8203
windings,
is
fed to the voltage reg u lator
as
a reference
voltage
for
maintaining the generatoroutput voltage.
The AC reference voltage' is converted to DC by a
silicon controlled rectifier bridge on the voltage
regulator printed
circuit
board and
fed
into the exciter
field windings. The exciter armature produces three-
phase AC voltage that
is
converted· to DC by the
rotating rectifier assembly. The resultant DC voltage
excites
the generator rotor winding
to
produce the
stator output voltage for the AC load.
The generator
rotor
also produces AC voltage in the
charging winding of the stator which is converted
to
direct current
for
battery charging.
VOLTAGE
REGULATOR
LOCATION
WIO
VOLTAGE
ADJUST
(OPTIONAL).
FIGURE 2. VOLTAGE REGULATOR ASSEMBLY
5
VOLTAGE REGULATOR
The line-voltage regulator on the J-series generator
sets
isan
all solid state device; that is, no relays
or
tubes are needed. Basic components
of
the voltage
regulator are:
• Printed circuit board
VR21
• Voltage reference transformer
T21
• Commutating reactor
CMR21
• Field circuit breaker
CB21
• Voltage adjust rheostat
R22
(Optional)
Figure 2 shows the above components
in
a typical
control box,
on
standard air-cooled
electric.
generating sets.
CONTROLS
The standard control box has a battery charge rate
ammeter, a START-STOP switch, and field circuit
breaker on the control panel, Figure
3.
Optional
controls that may be added on the housed units
or
separate boards include a fault lamp, a' frequency
meter, a running time
meter,
an
overspeed indicator, a
high temperature indicator, a volt adjust knob, a
phase selector, and
AC
voltmeters.
. FIGURE 3. TYPICAL CONTROL PANEL.
FIELD
CIRCUIT
BREAKER
STADT
.CT('P_-'
. SWITCH
DC
AM'1ETER
FAULT
LAMP
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