Generac 86640 - Manual (Page 92)

Section 9.4- ENGINE CONTROL CIRCUIT
Engine Control Circuit Board
An engine control circuit board (Figure 11), noused in the
generator control panel, controls engine starting, running and
shutdown functions. A 12 volts DC power supply is delivered
to the board for control of those functions.
Circuit board terminals, connecting wires and a descrip­
tion (or function) of the wires is listed in the following chart:
TERMINAL WIRE DESCRIPTION OR FUNCTION
1 15 Breaker protected 12 volts DC power
to operate engine control system.
2 0 Common ground.
3 17 Engine will crank when this circuit
is grounded.
4 18 Engine will shut down when this
circuit is grounded.
5&6 11, 22 Frequency (engine speed) signals
from generator AC power leads for
automatic engine shutdown.
7 56 Crank signal- starter contactor
energizes when circuit board
energizes Wire 56 circuit.
8 9 Delivers 12 volts DC to ignition
coil for engine cranking only.
9 14 Delivers 12 volts DC to carburetor
fuel valve, fuel pump and DC alter­
nator for running.
10 RW Once cranking has ended, battery
power Is delivered to the Ignition
coil via a resistance wire.
11 14 Delivers 12 volts DC to a
remote panel only when the
engine is running.
12 85 When this circuit Is grounded by
closure of either (a) a low oil
pressure switch, or (b) a high
coolant temperature switch, an
automatic engine shutdown will
occur
Figure 12. Engine DC Control Circuit
Page 9.4-1