Westerbeke W-46 - BT Generator Internal Wiring; 3 Phase Twelve Wire Reconnectable Wiring; BT Generator Troubleshooting (3 Phase)

BT GENERATOR INTERNAL WIRING
3 PHASE TWELVE WIRE·RECONNECTABLE
r-------------.
I I
I ' A EXCITER STATOR I
I I
I I
I r-----~--------~-,u
,-------,
1 DsTATDR I
I 1 I I 10
I 1 I C l
: : EX'TER : ROTOR FJElD : S
I I I 6
I I
I I 2
I I
I I 4
I I
I I
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·s
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ca
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RED
BLUE
YELLOW
BT GENERATOR TROUBLESHOOTING/3 PHASE
GREEN
11
9
7
5
1
3
RESISTANCE VAWES
A. EXCITER STATOR (17.9 ohm)
B. EXC~:t"ER ROTOR WINDINGS a b c (0.6 ohm) _
C. ROTATING FIELD (2.49 ohm)
D. MAIN STATOR WINDINGS (0.05 ohm}
AUXILIARY WINDING (1.2 ohm)
E. VOLTAGE-REGULATOR -
NOTE: AC generator troubleshooting must be performed with the engine operatin at 60Hz,
F. AUXILIARY CIRCUIT FUSE
FAULT
NO AC VOLTAGE OUTPUT AT NO LOAD.
RESIDUAL VOLTAGE PRODUCED AT
NO LOAD 15 • 20 VOLTS AC.
LOW AC VOLTAGE OUTPUT AT,
NO LOAD 60 ·100 VAC.
HIGH AC OUTPUT VOLTAGE
150 VAC OR HIGHER.
UNSTABLE VOLTAGE OUTPUT.
AC VOLTAGE DROP UNDER LOAD
60 ·100 VOLTS AC.
PROBABLE CAUSE
1. Short or open in the
main stator winding.
2. Shorted suppressor
on exciter rotor.
3. Four or more shorted or
open diodes on exciter r.oto.r.
1. Blown 6 AMP fuse
auxiliary circuit AVR.
2. Faulty voltage regulator
1. Open or shorted diodes ln.
exciter rotor 1 to 3 diodes.
2. Shorted exciter rotor winding.
1. Faulty voltage regulator.
1. STB pod on regulator
needs adjustment.
1. Diode(s) on exciter rotor
breaking down when load is
applied (inductive) 1-3 diodes.
Engines & Generators
97
4. Open in exciter
stator winding.
5. Open in rotating
field winding.
3. Shorted or open main
stator auxiliary winding.
3. Faulty voltage regulator.
1 •.
2. Faulty voltage regulator.