Component Resistance Values - Westerbeke 11.5KW-60Hz Service Manual

BT GENERATOR TROUBLESHOOTING/SINGLE PHASE
TESTING THE
BRIDGE RECTIFIER
4. Leaving the negative (-) ohmmeter lead on point #4,
touch point #5 with the positive
(+)
lead. No deflection of
the needle should occur.
5. Place the positive
(+)
lead of the ohmmeter on point #1
and.the negative (-) lead on point #3. The ohmmeter
should not register any deflection of the needle (no
deflection indicates infinite resistance). Reverse these
connections and the ohmmeter should again register no
deflection.
If the rectifier fails any of the previous tests (1 - 4) it is
defective and should be replaced.
NOTE:
Different style/model meters may produce opposite
results from the above tests:
Component Resistance Values
A. Exciter Stator
A-I &A-2 11.5 ohm
A-I 49.4 ohm
B. Excitor RotorlFieId
B-1 1.05 ohm,
B-3 8.90hm
A-2 12.9 ohm
C. Main Stator .
Col 0.089 ohm
C-2 0.089 ohm
Aoxlliary Windings
C-3 0.85 ohm·
D. Compound Transformer
D-l 0.007 ohm
r-------------------,
A
I B :
,
,
- +1
'00:
II
:*
4
i
I
b
I
I
1
2 3
I
~----~------------~
D-2 0.007 ohm
Auxiliary Windings
D-3 5.020hm
c
I I
2
! !
D
E •. · A.C. Terminal Board
G. Bridge Rectifier
F. Selector Switch
H,OptionaI
A~
The model code number is found stamped in the generator
housing on a flat surface above the rear generator carrier
bearing.
NOTE: These two model BT generators are used on models
rated lower than the capabilities ojthe generator. However,
the generator is rated according to the capabilities oj the
drive engine since horsepower produces kilowatts.
COMPONENT RESISTANCE CHECKS
Exciter Stator Windings
1. Windings A-I andA·2
Resistance readings for exciter windings A-I and A-2
with the selector switch in the COMP position are taken
between the positive
(+)
and negative (-) leads
lifted
off
the bridge rectifier
(G).
Neither of these two leads should
have the continuity to the generator case/ground.
2. WindingA·l
Resistance readings for exciter windings A-I with the
selector switch in the ELEC position is taken between the
yellow wire and the black at the A.V.R. plug (G).
3. WindingA·2
Resistance readings for exciter winding A-2 with the
selector switch in the ELEC position is taken between the
green wire lifted off the negative (-) terminal of the bridge
rectifier
(G)
and the red wires lifted off the positive
(+)
terminal of the bridge rectifier
(G),
NOTE:
The white striped wiring on earlier model generators
has
been changed to solid colors on current generators, the
colors, however, remain the same.
2
1
E
.2
;,
W2
.,
"
V1
'3
.s
RE.
GREEN
...
--
....
BLUEfWHIfE
(TOPINlaTERM.
+
,
, YELlOW
I
alACK
YELL""
IlLACK
REDI WHITE
(l'O HERTZ/VOcrs BAR)
Sl-UE !WHITE
(TOHERTZIVOLTSBAR)I::::;i(S~R:j
!!J~!!!
m ..
60eyc.
50cyc:
BLACJ((WHrrE
{TO BRIDGE RECTIFIER)
BT GENERATOR
. INTERNAL WIRING
SCHEMATIC
(W/OPTIONAL AVR)
+
AVR
PLUG
BLACK/WHITE
(TO SELECTOR SWITCH)
YELLOW (WHITE
{TO SELECTOR SWITCH)
Engines & Generators
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