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 inside front cover.
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 inside front cover.
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 inside
front cover.
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 inside front cover.
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 inside front
cover.
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 inside front cover.
PART 2
Figure 5. C2
Connector Pin
Locations
(Female Side)
Figure 6. C2
Connector Pin
Locations
(Male Side)