Bryant ASPAS1BBA015 - Manual (Page 80)

Page 80
SECTION 4.2
OPERATIONAL ANALYSIS
PART 4
DC CONTROL
UTILITY VOLTAGE DROPOUT / ENGINE
CRANKING
• After fifteen (15) seconds and when the circuit
board's 15-second timer has timed out, if "Utility"
voltage is still below 60 percent of nominal, circuit
board action will energize the circuit board's crank
and run relays (K1 and K2) simultaneously.
• The crank relay (K1) will remain energized for about
15 seconds on the first crank cycle. The relay will
then de-energize for 7 seconds and will again
energize. This time it will remain energized for 7
seconds. Thus, the engine will crank cyclically for 7
second crank-rest cycles. This cyclic cranking will
continue until either the engine starts or until about
ninety (90) seconds of crank-rest cycles have
elapsed.
• When the crank relay (K1) is energized, circuit board
action delivers 12 volts DC to a starter contactor
relay (SCR), via Wire 56. When the SCR energizes,
its contacts close and battery power is delivered to a
starter contactor (SC). When the SC energizes, its
contacts close and battery power is delivered to the
starter motor (SM).The engine cranks.
CHARGER
BATTERY
0
162
22
VOLTAGE
REGULATOR
ELECTRONIC
6
4
0
11
(STATOR)
DPE WINDING
C2-8
2
C2-7
C2-11
C2-10
CB2
4
0
22
6
BA
FIELD
0
13
11 0
77 C2-1
3
1
2
C1-3
14
11
16
17
12
13
15
14
C2-3
PRINTED CIRCUIT
0
C1-6
C2-9
0
0
55
C2-4
4
0
WINDING
ENGINE RUN
(STATOR)
66
CONTROL
BOARD
3 2 1
J2
3
7
9
4
6
5
J1
5 4
1
2
66A
66A
85
351
HTO
C1-4
C2-2
0
0
SW2
17
225
15
224
0
66A
14
194
23
194
56
15A
66A
239
18
86
23
224
4
86
0
LOP
14
225
239
15A
23
194
13
225B
BATTERY CHARGE
WINDING
13
1
2
77
224B
11
22
1 6
66
3 4
225A
224A
9 7 7 9
BCR
0
14
13
13
13
0 0
224
225A
225
224A
22
11
0 0
15A
TX - TRANSFORMER, 16 Vac 56 VA & 16 Vac 1 VA (DUAL SEC.)
DIAGRAM KEY
BA - BRUSH ASSEMBLY
SCR - STARTER CONTACTOR RELAY
SC - STARTER CONTACTOR
HTO - HIGH OIL TEMPERATURE SWITCH
FS - FUEL SOLENOID
CB1 - CIRCUIT BREAKER, MAIN OUTPUT
LOP - LOW OIL PRESSURE SWITCH
IM2 - IGNITION MODULE, CYLINDER #2
IM1 - IGNITION MODULE, CYLINDER #1
SW1 - AUTO / OFF / MANUAL SWITCH
SM - STARTER MOTOR
SW2 - SET EXERCISE SWITCH
SP1, SP2 - SPARK PLUGS
CB2 - CIRCUIT BREAKER, ALT. EXCITATION
BCR - BATTERY CHARGE RELAY
F2 - FUSE 7.5 AMP
D - DIODE
F1 - FUSE 15 AMP
CB3 - CIRCUIT BREAKER, EXTERNAL OUTLET, PUSH/PULL
= 12 VDC ALWAYS PRESENT
= AC VOLTAGE
= GROUND FOR CONTROL PURPOSES
= 12 VDC DURING CRANKING ONLY
= DC FIELD CONTROL VOLTAGE
= 12 VDC DURING ENGINE RUN CONDITION