Generac Power Systems 8 kW LP - Manual (Page 115)

CONTROLLER DISPLAY
Running - Utility Lost
CONTROLLER
= 12 VDC ALWAYS PRESENT
= AC VOLTAGE
= GROUND FOR CONTROL PURPOSES
= 12 VDC DURING CRANKING ONLY
= 12 VDC DURING ENGINE RUN CONDITION
= DC FIELD EXCITATION
= 5 VDC TO LED
0
4
4
0
BA
6
11
22
6
2
2
REGULATOR
11
2
6
0
4
22
VOLTAGE
4 0
0
13
13
18
SP2
IM2
16
13
SCR
0 0
86 85
HTO LOP
18
0
13
12V
BATTERY
SCR
SM
IM1
SP1
44
11
POWER
WINDING
33
22
WINDING
POWER
STATOR
4
0
56
0
SC
820
817
818
819
819
818
817
820
L2
L1
LED BOARD
4
3
2
1
4
ACTUATOR
GOVERNOR
14
14
90
OUTPUT
GENERATOR
240 VAC
NEUTRAL
INPUT
UTILITY
240 VAC
TRANSFER
+ BATTERY
GROUND
56 0 15B 23
23
0
0
FS
BATTERY WARMER
OPTIONAL
N1
00
22
33
11
44
CB
15B
14
0
0
CS
N2 N1
2 1
N2 N1
18
13
86
85
4
3
2
1
18 17 16 15 14 13 12 10 9 11 8 6 7 4 3 5
CB - CIRCUIT BREAKER, MAIN OUTPUT
HTO - HIGH TEMPERATURE SWITCH
FS - FUEL SOLENOID
LEGEND
SCR - STARTER CONTROL RELAY
SC - STARTER CONTACTOR
CS - CHOKE SOLENOID
LOP - LOW OIL PRESSURE SWITCH
SM - STARTER MOTOR
BA - BRUSH ASSEMBLY
IM_ - IGNITION MODULE
SP_ - SPARK PLUG
0
J3
J1
PRINTED CIRCUIT BOARD
TO
PCB
7.5 AMP FUSE
SELF RESETTING FUSE
J2
Page 113
sEctioN 4.2
oPEratioNal aNalYsis
Figure 5. circuit condition - initial transfer to Standby
• When the circuit board’s “engine warm-up timer” times out, circuit board action completes the Wire 23 circuit to
ground. The transfer relay then energizes and its normally open contacts close.
• Standby power is now delivered to the standby closing coil (C2), via Wires E1/E2, the normally open transfer
relay contacts, Wire 205, limit switch XB1, Wire B, and a bridge rectifier. The standby closing coil energizes and
the main current carrying contacts of the transfer switch are actuated to their STANDBY source side.
• As the main contacts move to their STANDBY source side, a mechanical interlock actuates limit switch XB1 to
its open position and limit switch XA1 to its “Utility” side position. When XB1 opens, standby closing coil C2 3
de-energizes.
• Standby power is delivered to the LOAD terminals (T1/T2) of the transfer switch.
DC CONTROL Part 4