Initial Dropout Of Utility Source Voltage - Generac Power Systems 7 kW NG Repair Manual

Section 4.3
Operational Analysis
Refer to Figure 96. Should a Utility power failure occur, circuit condition may be briefly described as follows:
• The controller continually monitors for acceptable Utility voltage via N1 and N2. Should Utility voltage drop below approximately
65% of the nominal source voltage, a programmable timer on the controller will turn on.
• In Figure 95, the 10-second timer is still timing and engine cranking has not yet begun.
• The AUTO-OFF-MANUAL switch is shown in the AUTO position. Battery voltage is available to the circuit board via Wire 13, the
7.5 amp fuse (F1). Wire 194 provides 12VDC to the transfer relay in the transfer switch.
OPTIONAL
BATTERY WARMER
240Vac
1
CONNECT
N1A
OPTIONAL
OIL WARMER
N1B 1
240Vac
CONNECT
N1
N1 00 2
T1 N2
1 2 3 4 5 6 7
J5
1 2 3 4 5 6 7
Page 98

INITIAL DROPOUT OF UTILITY SOURCE VOLTAGE

2
N2A
2 N2B
N2
00
6
4
T1A
0
11
N1
44
N2
T1
44 0 6
11 4
8 9 10 11 12 13 14
Utility Dropout
Pausing 10 seconds
CONTROLLER
PRINTED CIRCUIT BOARD
J4
8 9 10 11 12 13 14 15 16 17 18
MOV
19 20 21 22 23
Figure 95.
PART 4
ENGINE/DC CONTROL
NEUTRAL
00 WHT
N1
240 VAC
UTILITY
N2 INPUT
120 VAC
T1
LOAD SUPPLY
BATTERY CHARGER