Testing Bc Rotor - Westerbeke 6.5 SBCG-60HZ Service Manual

TESTING THE BC ROTOR
THE GENERATOR
IS IDE.NTIFIED BY ITS LOUVERED
BACK GOVER THAT IS FASTENED
BY FOUR HEX SCREWS
Testing the generator can be accomplished with-
out removing the bearing support bracket. Simply tum the
armature to allow access for the testing
lJ.S
shown. ·
TESTING THE WINDINGS THROUGH THE DIODES
Rotate the armature into position to access a diode. To make
a quick test of the windings, assume the diode to
be
OK and
test the connection at each end of the diode. Tum the arma-
ture and test the other side.
ROTATING FIELD/AUXILIARY
WINDING RESISTANCE VALUE
4.0 OHM
TESTING THE ROTOR FIELD WINDINGS
Unsolder the winding connection from the diode and care-
fully remove the diode from its isolated heat sink using a thin
walled, deep well 7/16" (llmm) socket.
With the diode removed, both leads for the first group of
rotating field/auxiliary windings will be isolated with no
interference from a possibly faulty diode.
Check the resistance value of the rotating windings by
placing an ohmmeter's probes across the two exposed leads.
CONTINUITY TEST
.
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WINDINGS--
Check that no continuity exists between either of the winding
· leads and the generator shaft. If continuity is found, there is a
short in the windings.
74
Repeat these tests on the second set of windings on the
opposite side.
TESTING FOR
CONTINUITY
(TEST BOTH LEADS)