TP-5737 5/01
119
Section 9 Wiring Diagrams
Note: Position the current transformers with the
dot or HI side CT marking toward the
generator set.
Note: Only generator sets equipped with AC meter
controllers and/or safeguard circuit
breakers require CTs.
4. If the controller has meters, remove the controller
cover and reposition the meter scale lamp jumper
(see Figure 9-22) matching the position of the
desired voltage (shown in Figure 9-20 or
Figure 9-21).
TP-5353-6
1
1. Lamp jumper
Figure 9 -22 Meter Scale Lamp Jumper
5. The overvoltage shutdown is standard on
Decision-Makert 3+ controllers. The 139/240
volt (low wye) and 277/480 volt (high wye),
3-phase, 4-wire, 60 Hz configurations use different
overvoltage shutdown settings than all other
configurations. Recalibrate the overvoltage
shutdown if the reconnection changes the voltage
to or from one of these configurations. See
Section 9.2, Overvoltage Shutdown Adjustment.
Do not recalibrate the overvoltage adjustment for
other voltage changes.
6. If the controller has meters, set the phase selector
switch to the L1-L2 position (1-phase or 3-phase
configuration depending on generator set
connection). Connect a voltmeter across leads L1
and L2 if the controller has no meters.
Note: Equipment d amage. Verify that the voltage
ratings of the transfer switch, line circuit
breakers, and other accessories match the
desired line voltage.
7. Reconnect the starting battery, negative (--) lead
last. Place the generator set master switch in the
RUN position to start the generator set. Observe
the voltmeter and verify that the unit has the
desired line voltage.
Adjust the voltage using the voltage adjustment
potentiometer on the generator controller front
panel. See Figure 9-23.
8. Stop the generator set after completing the voltage
adjustment.
9. Disconnect the external voltmeter if used. Replace
the controller cover.
ADV-5849 P1
1. Voltage adjustment potentiometer
1
Figure 9 -23 Voltage Adjustment Potentiometer on
Controller
x:gr:001:002:a
9.2 Overvoltage Shutdown
Adjustment
The 139/240 volt (low wye) and 277/480 volt (high wye),
3-phase, 4-wire, 60 Hz configurations use different
overvoltage shutdown settings than all other
configurations. Recalibrate the overvoltage shutdown if
the reconnection changes the voltage to or from one of
these configurations. Do not recalibrate the
overvoltage adjustment for other voltage changes.
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