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.

 

POTENTIOMETERS

 

RESPONSE

RECOVERY

DIP SWITCH

DAMPEN

 

 

1) ON

 

SENSING

2) OFF

 

 

LED

 

 

 

2

 

 

1

 

 

ON

 

J2 CONNECTOR

 

 

J1 CONNECTOR

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.

Figure 4-1. – Printed Circuit Board

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Guardian Technologies 4583, 4582 & 4987, 5308 Printed Circuit Board, Circuit Board Connections, Recommended Battery

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