Operational Analysis; Circuit Condition - Rest - 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
Battery voltage is supplied to components of the control system from the unit BATTERY via the RED battery cable
connected to the contacts of the starter contactor (SC), wire 13, a 10 Amp fuse (F1), and Wire 15.
Wire 13 is unfused battery supply voltage and is connected to the contacts of the Starter Contactor Relay (SCR).
Wire 15 12 VDC fused battery supply voltage is supplied to the SCR coil, it goes through the coil and comes out
as wire 17 12 VDC, wire 17 is connected to the Start-Run-Stop switch (SW1) and is held open to ground. No cur-
rent flows through the circuit and the SCR is de-energized.
Wire 15 12 VDC fused battery supply voltage is supplied to SW1 and is held open to Wire 167.
Wire 15 12 VDC fused battery supply voltage is supplied to the Start-Stop Relay (SSR) it goes through the coil
and comes out as wire 229 12 VDC, wire 229 is connected to the printed circuit board and is held open to ground.
No current flows through the circuit and the SSR is de-energized.
Page 20
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 - REST:

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