Generac Power Systems 7 kW NG Repair Manual page 103

ENGINE/DC CONTROL
POWER
WINDING
44
STATOR
22
POWER
WINDING
ROTOR
EXCITATION
BA
WINDING
0 4 2
6
C1
6 5
4 3
PIN #
0 4 2 6
6
4
0
0
4
GOVERNOR
ACTUATOR
FIELD BOOST
DIODE
56
56
56
85
A
HTO
SCR
86
B
0 0
LOP
0 0
13
BATTERY
12V
0
PART 4
33
11
11 44
OPTIONAL
BATTERY WARMER
240Vac
1
CONNECT
2 1
N1A
OPTIONAL
OIL WARMER
N1B 1
240Vac
11 44
CONNECT
N1
00
6
4
0
11
N1
44
N2
T1
N1 00 2 44
T1 N2
1 2 3 4 5 6 7 8 9
J5
PRINTED CIRCUIT BOARD
F1
J3
1 2 3 4 5 6 7 8 9
90 0 13 818 85 14
817 819 820 210
14
CS
14
FS
14
0
0
SP1
IM1
13 13
SP2
IM2
SCR
16
SC
SM
Figure 98. Utility Voltage Failure and Engine Cranking
CB1
44
11
11
2
N2A
2 N2B
N2
T1A
MOV
0 6
11 4
10 11 12 13 14
Crank Atempt # 1
CONTROLLER
J4
10 11 12 13 14 15 16 17 18 19 20 21 22 23
86 18 56 194
J1
209 23
1K24
56
820
817
818
819
0
18
18
= 12 VDC ALWAYS PRESENT
= AC VOLTAGE
= GROUND
= PCB GROUND CONTROL
= 12 VDC DURING CRANKING ONLY
= 12 VDC DURING ENGINE RUN CONDITION
= DC FIELD EXCITATION
= 5 VDC TO LED
Operational Analysis
CB2
33
22
NEUTRAL
00 00 WHT
N1
N2
T1
11C
00
0
LED BOARD
J1
820 1
2
817
818 3
819
4
209
210
0
194
23
LEGEND
BA - BRUSH ASSEMBLY
CB1 - CIRCUIT BREAKER, MAIN OUTPUT
CB2 - CIRCUIT BREAKER, GFCI
CS - CHOKE SOLENOID
FS - FUEL SOLENOID
F1 - 7.5 AMP FUSE
HTO - HIGH TEMPERATURE SWITCH
IM_ - IGNITION MODULE
LOP - LOW OIL PRESSURE SWITCH
MOV - VARISTOR
SC - STARTER CONTACTOR
SCR - STARTER CONTROL RELAY
SM - STARTER MOTOR
SP_ - SPARK PLUG
Section 4.3
240 VAC
GENERATOR
OUTPUT
240 VAC
UTILITY
INPUT
120 VAC
LOAD SUPPLY
BATTERY CHARGER
120 VAC
ACCESSORY
POWER
OUTPUT
L1
L3
L2
COMMON
ALARM
GROUND
+ BATTERY
TRANSFER
Page 101