Circuit Condition - Start - Generac Power Systems 4451 & 4986 Repair Manual

section 4
engine Dc contRol sYsteM
BATTERY CHARGE WINDING
77A
55A
C1-5
C1-3
10A BATTERY CHARGE WINDING
77
C1-10
55
C1-8
77A
77
77
1 0
2 162
ELECTRONIC 3 11S
VOLTAGE
REGULATOR 4 4
5 44S
6 6
0
15B
86
229
0
15B
229
167
83
TB2
TB1
44S 86 167 TR1 15B
11S 229 TR2 0 83
12 11 10 9 8 7 6 5 4 3 2 1
J2 CONTROL
PRINTED CIRCUIT
J1 BOARD
With the Start-Run-Stop Switch (SW1) held in the start position, Wire 17 from the Starter Contactor Relay (SCR)
is now connected to Wire 0 which is frame ground. This allows current to flow and the SCR is energized. The SCR
contacts close connecting Wire 13 battery power to Wire 16. Wire 16 now supplies battery power to the starter
contactor (SC) on the Starter Motor (SM), the SC is energized and its contacts close, battery power is available to
the Starter Motor (SM) and the engine is cranking.
Page 22
POWER WINDING
66A
44
C1-4
44S
C1-2
66
RED
C1-9
44S
66A
I.C.T.
66
44
77A
BCR1
66
13A
77
BLK
162
4
44S
15
86
167
83
18
14
15
18 14 229
0 15B
15
14
4 6 5
SSR
12 10 9
13
15
0 15 15

CIRCUIT CONdITION - START:

2
22 11
11S
C1-1
I.C.
11S 2
I.C.T.
BLK
66A
15
BCR2 12Vdc
CB1
15A 0
2
0
CB2
2
11S
6
0
0
SW2
15
BA
DPE WINDING
FIELD
6 4
C1-6 C1-7 C1-11
6 4
11
22
0
44
0
15
4
6
0
D1
4
15
86
167
15
14
15
15
0
C1-12
0
0
C.B.
30A
0
14
R1
14
86
15
14
18
13
F1
GOVERNOR
ACTUATOR
15
13
SCR
17
0
44A
11
22
0
1
17