Westerbeke 5.0KW BCG-60Hz Service Manual page 73

BC GENERATORS TROUBLESHOOTING CHART
COLISEUM MODEL
(REFER TO THE WIRING SCHEMATIC)
FAULT CAUSE TEST
NO AC VOLTAGE OUTPUT 1. Shorted stator 1. W1 & W2
2. Open stator
3. Rotor diode open/shorted
2. W1
&
W2
3.01 & 02
RESIDUAL VOLTAGE 3·4 VAC 1. Faulty capacitor
LINE TO N AT NO LOAD 2. Open exciter winding
3. Shorted exciter
4. Engine speed low
5. Electrical connection
HIGH AC OUTPUT 1. Engine speed too high
AT NO LOAD 2. Capacitor connection
LOW AC OUTPUT
60·100 VAC
VOLTAGE DROP
UNDER LOAD
HIGH VOLTAGE OUTPUT
(NO LOAD/LOADEDj
UNSTABLE OUTPUT
1. Faulty rotor winding
2. Faulty diode (shorted)
3. Faulty capacitor
4. Faulty exciter windings
1. Faulty diode
2.Engine speed low
3. Faulty capaCitor
1.
Engine speed
1. Electrical connection
2. Engine speed
1. C1
2. EW1 - EW2
3.
EW1 • EW2
4.
Adjust
5. Inspect
1. Adjust
2.
Correct
1.RW
2.01 or 02
3.
Check rating
4. Check windings
1. 01
or 02
2. Check/adjust
3 Check rating
1. Check/adjust
1.CJ1eck
2. Check/adjust
GENERATOR WINDING SCHEMATIC
NOTES:
For 60Hz operation: Connect capacitors to
E31-E41 and to Ell-E21.
For 50Hz operation: Connect capacitors to E31-E42
and Ell-E22.
EW1-Exciter Windings 1
EW2-Exciter Windings 2
BCW-Battery charging windings
RW-Rotor Winding
""C:1JCl
Ell E21
E22
"I--~"_
. . . .
EWl
RW
W1
W1·Stator Winding 1
W2·Stator Winding 2
C·Capacitor
D1/D2·Diodes
...---------T11
r------T31
tfl--_ .... ---'" ......
---T41
0 2
rnr1lC1JL.V-1------~~~
~~E42
V2
Engines & Generators
65
POTENTIAL Be PROBLEMS
Diodes
1. An open diode will cause the loss of any rotating field.
2. A shorted diode will weaken the rotating field.
Field Windings
1.
An open field winding will cause the loss of the rotating
field.
2. A shorted field winding will cause a weak rotating field.
3. Test each diode individually. A resistance value should be
found through the diode in one direction and, with the
meter probes reversed, show no ohm value.
RESIDUAL VOLTAGE TEST
(unit operating at rated hertz)
Exciter circuit capacitor disconnected from exciter windings
MAIN STATOR RESIDUAL VOLTAGE (Live to neutral)
3·4VAC
EXCITER WINDING GROUP
EWI
EW2
E31·E42
Ell toE22
S-6VAC
5·6VAC
NOTE:
The presence of correct residual voltage is an
indication the winding is O.K. (main stator or exciter
windings).
WINDING RESISTANCE VALUES (OHMS)
5.0KW 7.0KW
EXCITER WINDINGS:
EW1 (E11 & E22) 3.4
2.2
EW2 (E31 & E42)
3.4 2.2
BATTERY CHARGING:
BCW
0.5
0.5
STATOR WINDINGS:
W1 (T11 & T22)
0.6 0.9
W2 (T31 & T42)
0.6
0.9
ROTOR WINDINGS:
RW
1.7
2.2