Westerbeke 6.5 MCG - BC GENERATORS TROUBLESHOOTING; TESTING CONTINUITY; TESTING THE CAPACITOR(S)

BC GENERATORS TROUBLESHOOTING CHART
A,B,C,&D refer to the components of the INTERNAL WIRING DIAGRAM and
their test procedures in the following pages.
NOTE: This fault finding chart is compiled assuming the engine is operating at
the correct speed/hertz. ·
FAULT
CAUSE
TEST/CORRECTION
No AC Output
Residual Voltage
4-6 VAC (Hot··N)
at No-load
High AC Output
at No-load
low AC Output
60·160V
Voltage Drop
Under load
(or at No-load)
No Battery Charge
low Battery Charge
High Voltage
Output when load
is applied
Unstable Voltage
Noisy Operation
Shorted stator
Open stator
Shorted diode (two)
Faulty capacitor (two)
Open exciter
Shorted exciter
Engine speed (hertz)
is too low
Electrical connections
are faulty
Incorrect voltage tap
on capacitor
Incorrect capacitor
Incorrect hertz tap
on capacitor
Engine speed (hertz)
too high.
Faulty rotor winding
Faulty diode
Faulty capacitor
Faulty diode
Faulty capacitor
Engine speed (hertz)
is too low
Faulty Bridge rectifier
Faulty integral controller
Blown fuse (s)
Faulty wiring
Engine speed (hertz)
is too high
Electrical connections
are faulty, loose
Faulty support bearing
Generator rotor
connection to engine
is loose
* Refer to the GENERATORS OPERATOR MANUAL
*~Refer to the GENERATORS SERVICE MANUAL
8
8
A
c
8
8
Correct *
Inspect wiring
connections
c
c
c
Correct •
A
A
B
A
c
Correct*
D
D
B
8
Correct •
Inspect wiring
connections
Inspect rear
bearing**
Check rotor
security**
72
WINDING RESISTANCE VALUES COHMS)
5.0KW
6.5KW
MAIN STATOR:
#1 TO #3
0.4
0.2
#4 TO #6
0.4 0.2
ROTOR:
(Each pair)
4.0
2.0
EXCITER:
(Each winding)
3.9
2.5
CHARGE WINDING:
0.4 0.4
(#50-AC)
INTERNAL WIRING SCHEMATIC
A· ROTOR WINDINGS
8 ·STATOR WINDINGS
C ·CAPACITOR WINDING
D • BATIERY CHARGE WINDING