• (Electronic-governor sets) Leads
81
and
82
to
rectifier
CR
10, to the electric choke, and for
battery charging through R1.
• Leads
01
and
02
to voltage regulator VR1,
wiring harness J4, for excitation
of
rotor. (AC
voltage from stator is rectified
to
DC voltage in
VR1).
The stator mounts inside the generator housing
and is held in position with clamps and capscrews.
A series
of
air
intake openings in
the
end
of
the
housing allow cool
air
to
be
drawn inside
the
hous-
ing for generator cooling.
The
housing
also
pro-
vides a mounting for the engine starter, rear rotor
bearing, exciter brush block, control components,
and fuel pump.
The
complete stator and housing
assembly bolts to
the
engine-to-generator adapter.
Terminal Board (TB1)
The AC output
power
leads from
the
generator
(T1
,
T2, T3,
and
T4) are connected to terminal board
TB1
at terminals L 1 -
LO.
AC
power
at TB1 terminals is tapped
by
leads
of
wiring harness
,.14
of
voltage regulator VR1, and in-
terconnect wiring to circuit breakers C81 and
C82.
These leads provide generator
output
to
the
volt-
age regulator for proper voltage regulation, and
to
the circuit breakers
for
power
supply to load.
Voltage
Regulator
(VR1)
The voltage regulator helps provide stable output
voltage
under
varying loads. During initial start
of
the set, the voltage regulator receives DC current
from
the
starting battery, b-egins excitation
of
the rotor through leads J4-9/F1 , and
J4~
1 O/F2. Af-
ter the
genset
starts and runs, it provides AC
power
to the voltage regulator through leads
J4-
~
1
iQ1
,
and
J4-12/02
for
the
excitation system.
The
AC
voltage is rectified
to
DC voltage,
and
the
proper
DC excitation voltage is conducted
to
the
rotot
in
proportion to
changes
in demand. Reference
volt~
age is
J4-2/L
1 to J4-3/LO.
The voitage regulator
is
protected from
moistur~e
and contamination, {educing
the
risk nom-
'"'"'''"'eo'"l'
failure.
The
capacitor and the printed circuit
regulator housing with a
potting compound. The wiring harness plug-in
P4
is treated with a lubricant prior to connection.
Circuit
Breakers
(CB1
,CB2)
AC
output
from the generator is supplied to circuit
breakers C81 and
C82,
located on the right side
of
the
control housing. Ampere rating
of
these break-
ers
may
differ, depending
on
the set modeVfre-
quency. Refer to
the
proper
Parts Manual when or-
dering replacement parts.
Wiring Harness
to
Load
A wiring harness is provided to connect
the
genset
to
the
electrical system. All leads are stranded cop-
per
wire,
to
withstand vibration. The leads must be
protected with flexible conduit from the set control
housing to the switching/disconnect device, which
must
be
provided by the vehicle manufacturer.
Load conductors are black, neutral conductors are
white, and
the
ground conductor is green.
GENERATOR OPERATION
Refer to
the
wiring diagrams and schematics in
Section
11
while reviewing this text. Always refer to
the wfring diagram/schematic that corresponds to
the specific genset
when
troubleshooting prob-
lems.
When
the
start-stop switch is moved to START,
the
rotating field (rotor) is momentarily connected to
battery positive
(8+)
to provide magnetism for volt-
age build-up. As the engine starts and speed in-
creases,
the
rotating field induces an AC voltage in
the
stator windings. AC voltage from
the
quadra-
ture winding
(01,
02)
is
rectified for field excitation
voltage.
AC
voltage output stabilizes
at
approxi-
mately
128
volts when
the
engine reaches gov-
erned speed.
Voltage regulator
VR1
enables the generator
to
provide a stable
AC
output voltage
under
varying
load conditions. Leads from
VR1
wire harness
J4-2
and -3
are
connected
to
terminal board TB1:
these leads sense voltage changes
of
the
load on
the generator.
The
sensing leads provide reference voltage to
the
voltage regulator, depending on load. voltage
;egulator Increases DC excitation voltage ro-
'mting
field proportionate
to
the
!oad, continuously
field
current
as
load changes,.
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