Generac Power Systems Guardian 5410 Repair Manual page 23

CIRCUIT CONDITION – SHUTDOWN:
Setting the START-STOP SWITCH (SW1) or the REMOTE PANEL
START-STOP SWITCH to its "STOP" position connects the Wire
18 circuit to frame ground. Printed Circuit Board action then closes
the circuit to Wire 18A, grounding the ignition magneto. PCB action
de-energizes DC output to j1 plug to the FUEL PUMP (FP), FUEL
SOLENOID (FS) and CHOkE HEATER (CH) are de-energized by the
loss of DC to Wire 14. Ignition and fuel flow are terminated, and the
engine shuts down.
CIRCUIT CONDITION – FAULT SHUTDOWN:
The engine mounts a HIGH OIL TEMPERATURE SWITCH (HTO)
and a LOW OIL PRESSURE SWITCH (LOP).
HTO LOP
0 85 0 86
14
0 CH 14
0
0 SC 16
RED 13
SC
+
BATTERY
12V
SM
-
712
14
BLACK
44
CUSTOMER 22
AC CONNECTION
NEUTRAL CONNECTION
BY CUSTOMER
WHITE GREEN
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 FP
SP1
IM2
SP2
18A 0 241 BLK
CS 90
REMOTE
F1
PANEL
CONNECTOR
A
0
H
B
18
G
C
17
F
D
E
44
22
CB2
11 11S 22S 22
44
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
Should engine oil temperature exceed a preset value, the switch con-
tacts will close. Wire 85 from the Printed Circuit Board will connect to
frame ground. PCB action will then initiate a shutdown and will cause
the red led light on SW1 to flash 6 times then repeat.
Should engine oil pressure drop below a safe pre-set value, the LOP
switch contacts will close. On contact closure, Wire 86 will be connect-
ed to frame ground and PCB action will initiate an engine shutdown
and will cause the red led light on SW1 to flash 5 times then repeat.
The PCB has a built-in time delay for the Wire 85 fault shutdown. At
STARTUP ONLY the circuit board will wait approximately 6 seconds
before looking at the Wire 85 fault shutdowns. Once running, after
the 6 second time delay, grounding Wire 85 through either switch will
cause an immediate shutdown.
J2
CONTROL
PRINTED CIRCUIT BOARD
J1
1 2 3 4 5 6 7 8 9 10 11 12 13 14
17 14 85 56 0 4
18 15 86 712 90 18A
RED
14
712
0 0
0
16
15
13
0 0
18
17
14
712
WHITE
GREEN
11S
22S
CB1
33 6 2 4
DPE WINDING
= 12 VOLTS DC
= ALARM CONTROL (PCB)
= DC CONTROL VOLTAGE (PCB)
= SHUTDOWN CONTROL (PCB)
16
56
2 Flashes = Low Battery
SCR
3 Flashes = Overcrank
56 0 13 16
4 Flashes = Overspeed
5 Flashes = Low Oil Pressure
6 Flashes = High Oil Temperature
56
LED
0
712 712
18
17
17
START
PRIME
0 13 16
0
0
0
11S
22S
4
0 0
6
2
VOLTAGE
REGULATOR
0
FIELD
BA
= AC VOLTAGE
= GROUND
= GROUND CONTROL (PCB)
= FIELD BOOST
= VOLTAGE REGULATOR
DC OUTPUT
Section 5
0
18
STOP
SW1
0
11S
22S
+
4
-
0
6
2
Page 21