Engine Dc Control System; Introduction; Operational Analysis - Generac Power Systems Guardian 5410 Repair Manual

Section 5

ENGINE DC CONTROL SYSTEM

INTROdUCTION

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

HTO LOP
0 85 0 86
0 CH
0
0 SC
RED
SC
+
BATTERY
12V
SM
-
BLACK
44
CUSTOMER
AC CONNECTION
NEUTRAL CONNECTION
BY CUSTOMER
WHITE
LEGEND
BA - BRUSH ASSEMBLY
CB 1 / CB 2 - SEE CHART
CH - CHOKE HEATER
CS - CHOKE SOLENOID
F1 - FUSE, 7.5A
FP - FUEL PUMP
FS - FUEL SOLENOID
GRD1 - CONTROL PANEL GROUND
GRD2 - UNIT GROUND STUD
HTO - HIGH OIL TEMPERATURE SWITCH
IM1 - IGNITION MODULE, CYL. 1
Page 18
GOVERNOR
ACTUATOR
IM1 FS
SP1
IM2
SP2
18A 0 241 BLK
14 CS 90
14
16
13
REMOTE
F1
PANEL
CONNECTOR
A
0
H
B
18
G
C
712 17
F
D
14
E
44
22
CB2
22
11 11S 22S 22
GREEN RED BLACK
POWER WINDINGS
IM2 - IGNITION MODULE, CYL. 2
IMS - IGNITION MODULE STUD
LED - ALARM INDICATOR
LOP - LOW OIL PRESSURE SWITCH
SC - STARTER CONTACTOR
SCR - STARTER CONTACTOR RELAY
SM - STARTER MOTOR
SP1 - SPARK PLUG, CYL. 1
SP2 - SPARK PLUG, CYL. 2
SW1 - PRIME/START-RUN-OFF SWITCH
TB - TERMINAL BLOCK, 4 TAB
CIRCUIT CONDITION – REST:
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
CONTROL
PRINTED CIRCUIT BOARD
FP
J1
1 2 3 4 5 6 7 8 9 10 11 12
17 14 85 56 0
18 15 86 712 90
RED
14
712
0 0
0
16
15
13
0 0
18
17
14
712
WHITE
GREEN
11S
22S
CB1
33 6 2
44
DPE WINDING
= 12 VOLTS DC
= ALARM CONTROL (PCB)
= DC CONTROL VOLTAGE (PCB)
= SHUTDOWN CONTROL (PCB)
.
16
56
SCR
56 0 13 16
13 14
4
18A
56
0
712 712
18
17
START
PRIME
0 13 16
0
0
0
4 0
FIELD
BA
= AC VOLTAGE
= GROUND
= GROUND CONTROL (PCB)
= FIELD BOOST
= VOLTAGE REGULATOR
DC OUTPUT
LED
0
18
17
STOP
SW1
0 0
11S
11S
22S 22S
+
4 4
-
0 0
6 6
2 2
VOLTAGE
REGULATOR