Circuit Board Connections - Generac Power Systems 941-2 Service Manual

GENERAL
The A6060 circuit board controls all phases of engine
operation including cranking, starting, running and
shutdown.
The circuit board interconnects with other compo-
nents of the engine electrical system.
The board Is powered by fused 12 VDC battery out-
put, available to the board via Wire 15.
Figure 1. A6060 Circuit Board

CIRCUIT BOARD CONNECTIONS

RECEPTACLE J1:
The A6060 circuit board mounts an 8-pin receptacle
J1. An 8-pin connector plug connects to the A6060.
This harness then connects to a 9-pin connector plug
on the outside panel of the control box. This becomes
the 9-wire harness that connects to the inverter.
Signals from the A6060 circuit board control the func-
tions of the inverter.
RECEPTACLE J2:
The A6060 circuit board mounts a 10-pin receptacle
J2. A 10-pin connector plug connects to this recepta-
cle to interconnect the board with other components
and circuits.
This 10-pin receptacle is shown in Figure 2, along
with a chart that Identifies each pin, wire and function.
Wire 14 connects to Terminal J2-9. This terminal and
wire are electrically hot (12 volts DC) only when the
engine is cranking or running. Battery voltage is deliv-
ered to Terminal J2-9 when circuit board action ener-
gizes a board-mounted run relay while cranking or
running.
Wire 14 DC output is delivered to (a) the engine fuel
pump and (b) the engine ignition system. If an option-
al remote panel Is used, Wire 14 DC output will turn
on a "RUN" lamp on that panel.
Wire 15 connects to Terminal J2-5. This Is fused bat-
tery voltage. The Wire 15 circuit is electrically hot at
all times (provided the unit battery Is connected).
Figure 2. Receptacle J2
PIN WIRE FUNCTION
1 — Not Used
2 18
3 85 When grounded by Low Oil Pressure or High
Oil Temperature Switch, the circuit board will
shut down the engine
4 17 When Wire 17 is connected to ground by
holding Start-Run Stop Switch at START,
cranking will occur.
5 15 Fused battery voltage. The Wire 15 circuit is
electrically hot at all times (provided the unit
battery is connected).
6 0 Common frame ground.
7 90 Delivers 12 VDC to automatic choke solenoid
coil while cranking only.
8 56 Delivers 12 VDC to starter contactor while
cranking only.
9 14 Delivers 12 VDC (during cranking and run
ning) to (a) Engine Fuel System, (b) Engine
Ignition System and (c) Remote Panel Lamp
if so equipped.
10 — Not Used
NOTE 1: - See "SHUTDOWN FEATURES" In
Section 6.5 (Page 6.5-1).
RECEPTACLE J3:
The A6060 circuit board mounts a 6-pin receptacle
J3. A 6-pin connector plug connects to the A6060.
This harness then connects to Stepper Motor. Signals
from the A6060 circuit board control the Stepper
Motor operation. Refer to page 3.6-1 for test proce-
dures.
Section 6.2
A6060 CIRCUIT BOARD
(continued)
Page 6.2-1