Engine Controller Circuit Board, Battery | Generac Power Systems 65

Section 5

ENGINE DC CONTROL SYSTEM

ENGINE CONTROLLER CIRCUIT BOARD

a.To operate the electric Fuel Pump (FP).

b.To energize the Fuel Solenoid.

GENERAL:

The engine controller board 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 15-pin receptacle (J1) and two single pin terminals (J2 and J3, see Figure 5.3). Figure 5-2 shows the 15-pin receptacle (J1), the asso- ciated wires and the function(s) of each pin and wire.

PIN	WIRE	FUNCTION
1	56	Delivers 12 VDC to Starter Contactor (SC)
		while cranking only.
2	90	Delivers 12 VDC to Choke Solenoid coil
		while cranking only. (Two seconds ON, Two
		seconds OFF)
3	—	Not used.
4	18A	Grounds Magneto for Shutdown.
5	—	Not used.
6	17	To Start-Stop switch. When wire is grounded
		by setting Start-Stop switch to “START”,
		engine will crank.
7	17	To Start-Stop switch on optional Remote
		Panel.
8	—	Not used.
9	4	Field Boost DC to Voltage Regulator and to
		Rotor windings.
10	66	Starter Lockout. Prevents cranking while
		engine is running.
11	85	Fault shutdown circuit. When grounded by clo-
		sure of High Oil Temperature or Low Oil
		Pressure Switch engine will shut down.
12	0	Common Ground.
13	16	12 VDC Input to Field Boost circuit while
		cranking only.
14	18	To Start-Stop switch. When grounded by set-
		ting Switch to “STOP” engine shuts down.
15	18	To Start-Stop Switch on optional Remote Panel.

c.To operate the Choke Heater.

d.To the Remote Wire Harness to operate an hourmeter or a light.

2.Wire 15 connects to Terminal J3. This is the power supply (12 VDC) for the circuit board and the DC control system.

Figure 5-3. – Engine Controller Circuit Board

BATTERY

RECOMMENDED BATTERY:

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

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

Figure 5-2. – Receptacle J1

In addition to the 15-pin receptacle (J1), the circuit board is equipped with two single pin terminals (J2 and J3). These terminals may be identified as follows:

1.Wire 14 connects to Terminal J2. During cranking and running, the circuit board delivers battery voltage to the Wire 14 circuit for the following functions:

BATTERY CABLES:

Use of battery cables that are too long or too small in diameter will result in excessive voltage drop. For best cold weather starting, voltage drop between the battery and starter should not exceed 0.12 volt per 100 amperes of cranking current.

Select the battery cables based on total cable length and prevailing ambient temperature. Generally, the longer the cable and the colder the weather, the larg- er the required cable diameter.

Page 24

65, 75, 55 specifications

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Generac Power Systems 65, 55 Engine Controller Circuit Board, Battery, Circuit Board Connections

Models: 65 75 55