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Section 4
ENGINE DC CONTROL SYSTEM
PRINTED CIRCUIT BOARD
GENERAL:
The printed board is responsible for cranking, startup,
running and shutdown operations. The board intercon-
nects with other components of the DC control system
to turn them on and off at the proper times. It is pow-
ered by fused 12 VDC power from the unit battery.
CIRCUIT BOARD CONNECTIONS:
The circuit board mounts a 12-pin receptacle (J2) and
a 5-pin receptacle (J1). Figure 4-2 shows the 12-pin
receptacle (J2), the associated wires and the function
of each pin and wire.
DIP SWITCH POSITIONS:
Note: These switches must remain in the positions
set at the factory.
1. Stepper Motor Rotation
a. Switch set to ON for clockwise rotation (Factory
Position).
b. Switch set to OFF for counterclockwise rotation.
2. Frequency Setting
a. Switch set to OFF for 60 Hertz (Factory
Position).
b. Switch set to ON for 50 Hertz.
DIP SWITCH
1) ON
2) OFF
J2 CONNECTOR
J1 CONNECTOR
POTENTIOMETERS
RESPONSE
RECOVERY
DAMPEN
SENSING
LED
21
ON
Figure 4-1. – Printed Circuit Board
TERMINAL WIRE FUNCTION
1 15B 12 VDC input when the Start Stop Relay
(SSR) is energized.
2 83 Ground input when the idle control switch
(SW2) is placed in the closed position
3 TR1 AC voltage input from the idle control
transformers.
4 0 Common ground for the PCB
5 167 12 VDC input when SW1 is placed in the
Start position. Ground input when SW1 is
placed in the Stop position.
6 TR2 AC voltage input from the idle control
transformers.
7 86 Fault shutdown circuit. When grounded
by closure of the Low Oil pressure switch
(LOP) engine will shut down.
8 229 Switched to ground for Start Stop Relay
(SSR) operation.
9 NOT USED
10 44S AC input for frequency control.
11S/44S 240VAC
11 NOT USED
12 11S AC input for frequency control. 11S/44S
240VAC
Note: J1 Connector is utilized for governor control.
Figure 4-2. – Receptacle J2
BATTERY
RECOMMENDED BATTERY:
When anticipated ambient temperatures will be con-
sistently above 32° F. (0° C.), use a 12 volts Type U1
storage battery capable of delivering at least 300 cold
cranking amperes.
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