Circuit
Breakers (CB1
and
CB2)
AC output from the generator is supplied to circuit
breakers
CB1
and CB2, located on the right side
of
the control housing.
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, and begins excitation
of
the rotor through leads J4-9/F1 , and J4-1
O/F2.
Af-
ter the generator set starts and runs, it provides AC
power to the voltage regulator through leads
J4-11 /Q 1 , and J4-12/Q2 for the excitation system.
The AC voltage is rectified to DC voltage, and the
proper
DC
excitation voltage is conducted to the ro-
tor in proportion to changes in demand. Reference
voltage is J4-2/L 1 to J4-3/LO.
The voltage regulator is protected from moisture
and other contamination, reducing the risk of com-
ponent failure. The capacitor and the printed circuit
board are encased in the regulator housing with a
potting compound. The wiring harness plug-in P4
is treated with a lubricant prior to connection.
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
J4
of voltage regulator VR1, and in-
terconnect wiring to circuit breakers
CB1
and CB2.
These leads provide generator output to the volt-
age regulator for proper voltage regulation, and to
the circuit breakers for power supply to load.
CONTROL OPERATION
The schematic diagram shown in Figure 7-2 is in-
tended as an illustration
of
the circuit description.
However, when troubleshooting, always refer to the
wiring diagram that corresponds to the model and
spec numbers of the generator set.
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