TP-6391 9/08 51Section 5 Component Testing and Adjustment
5.7 Voltage
5.7.1 Voltage Regulation
Voltage regulation is performed by the Advanced Digital
Control (ADC) and the SCR module. The ADC monitors
generator output voltage and adjusts the excitation
current to the rotor through the SCR module.
5.7.2 Voltage Adjustment
The factory sets the voltage for correct generator
operation under a variety of load conditions. Usually, the
voltage needs no further adjustment. Adjust the voltage
when necessary according to the following procedure.
The adjustment procedure requires a meter that can
measure voltage and frequency.
Use the ADC controller to adjust the voltage, gain, and
volts/Hz. Refer to Section 4.11.2 for instructions to
adjust each parameter and save the changes using the
controller keypad.
Note: The ADC controller will time out and exit the
adjustment mode after approximately 1 minute if
no buttons are pressed. Any unsaved changes
are discarded if the controller times out before the
settings are saved. Refer to Section 4.11.2 for
instructions to save your settings.
Voltage Adjustment. Adjusts generator output
between 100 and 130 volts.
Gain (Stability) Adjustment. Fine tunes regulator
circuitry to reduce light flicker.
Volts/Hz Adjustment. Determines frequency (Hz) at
which generator output voltage begins to drop.
The controller maintains generator output at the
specified voltage under load until the generator engine
speed drops to a preset level (factory setting 57.5 Hz on
60 Hz models and 47.5 Hz on 50 Hz models). Then the
controller allows the generator voltage and current to
drop. The voltage/current drop enables the engine to
pick up the load. When the generator speed returns to
normal (60 Hz or 50 Hz) as load is accepted, the
generator output also returns to normal.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
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. Ensure you comply with all
applicable codes and standards. Electrically ground the
generator set, transfer switch, and related equipment and
electrical circuits. Turn off the main circuit breakers of all
power sources before servicing the equipment. 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. Connect a digital voltmeter from one side of the
circuit breaker to the LO terminal on the end
bracket casting. See Figure 5-9. Set the meter to
measure voltage.
Note: For 120- or 240-volt systems the voltage
measured from one side of the breaker to
LO should be approximately 120 VAC. For
240-volt systems, the voltage measured
from one side of the circuit breaker to the
other should be approximately 240 VAC.
2. Start the generator set.
3. Follow the controller instructions in Section 4.11.2
to enter the adjustment mode and increase voltage
or decrease voltage (parameter 1P) until the output
reaches the desired voltage.
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