Sbeg Troubleshootlng - Westerbeke 20.0KW SBEG Operator's Manual

SBEG TROUBLESHOOTING
NOTE:
AC GENERATOR TROUBLESHOOTING MUST
BE PERFORMED WITH THE ENGINE OPERATING AT 60 HZ.
FAULT
PROBABLE CAUSE
NO AC VOLTAGE OUTPUT AT NO LOAD. 1. Short or open in the
main stator winding.
2. Shorted varister
on exciter rotor,
3. Four or more shorted or
open diodes on exciter rotor,
RESIDUAL VOLTAGE PRODUCED AT
NO LOAD 15 • 20 VOLTS AC.
1. Blown 6 AMP fuse
auxiliary circuit feed to AVR.
2. Faulty voltage regulator
LOW AC VOLTAGE OUTPUT AT
NO LOAD 60 ·100 VAC.
1. Reset voltage potentiometer.
2. Open or shorted diodes in
exciter rotor 1 to 3 diodes.
3. Faulty voltage regulator
HIGH AC OUTPUT VOLTAGE
150 VAC OR HIGHER.
1. Faulty voltage regulator.
UNSTABLE VOLTAGE OUTPUT.
1. STB pod on regulator
needs adjustment
AC VOLTAGE DROP UNDER LOAD
60 - 100 VOLTS AC.
1. Diode(s) on exciter rotor
breaking down when load is
applied (inductive) 1·3 diodes.
r - -
---------.,
L_
1
EXCITER I
STATOR I
I
r-----~----------~
I I I
I I I
I EXCITER I ROTOR FIELD I
~_--, I
ROTOR I I
r-
I I I
+
I A I
I S I I
I I
I I
! I
!
,-----1
I I I
L-----
r ---
------~
_ _ _ _ _ _ _ _ _ J
w
.;::>
.....
. "
FUSE
6.3 AMP
RED
t----
---1
I
I
4 I STATOR 13
I I
AUX
I
I
______ I
RED
RED
4. Open in exciter
stator winding.
5. Open in rotating
field winding,
3. Shorted or open main
stator auxiliary winding.
4. Short in rotating field winding.
5. Short in exicter stator.
2. Faulty voltage regulator.
RED
RED
®
W2
®
U1
W1
V1
BLACK
GREEN
BLUE AUXILLIARY CIRCUiT VOLTAGE
215VAC NO LOAD TO Z22VAC FULLY LOADED
EXCITER -CIRCUIT VOLTAGE YELLOW
8.DVDC NO LOAD TO 17.0VDC FULLY LOADED
Engines & Generators
31