Westerbeke 10.0 EGTD Operator's Manual page 40

GENERATOR VOLTAGE ADJUSTMENT
NOTE:
WESTERBEKE recommends that the following generator
tests and adjustments be perfonned by a quailified technician.
NO-LOAD VOLTAGE ADJUSTMENT
Voltage adjustment is made with the generator regulation
being governed by the compound transformer.
1.
The selector switch, if installed, must be in the COMP
position.
2. To confirm no-load voltage, start the generator and apply
a momentary (moderate) load to excite the transformer.
The voltage produced by the generator after the momen-
tary
load is removed is no-load voltage. Note the voltage
output from the generators 120 volt leg(s) (230 volt 50
hertz). The no-load voltage should be between 121-124
volts at 61.5-62 hertz (232- 236 volts at 51.5-52 hertz).
NOTE:
The no-load voltage should be adjusted to the voltage
produced by the generator once started and a momentary
load should be applied to excite the transfonner and then
removed. The voltage produced by the generator after this
momentary load
is
removed
is
no-load voltage.
3. To raise or lower the voltage, shims of varying thickness
(non-conductive material) are placed or removed from
under the steel laminated bar on top of the compound
transformer. The material used for shimming should not
soften at temperatures in the 176° F (80°
C)
range. A
small reduction in no-load voltage (1 to 3 volts) can·some
times be accomplished by gently tapping the top of the ·
laminated steel bar to reduce the gap between the existing
shims and the transformer core.
NOTE:
No-load voltage may be effected needing readjustment
with the compound transfonner. Do not use these
adjustments to compensate for overload conditions being
placed on the generator/engine (inductive-motor type loads).
Loss of generator hertz/speed, the result of overload, will
cause a drop in voltage output.
Shim thickness of 0.001 inch will change the no-load
voltage by approximately 4 - 6 volts. Adding shim
material raises the no-load voltage. Removing shim
material lowers no-load voltage.
FULL-LOAD VOLTAGE ADJUSTMENT
The voltage hertz connection bar that is used when changing
from 60Hz to 50Hz can also be used to increase or decrease
the generators· full-load output.
Fine voltage adjustments can be performed by repositioning
wires
A
to leads #1, #2, and #3 increasing the loaded voltage
progressively in that order. A no-load voltage adjustment will
have to be made as well.
Should
full~load
output fall below 108 volts-60Hz
(210 volts-50Hz), the voltage should be adjusted.
A
TWO RED
WIRES
12 STUD
6 AND 12 STUD VOLTAGE HERTZ
CONNECnON BARS
NOTE:
When the optional voltage regulator is installed
and
if
the Blue/White (Blue) lead is not correctly positioned
to correspond to the Hertz the unit is operating at, the
regulator will
se~e incorrect voltage and cause the generator
to produce abnormally high output voltage.
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34