Generac Power Systems 8 kW LP - Manual (Page 112)

CONTROLLER DISPLAY
Running - Utility Lost
= 12 VDC ALWAYS PRESENT
= AC VOLTAGE
= GROUND FOR CONTROL PURPOSES
= 12 VDC DURING CRANKING ONLY
= 12 VDC DURING ENGINE RUN CONDITION
= DC FIELD EXCITATION
= 5 VDC TO LED
0
4
4
0
BA
6
11
22
6
2
2
REGULATOR
11
2
6
0
4
22
VOLTAGE
4 0
0
13
13
18
SP2
IM2
16
13
SCR
0 0
86 85
HTO LOP
18
0
13
12V
BATTERY
SCR
SM
IM1
SP1
44
11
POWER
WINDING
33
22
WINDING
POWER
STATOR
4
0
56
0
SC
820
817
818
819
819
818
817
820
L2
L1
LED BOARD
4
3
2
1
4
ACTUATOR
GOVERNOR
14
14
90
OUTPUT
GENERATOR
240 VAC
NEUTRAL
INPUT
UTILITY
240 VAC
TRANSFER
+ BATTERY
GROUND
56 0 15B 23
23
0
0
FS
BATTERY WARMER
OPTIONAL
N1
00
22
33
11
44
CB
15B
14
0
0
CS
N2 N1
2 1
N2 N1
18
13
86
85
4
3
2
1
18 17 16 15 14 13 12 10 9 11 8 6 7 4 3 5
CB - CIRCUIT BREAKER, MAIN OUTPUT
HTO - HIGH TEMPERATURE SWITCH
FS - FUEL SOLENOID
LEGEND
SCR - STARTER CONTROL RELAY
SC - STARTER CONTACTOR
CS - CHOKE SOLENOID
LOP - LOW OIL PRESSURE SWITCH
SM - STARTER MOTOR
BA - BRUSH ASSEMBLY
IM_ - IGNITION MODULE
SP_ - SPARK PLUG
0
J3
J1
PRINTED CIRCUIT BOARD
TO
PCB
7.5 AMP FUSE
SELF RESETTING FUSE
CONTROLLER
J2
Page 110
enGine Startup and runninG
With the fuel solenoids open and ignition occurring, the engine starts. Engine startup and running may be briefly
described as follows:
• Voltage pulses from the ignition magnetos are delivered to the circuit board via Wire 18. Once the circuit board
determines that the engine is running, the circuit board (a) terminates cranking, and (b) terminates the choke
solenoid (CS), and (c) turns on an “engine warm-up timer”.
Part 4 DC CONTROL
sEctioN 4.2
oPEratioNal aNalYsis