Generac Power Systems 5414, 5412 Section ENGINE DC CONTROL SYSTEM, Circuit Condition - Running

Section 5

ENGINE DC CONTROL SYSTEM

CIRCUIT CONDITION – RUNNING:

With the FUEL PUMP (FP) and FUEL SOLENOID (FS) operating and ignition occurring, the engine should start, and the START- STOP SWITCH (SW1) is released. This voltage is delivered to the PCB via Wire 18A to prevent STARTER MOTOR engagement above a certain rpm.

Printed Circuit Board action terminates DC output to the STARTER CONTACTOR RELAY (SCR), which then de-energizes to end crank- ing. PCB action terminates DC output to the CHOKE SOLENOID (CS).

The choke will go to a position determined by the CHOKE HEATER (CH).

The LOW OIL PRESSURE SWITCH (LOP) is normally closed. After startup, engine oil pressure will open the LOP.

+

-

																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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