FIGURE 7·6. GOVERNOR CONTROLLER BOARD
A4
Governor
Controller
Board (A4)
Governor controller board
A4
is located on
the
gen-
set mounting tray. It accepts inputs from the elec-
tronic ignition module and
the
oil pressure sensor.
B+
and ground connections power the board.
See
Figure 7-6.
Governor controller board
A4
outputs a DC voltage
that drives
the governor actuator, which in turn
moves the carburetor throttle to maintain
an
engine
speed
of
1800 RPM. The inputs from the ignition
module and the
oil pressure sensor can signal
the
governor controller board to shut the engine off
un-
der
the following adverse conditions:
•If
power
(B+) is lost
to
the controller
• If genset speed goes beyond
2700 RPM
7-10
•If
oil pressure switch S2 closes
•If
the signal from the ignition module stops
•If
genset speed goes below 1760
RPM
for 30
seconds
Under
all these circumstances, governor controller
board
A4 shuts down the genset. The governor
controller board is a non-serviceable component.
CONTROL OPERATION
The schematic diagram shown in Figure 7-7 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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