Generac Power Systems Guardian 5410 Repair Manual page 21

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.
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
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
ENGINE DC CONTROL SYSTEM
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.
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)
56 16
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
Section 5
LED
0
18
17
STOP
SW1
0 0
11S
11S
22S 22S
+
4 4
-
0 0
6 6
2 2
VOLTAGE
REGULATOR
Page 19