Westerbeke 5.0KW BCG-60Hz Service Manual page 71

BC GENERATORS TROUBLESHOOTING CHART MECC ALTE
(REFER TO THE WIRING SCHEMATIC BELOW)
A,B,C,&D refer to the components of the INTERNAL WIRING DIAGRAM and
their test procedures in the following pages.
WINDING RESISTANCE VALUES (OHMS)
5.0KW 7.0KW
NOTE:
This fault finding chatt is compiled assuming the engine is operating at
the correct speedlhertz.
MAIN STATOR:
#1 TO #3 0.4 0.2
FAULT
No AC Output
Residual Voltage
4-6 VAC (Hot N)
at No-Load
High AC Output
at No-Load
CAUSE TEST/CORRECTION
Shorted stator B
Open stator B
Shorted diode (two) A
Faulty capacitor (two)
Open exciter
Shorted exciter
Engine speed (hertz)
is too low
Electrical connections
are faulty
C
B
B
Adjust·
Inspect wiring
connections
I ncorrect voltage tap C
on capacitor
Incorrect capacitor C
Incorrect hertz tap
on capacitor C
Engine speed (hertz)
too high. Adjust'
#4 TO #6
0.4 0.2
ROTOR:
(Each pair) 4.0 2.0
EXCITER:
(Each winding) 3.9 2.5
CHARGE WINDING: 0.08 0.08
INTERNAL WIRING SCHEMATIC
r - - - - - - - - -
BRIDGE· - - - - - - - - - - - - .,
• FUSE •
: D
I : r:
I
r - . - - - - • ,
I
I
r
CHARGER,
I • ,
D;O_DEfrJ·
~-b- ----------- ~- ---, ----
0
-"~~U~J
I I I
Low AC Output Faulty rotor winding A :
A :
I
60-160V Faulty diode A
I -,
8
1
- - - - - - - - DioDe ': :
Faulty capacitor B :
tEl
'b :
Faulty diode A : :
I :
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
~~p~1~l:;:t(~ertz) A~jUst. ~ _______
j
r .
i -i --
-' i F
-n
JO
- 0 - - •
--1
: 50Hz 60Hz
7 7 6 0 H z
50H~2
Faulty Bridge rectifier 0 :
b ,0
b b .
00 0 0
i
Faulty integral controller 0 :
J.. ..
A..
.i..
4.:
Blown fuse B
L..-fl-----l L_-U-_..l,
Faulty wiring B
L __ ~~A~I~~
______
c~~~~.~
_1
Engine speed (hertz)
is too high
Electrical connections
are faulty, loose
Faulty support bearing
Generator rotor
connection to engine
is loose
Adjust*
Inspect wiring
connections
Inspect rear
bearing"
Check rotor
security**
A -
ROTOR WINDINGS
B -
STATOR WINDINGS
C -
CAPACITOR WINDING
D·
BATTERY CHARGE WINDING
*
Refer to the GENERATORS OPERATOR MANUAL
•• Refer to the GENERATORS SERVICE MANUAL
Engines & Generators
63