TP-5982 4/0654 Section 8 Reconnection/Adjustments
8.3.4 Adjusting the Voltage, Gain,
Volts/Hz, and Engine Speed
After setting the system voltage, check the output
voltage and adjust, if necessary, using the following
procedures. Follow the instructions in Figure 8-14 to
adjust the voltage, gain, volts/Hz, and governor gain
while the engine is running. An X in the Display column
in Figure 8-14 indicates a number from 0 to 9. Use the
up arrow to increase a setting or the down arrow to
decrease the setting. Pressing the Select button when
SAVE is displayed returns to the first parameter, voltage
adjust (1P).
Note: A digital multimeter that measures voltage and
frequency is required for these adjustments.
8.3.5 Voltage Adjustment
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving rotor.
WARNING
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death. Electrocution is possible
whenever electricity is present. Turn off the main circuit
breakers of all power sources before servicing the equipment.
Configure the installation to electrically ground the generator
set, transfer switch, and related equipment and electrical
circuits to comply with applicable codes and standards. Never
contact electrical leads or appliances when standing in water
or on wet ground because these conditions increase the risk of
electrocution.
Voltage Adjustment Procedure
1. With the generator set off, connect a digital
voltmeter to the output leads or an electrical outlet
on the load side of the generator set. Set the meter
to measure voltage.
2. Start the generator set by moving the generator set
master switch to the RUN position.
3. Use the ADC controller to adjust the voltage
(parameter 1P) until the output voltage reaches the
desired value. See Figure 8-10.
Measured
Voltage, VAC
Approximate
Voltage Change per Step, VAC
Coarse Adjust Fine Adjust
85--132 5 0.5
180--251 7 0.7
Figure 8-10 Voltage Adjustment
4. Adjust the voltage stability (gain, parameter 2P) to
minimize light flicker.
5. Readjust the voltage, if necessary.
6. Adjust the volts/Hz (parameter 3P) until the voltage
level measured by the voltmeter begins to drop.
When the volts/Hz is set correctly, the generator
(as load is applied) attempts to maintain normal
output until the engine speed drops below the
cut-in frequency.
7. Readjust the voltage stability (gain, parameter 2P),
if necessary.
8. Readjust the voltage (parameter 1P), if necessary.
9. Stop the generator set.
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