Engine Startup And Running - Bryant ASPAS1BBA007 Diagnostic Repair Manual

SECTION 4.2
OPERATIONAL ANALYSIS

ENGINE STARTUP AND RUNNING

With the fuel solenoid open and ignition occurring, the
engine starts. Engine startup and running may be
briefly described as follows:
11
22
11
22
4
ELECTRONIC C2-10
VOLTAGE 4
REGULATOR 0
6
162
CB2
C2-8
DIAGRAM KEY
BA - BRUSH ASSEMBLY
BCR - BATTERY CHARGE RELAY
CB1 - CIRCUIT BREAKER, MAIN OUTPUT
CB2 - CIRCUIT BREAKER, ALT. EXCITATION
CB3 - CIRCUIT BREAKER, EXTERNAL OUTLET, PUSH/PULL
D - DIODE
FS - FUEL SOLENOID
F1 - FUSE 15 AMP
F2 - FUSE 7.5 AMP
HTO - HIGH OIL TEMPERATURE SWITCH
IM1 - IGNITION MODULE, CYLINDER #1
IM2 - IGNITION MODULE, CYLINDER #2
LOP - LOW OIL PRESSURE SWITCH
SC - STARTER CONTACTOR
SCR - STARTER CONTACTOR RELAY
SP1, SP2 - SPARK PLUGS
SW1 - AUTO / OFF / MANUAL SWITCH
SW2 - SET EXERCISE SWITCH
SM - STARTER MOTOR
TX - TRANSFORMER, 16 Vac 56 VA & 16 Vac 1 VA (DUAL SEC.)
= 12 VDC ALWAYS PRESENT
= AC VOLTAGE
= GROUND FOR CONTROL PURPOSES
Page 82
11
3
2
1
BATTERY 225B
CHARGER
13
2
1
0
13
C2-1
77
BATTERY CHARGE
WINDING
0
C2-4
C2-11 0
BA
0
FIELD
0
C2-9
0
C1-6
6
0
C2-7
2
DPE WINDING
(STATOR)
• An AC voltage/frequency signal is delivered to the
circuit board from the generator engine run winding,
via Wire 66A. When AC frequency reaches
approximately 30 Hz, the circuit board (a)
terminates cranking, and (b) turns on an "engine
warm-up timer".
22
225A
224A
224B
7 7 7 7 9 9 9 9
1 6 3 4
77
66
66
C2-2
0
0
HTO 0
55
ENGINE RUN
SW2
C1-4
WINDING
(STATOR)
C2-3
4
66A
85
351
1 2 3 4
J2
CONTROL
PRINTED CIRCUIT
BOARD
= DC FIELD CONTROL VOLTAGE
= 12 VDC DURING CRANKING ONLY
= 12 VDC DURING ENGINE RUN CONDITION
PART 4
DC CONTROL
13
BCR
13
0
14
0
LOP
14
C1-3
86
4
225
66A
5
23
1 4
J1
194
2
86
3 23
4
194
5
56
6
18
7
66A
9
239
15A
17
11
12 15
13 0
14 225
224
15
16
17
11
22
225A
224A
225
224
0 0
13
0 0
13
15A
23
194
14
224
239
66A
15A