Battery Charging Circuit - Westerbeke 5.0KW BCD Operator's Manual

Be GENERATOR SINGLE PHASE
NOTE: WESTERBEKE recommends that the following generator tests
and adjustments be pelf armed by a qualified technician.
INTEGRAL CONTROllER (I.C.) Testing the Battery Charging Circuit
The Integral Controller (I.e.) is an encapsulated, solid-state
unit that supplies a DC charging voltage to the generator's
starting battery while the generator is opening.
Charging Voltage: 13.0 -14.0 volts DC
CbargiQgAruperage: 0 -10- amps DC
A
separate group of stator windings supplies AC voltage to a
blidge rectifier which converts theAC current to supply the
I.e. unit. The I.C. unit senses the needs of the starting battery
apd supplies a DC charge when one is needed. If you suspect
that the I.e. unit is faulty (that is, if the battery'S charge is
low), check the charging circuit and it's components as
d~bed
in the following steps. Check all connections for
cieahliness and tightness including the ground before replac-
ing.the I.e. unit.
NOTE:
When the generator
is
first started, the J. C. unit will
produce a low charging rate. This charging rate will rise as
the generator is operated.
1]he Integral Controller is mounted inside the generator hous-
ing in the 12:00 position. There is a voltage output adjust-
ment on the controller that will allow a DC voltage output
adjustment of
±
2 volts.
+
o
BCD and BCDA MODELS
DC
BRIDGE RECTIFIER
BCDB MODELS
VOLTAGE OUTPUT"
ADJUSTMENT
(ON BACK)-
_ - - I n _ . J
+
_ GND
BLACK
YElLOW
GROUND TO
GENERATOR CASE
AC
BRIDGE
RECTIFIER
1. Bridge Rectifier
Normal AC voltage running to the rectifier (while the
engine is operating at 1800 rpm) is measured across the
two AC connections on the bridge rectifier. (As
illustrated).
AC voltage running to the bridge rectifier (approximate):
No-load off the generator 16.0 volts AC
Full-load off the generator 17.5 volts AC
Normal DC voltage running out of the rectifier (in volts
DC) is measured across the two DC connections of the
bridge rectifier; that is
+
and -.
DC voltage running from the bridge rectifier
(approximate):
No-load off the generator
Full-load off the generator
2. AC winding: 0.14 ohm
17.0 volts DC
18.5
volts DC
Lift the two AC wire leads off the bridge rectifier and
measure, the resistance between these two leads with an
ohmmeter. It should measure 0.14 ohm. No continuity
should exist between these two leads and the ground or
the main AC stator windings.
3. Testing the Bridge Rectifier (meter used - Simpson 260)
A. Set your ohmmeter's scale on RX1 (+ DC) and set the
needle to zero.
B. Connect the (+) positive lead from the ohmmeter to
point #4. Taking the ohmlJleter's negative (-) lead,
momentarily touch points #1, #2, #3, and #5. The ohm-
meter should TI;:gister no deflection tor any of the
points touched.
C. Remove the positive (+) lead from point #4 and
connect the negative (-) lead; momentarily touch
points #1, #2, and #3. The ohmmeter's needle should
deflect when each point is touched.
D. Leaving the negative ohmmeter (-) lead on -point #4,
touch point #5 with the positive lead. No deflection
should take place.
E. Place the positive (+) lead on point #1 and the negative
(-) lead
011
point #3. The ohmmeter again should not
register any deflection (no deflection indicated infinite
resistance). Reverse these connections and the ohmme-
ter should again register no deflection. If the rectifier
fails any of the previous tests (A-E), replace the recti-
fier because it is defective.
NOTE: Different types and/or brands of test meters may
produce-opposite test results.
POINT #1
POINT #4
POINT #5
MOUNTING HOLE
Engines
&
Generators BRIDGE RECTIFIER
48