Section 5

ENGINE DC CONTROL SYSTEM

Printed Circuit Board

GENERAL:

The Printed Circuit Board (PCB) mounted inside the generator control panel is responsible for crank- ing, startup, running and shutdown operations. The board interconnects with other components of the DC control system to turn them on and off at the proper times. It is powered by fused 12 VDC power from the unit battery.

CIRCUIT BOARD CONNECTIONS:

The circuit board mounts a 14-pin receptacle (J1) and a six pin terminal (J2, see Figure 5-2). Figure 5-1 shows the 14-pin receptacle (J1), the associated wires and the function(s) of each pin and wire.

PIN

WIRE

FUNCTION

 

 

 

1

N/A

NOT USED

 

 

 

2

18

To Start-Stop switch. When grounded

 

 

by setting Start-Stop switch to “STOP”

 

 

engine shuts down

 

 

 

3

17

To Start-Stop switch. When grounded by

 

 

setting the Start-Stop switch to “START”

 

 

the engine start cycle begins.

 

 

 

4

15

Delivers fused 12 VDC to PCB

 

 

 

5

14

PCB control. During cranking and running,

 

 

supplies 12 VDC to fuel pump, choke

 

 

solenoid, choke heater, fuel solenoid

 

 

 

6

86

Low Oil Pressure switch / Safety shut-

 

 

down

 

 

 

7

85

High Temperature switch / Safety shut-

 

 

down

 

 

 

8

712

PCB control/Alarm led

 

 

 

9

56

Delivers 12 VDC to Starter Contactor

 

 

(SC) (cranking only)

 

 

 

10

90

To Choke Solenoid. When grounded by

 

 

the PCB the choke operates at two sec-

 

 

onds ON , two second OFF intervals

 

 

(cranking only)

 

 

 

11

0

Common Ground

 

 

 

12

N/A

Not Used

 

 

 

13

4

Field Boost DC to the Voltage Regulator

 

 

and to the Rotor Winding

 

 

 

14

18A

Ground to Magneto for Shutdown

 

 

 

Figure 5-1. – Receptacle J1

CIRCUIT BOARD Dip Switches:

The circuit board mounts a pair of dip switches which are factory set in the “OFF” (down) position. These dip switches should remain in the factory setting.

J1 CONNECTOR

DIP SWITCH

 

 

 

1 2

1 2

 

SIX PIN

 

J2 CONNECTOR

 

 

 

DIP SWITCHES ARE FACTORY

 

SET IN THE “OFF” (DOWN) POSITION

Figure 5-2. – Printed Circuit Board

1

6

10

2

7

11

3

8

12

4

9

13

5

 

14

Figure 5-3. – J1 Connector, Harness End

Battery

RECOMMENDED BATTERY:

When anticipated ambient temperatures will be con- sistently above 32° F (0° C), use a 12 volts automotive type storage battery rated 70 amp-hours and capable of delivering at least 400 cold cranking amperes.

If ambient temperatures will be below 32° F (0° C), use a 12 volt battery rated 95 amp-hours and having a cold cranking capacity of 400 amperes.

BATTERY CABLES:

Use of battery cables that are too long or too small in diameter will result in excessive voltage drop. For best

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Generac Power Systems 5412, 5411 Printed Circuit Board, Circuit Board Connections, Recommended Battery, Battery Cables

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