Generac Power Systems 16 kW NG User Manual
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
= 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
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
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.
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.
de-energizes.
• Standby power is delivered to the LOAD terminals (T1/T2) of the transfer switch.
DC CONTROL
Part 4