No Load Voltage Adjustment - Westerbeke 7.6 kw EDT Operator's Manual

7.6KW BT GENERATOR SINGLE PHASE
NO-LOAO VOLTAGE ADJUSTMENT
1. Voltage adjustment is made with the generator regulation
being governed by the compound transformer.
2.
Operate the generator, apply a moderate load momentar-
ily and remove it. Note the voltage output from the gen-
erator's
120
volt leg(s),
(230
volt
50
hertz). The no-load
voltage should be between
121-124
volts at
60.0-60.5
hertz
(234-238
volts at
50.0-50.5
hertz).
NOTE: The no-load voltage should be adjusted to the volt·
age produced by the generator once started and a
momentary load slwuld be applied to excite the trans-
former and then removed. The voltage produced by the
generator ofter 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 (I to 3 volts) can
sometimes be accomplished by gently tapping the top of
the laminated steel bar to reduce
~gap,
between the
existing shinls and the transformer co!e.
CHANGING FREqUENCY 50j60Hz
CHANGING FREQUENCY
(DC breaker
must
be
off)
• When changing the generalors
frequency (50160Hz) switch #1
on the Eellboard must be
positloneli: ON. for 50Hz
OFF for 60Hz
DIP SWITCH
ECU SWITCHES
1. Frequency is a direct result of engine/generator speed:
1800
rpm =
60
hertz;
1500
rpm =
50
hertz.
2. To change generator frequency follow the steps below.
a. Confignre the AC terminal block for the desired volt·.
age frequency as shown below. Ensure that the case
ground wire is connected to the correct terminal block
neutral ground stud.
NOTE: The white/green ground wire may be removed in.
those installations where the AC circuit has a separate
neutral and groUad.circuit. This will prevent the unit
jrom being a ground source in the vessel.
b. Start the engine, monitor AC voltage. Adjust no-load
AC voltage output as needed.
c.
After the no-load hertz adjustment is made, the no-load
voltage may need to be readjusted. In most cases, if the
generator was producing the correct no·load voltage at
the previous hertz setting, it would be correct at the
changed hertz setting.
In the event it needs adjustment, adjust the shim thick·
ness under the laminated steel bar of the transformer.
60
hertz: no-load voltage,
121 - 124
volts.
50
hertz: no-load vortage,
234 - 238
volts.
d, Load the generator to the rated amperage output corre-
sponding to the hertz speed of the generator.
Rated Loaded Speed
60
hertz: loaded speed,
59.5 -60.0
Hertz
50
hertz: loaded speed,
49.5 - 50.0
Hertz
Maximum voltage drop acceptable at full rated output
(amps)
60
hertz:
108 - 110
volts
50
hertz:
215- 220
volts
. Should the voltage drop below the proper rate, loaded
excitation can be increased to raise this voltage by
repositioning the connection on the Voltage Connection
:rerminal.
TERMINAL BLOCK WIRING CONNECTIONS
Winding Connections Needed To Obtain The Proper Voltage and Frequency
2
r7I7I7I""' "
l1 110V50 Hz
6 · 5
4 4 9
10
~~:::~:1
230V 50 Hz
6
6 44
9
10
120V 60 Hz
~~
.6. N :
~;!l210
240V 60 Hz
,..y:
WESTERBEKE
Eng/nilS & Generators'
38