Generac Power Systems Guardian 5410 Repair Manual page 22

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.
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 20
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
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
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