7-4 Component Testing and Adjustment TP-5648 8/93
Voltage Regulator
Powerboostä V
The voltage regulator used on these models is
PowerBoostä V. See Figure 7-3.
8
7
6
5
4
3
2
1
Figure 7-3. PowerBoostä V Voltage Regulator
The PowerBoostä V voltage regulator monitors output
voltage magnitude to control current to the generator
exciter field. The voltage regulator has an
underfrequency unloading feature which is referred to
as Volts-per-Hz (V/Hz). To determine if the voltage
regulator is functioning properly, reduce engine speed
(Hz) and watch for a corresponding drop in AC voltage.
AC voltage should remain constant until engine speed
drops below 57.5 Hz (on 60 Hz models) or 47.5 Hz ( on
50 Hz models). When frequency drops below 57.5/47.5
Hz, AC voltage should decline. To further check the
voltage regulator for proper function, perform the
following test to check regulator output. To test the
voltage regulator the following components will be
needed:
D Step-up Transformer, 1:2, 120 to 240 Volts (1.0
Amp. minimum)
D Variable Transformer, 0--140 Volts (1.0 Amp.
minimum)
D 120 Volt, 100 watt Lamp
D AC Voltmeter 250 Volt (minimum)
D 1 Amp. Fuse
D 1 SPST Switch, 1 Amp. (minimum)
D 120 Volt AC Plug
D #14 AWG Copper Wire (minimum)
WARNING
Hazardous voltage.
Do not operate generator set without all guards
and electrical enclosures in place.
Moving rotor.
Can cause severe injury or death.
Hazardous voltage 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 adjustments are
made. Remove wristwatch, rings, and jewelry that can
cause short circuits.
Hazardous voltage can cause severe injury or
death. Perform electrical service only as prescribed in
equipment manual. Be sure that generator is properly
grounded. Never touch electrical leads or appliances
with wet hands, when standing in water, or on wet
ground as the chance of electrocution is especially
prevalent under such conditions. Wiring should be
inspected at the interval recommended in the service
schedule--replace leads that are frayed or in poor
condition. The function of a generator set is to produce
electricity and wherever electricity is present, there is
the hazard of electrocution.
Hazardous voltage can cause severe injury or
death. The heat sink of the voltage regulator contains
high voltage. Do not touch voltage regulator heat sink
when testing or electrical shock will occur.
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