Bc Rotor • Testing; Testing Windings; Testing Continuity - Westerbeke 6.5 MCG Service Manual

TESTING THE BC ROTOR
THE GENERATOR
IS IDENTIFIED BY ITS LOUVERED
BACK COVER THAT IS FASTENED
BY FOUR HEX SCREWS
Testing fue generator can be accomplished with-
out removing the bearing support bracket. Simply tum the
armature to allow access for the testing as 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
4.00HM
TESTING THE ROTOR FIELD WINDINGS
. Unsolder the winding connection from the diode and care-
fully remove tl1e 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
wind~ngs
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
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.
Repeat these tests on the second set of windings on the
opposite side.
75
TESTING FOR
CONTINUITY
(TEST BOTH LEADS)