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SBEG TROUBLESHOOTING
NOTE: AC
GENERATOR TROUBLESHOOTING MUST
BE PERFORMED WITH THE ENGINE OPERATING AT 60 HZ.
--_________
~F~AU~~~J
________________________
~P~R=OB=A=B~LE~C~A=US~E~
______________ _
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
4. Open in exciter
stator winding.
5. Open in rotating
field winding.
_ _____
open diodes on exciter rotor.
-----------------------~------------------------------
N
ROESL'DUAL VOLTAGE PRODUCED AT
DAD 15 - 20 VOLTS AC.
1. Blown 6 AMP fuse
auxiliary circuit feed to AVR.
3. Shorted or open main
stator auxiliary winding.
_____________________________________
2_._F_au_I~~vO_It_a~ge_r_eg~u_la_to_r
______________________________ __
N
LOO W AC VOLTAGE OUTPUT AT
LOAD 60 -100 VAC.
H(GHAt
1. Reset voltage potentiometer.
2. Open or shorted diodes in
exciter rotor 1 to 3 diodes.
3.
Faul~
voltage regulator
1.
Faul~
voltage regulator.
4. Short in rotating field winding.
5. Short in exicter stator.
150 VAC
8UlCH~lN.LTAGE
----~-----------------------------------------------------------
UNSTABLE VOLTAGE OUTPUT.
1. STB pod on regulator
needs adjustment.
2.
Faul~
voltage regulator.
----------------------------------------------------------------------
:~
VOLTAGE DROP UNDER LOAD
- 1 00 VOLTS AC.
1. Oiode(s) on exciter rotor
breaking down when load is
applied (inductive) 1-3 diodes.
r - _
----------"1
EXCITER
STATOII
r-----~----------~
I
I
I
I
I
1
I
EXCITER
I
ROTOR FIELD
I
-------1
RED
I
I
I
I
I
I
I
I
I
I
I
I
I
r----,
I
R01UR
I
+
1
+
I
1
1
I
A
1
1
sl
ill-
1
1
I
4 I
STATOR
I 3
RED
I
I
I
I
L
:
c
(6)
:
I
1
r----'
I
DIODES
1
L-----r----------~
_ _ _ _ _ _ _ _ _ .J
®
W2
®
U1
GREEN
BLUE
AUXILLIARY CIRCUIT VOLTAGE
215VAC NO LOAD TO 222VAC FULLY LOADED
8. 0WC NO LOAD TO 17.0VDC FULLY LOADED
Engines & Genera/ors
31
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