Westerbeke 12.5 BTDA - Generator Voltage Adjustment; No-Load Voltage Adjustment; Full-Load Voltage Adjustment

GENERATOR VOLTAGE ADJUSTMENT
NOTE: WESTERBEKE recommends that the following generator
tests and adjustments be performed 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 staned and a momentary
load should be applied to excite the transformer and then
remqved. The voltage produced ~Y 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 notuse .these
· adjustments to compensate for overload corulitions being
placed on the generator/engine (inductive-motor type loads}.
Less of generator herk/speed, the result of overload, will
cause a drop in voltage output.
Shim thickness ofO.OOl 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 TWORED
WIRES
12 STUD
6 AND 12 STUD VOLTAGE HERTZ
CONNECTION 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 sense inc_orrect voltage and cause the generatQr
to produce abnormally high output voltage.
En_gines & Generators
40