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Page 19 – Generac Power Systems Recreational Vehicle Generator 5413 User Manual

Page 21

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Section 5

ENGINE DC CONTROL SYSTEM

Page 19

SC - STARTER CONTACTOR

TB - TERMINAL BLOCK, 4 TAB

SP2 - SPARK PLUG, CYL. 2

SP1 - SPARK PLUG, CYL. 1

LED - ALARM INDICATOR
LOP - LOW OIL PRESSURE SWITCH

SCR - STARTER CONTACTOR RELAY
SM - STARTER MOTOR

SW1 - PRIME/START-RUN-OFF SWITCH

FS - FUEL SOLENOID

FP - FUEL PUMP

F1 - FUSE, 7.5A

CH - CHOKE HEATER
CS - CHOKE SOLENOID

IMS - IGNITION MODULE STUD

IM2 - IGNITION MODULE, CYL. 2

HTO - HIGH OIL TEMPERATURE SWITCH
IM1 - IGNITION MODULE, CYL. 1

GRD1 - CONTROL PANEL GROUND
GRD2 - UNIT GROUND STUD

BA - BRUSH ASSEMBLY
CB 1 / CB 2 - SEE CHART

LEGEND

= 12 VOLTS DC

= ALARM CONTROL (PCB)

= DC CONTROL VOLTAGE (PCB)

= SHUTDOWN CONTROL (PCB)

= GROUND

= GROUND CONTROL (PCB)

= FIELD BOOST
= VOLTAGE REGULATOR
DC OUTPUT

= AC VOLTAGE

IM1

IM2

SP1

SP2

12

J1

1 2 3 4 5 6 7 8

10

9

11

13 14

PRINTED CIRCUIT BOARD

J2

CONTROL

ACTUATOR

GOVERNOR

SW1

START
PRIME

STOP

18

17

0

SCR

56

16

F1

0

13

16

56

FP

LOP

HTO

BLK

RED

18A

0

86

0

85

REGULATOR

VOLTAGE

2

2

0

6

22S

4

11S

6

0

4

22S

11S

LED

0

712

CH

CS

0

90

14

RED

BLACK

SM

SC

BATTERY

+

-

12V

SC

0

0

16

16

0

13

POWER WINDINGS

11

BA

33

DPE WINDING

6

2

4

0

44

CB2

CB1

FIELD

BLACK

RED

18

17

0

56

712

0

18

11S

22S

13

16

0

17

REMOTE

PANEL

CONNECTOR

14

712

D

E

G

F

C

B

18

17

H

A

0

GREEN

WHITE

0

13

712

14

0

GREEN

WHITE

0

NEUTRAL CONNECTION

AC CONNECTION

CUSTOMER

BY CUSTOMER

18

15

17

712

86

90

14

85

56

0

18A

4

15

11S

0

14

0

241

FS

14

712

22

44

44

22

22S 22

0

0

0

+

-

CIRCUIT CONDITION – CRANkING:
When the START-STOP SWITCH (SW1) or REMOTE PANEL START
SWITCH is momentarily held in the “START” position and then
released, Wire 17 from the Printed Circuit Board (PCB ) is connected
to frame Ground. PCB action will then deliver battery voltage to a
STARTER CONTACTOR RELAY (SCR) via Wire 56, and to an auto-
matic CHOkE SOLENOID (CS) via Wire 14.
When battery voltage energizes the STARTER CONTACTOR RELAY
(SCR), it’s contacts close and battery output is delivered to the
STARTER CONTACTOR (SC) via Wire 16. When the STARTER
CONTACTOR (SC) energizes, it’s contacts close, and battery out-
put is delivered to the STARTER MOTOR (SM) via Wire 16. The
STARTER MOTOR energizes and the engine cranks.

When the STARTER CONTACTOR RELAY (SCR) closes, battery
voltage is also delivered to PCB Pin 13 . This voltage is reduced for
use as field boost and is output from PCB Pin 13 to the rotor. While
cranking, the CHOkE SOLENOID (CS) is energized by grounding
Wire 90 cyclically by PCB action (two seconds on, two seconds off).
Also while cranking, PCB action energizes Pin 5, and delivers battery
voltage to the Wire 14 circuit. This energizes the FUEL PUMP (FP)
via a Red wire, FUEL SOLENOID (FS) via Wire 241 and CHOkE
HEATER (CH) via Wire 14. Battery voltage is also delivered to an
optional light or hour meter in the Remote Panel, if equipped.
PCB action now holds open Wire 18A to common ground, and the
Magneto will induce a spark during cranking.