Generac Power Systems 5413 Section ENGINE DC CONTROL SYSTEM, Introduction, Operational Analysis

Section 5

ENGINE DC CONTROL SYSTEM

Introduction

CIRCUIT CONDITION – Rest:

The engine DC control system includes all com- ponents necessary for the operation of the engine. Operation includes rest, priming, cranking, starting, running and shutdown. The system is shown sche- matically.

Operational Analysis

Battery voltage is available to the Printed Circuit Board (PCB) from the vehicle BATTERY via the positive (RED) battery cable to the isolated positive (RED) terminal stud, located in the control panel. The power is supplied to Wire 13, a 7.5 amp FUSE (F1), the STARTER CONTACTOR RELAY (SCR) and Wire 15/Pin 4 on the PCB. However, PCB action is holding the circuits open, and no action can occur.

Printed Circuit Board action (only) allows voltage to be supplied to Wires 17 and 18 for start and stop actions on the START-STOP SWITCH (SW1) and remote panel connector.

+

-

																J2												56	16
					GOVERNOR
						ACTUATOR																						SCR
																			CONTROL
																PRINTED CIRCUIT BOARD											56	0	13	16
HTO			LOP
						IM1				FS			FP
					SP1										J1
														1	2	3	4	5	6	7	8	9	10	11	12	13	14
						IM2										17		14		85		56		0		4
					SP2										18		15		86		712		90				18A
0	85	0	86					18A	0		241	BLK		RED
																											56				LED
																											0
																											712			712		0
																											18
																											17				18
				14	CS	90																								START	17
																														PRIME	STOP
																		14			712										SW1
0		CH		14																								0	13	16	0	0
0														0										0
																						0						0
0		SC		16										16
RED				13										15
					REMOTE					F1
		SC			PANEL
BATTERY					CONNECTOR									13
							A	0						0										0						0
12V						H
		SM					B	18						18
						G
					712		C	17						17
						F
					14	E	D
BLACK
														14
														712
																WHITE
																GREEN
																	11S														11S	11S
																	22S														22S	22S
								44																							4	4	+
								22																						0	0	0	-
																															6	6
														CB1																	2	2
			44					CB2																							VOLTAGE
	CUSTOMER			22																										REGULATOR
AC CONNECTION
NEUTRAL CONNECTION									11	11S	22S	22	44	33			6						2			4				0
BY CUSTOMER
			WHITE	GREEN		RED	BLACK				POWER WINDINGS							DPE WINDING										FIELD
																												BA

LEGEND
BA - BRUSH ASSEMBLY	IM2 - IGNITION MODULE, CYL. 2
CB 1 / CB 2 - SEE CHART	IMS - IGNITION MODULE STUD
CH - CHOKE HEATER	LED - ALARM INDICATOR
CS - CHOKE SOLENOID	LOP - LOW OIL PRESSURE SWITCH
F1 - FUSE, 7.5A	SC - STARTER CONTACTOR
FP - FUEL PUMP	SCR - STARTER CONTACTOR RELAY
FS - FUEL SOLENOID	SM - STARTER MOTOR
GRD1 - CONTROL PANEL GROUND	SP1 - SPARK PLUG, CYL. 1
GRD2 - UNIT GROUND STUD	SP2 - SPARK PLUG, CYL. 2
HTO - HIGH OIL TEMPERATURE SWITCH	SW1 - PRIME/START-RUN-OFF SWITCH
IM1 - IGNITION MODULE, CYL. 1	TB - TERMINAL BLOCK, 4 TAB

= 12 VOLTS DC	= AC VOLTAGE
= ALARM CONTROL (PCB)	= GROUND
= DC CONTROL VOLTAGE (PCB)	= GROUND CONTROL (PCB)
= SHUTDOWN CONTROL (PCB)	= FIELD BOOST
	= VOLTAGE REGULATOR
	DC OUTPUT

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