Section 4.3 - Operational Analysis; Introduction; Utility Source Voltage Available - Generac Power Systems 7 kW NG Repair Manual

Section 4.3
Operational Analysis
The "Operational Analysis" is intended to familiarize the service technician with the operation of the DC and AC control system. A
through understanding of how the system works is essential to sound and logical troubleshooting. The control system illustrations
on the following pages represent a 17kW unit.
Refer to Figure 94. The circuit condition with the AUTO-OFF-MANUAL switch set to the AUTO position and with Utility source power
available can be briefly described as follows:
• Utility source voltage is available to the transfer switch Terminal Lugs N1 and N2 and the CONTACTOR is in the "Utility" position.
• Utility voltage is available to the controller via Wire N1 and N2 (see to Figure 92).
• Battery voltage is available to the controller via Wire 13 when a Battery is installed (see Figure 93).
Page 96

INTRODUCTION

UTILITY SOURCE VOLTAGE AVAILABLE

OPTIONAL
BATTERY WARMER
240Vac
1 2
CONNECT
N1A N2A
OPTIONAL
OIL WARMER
N1B 1 240Vac 2 N2B
CONNECT
N1 N2
00
6
4
0
11
N1
44
N2
T1
N1 00 2 44 0 6
T1 N2 11 4
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Running - Utility Loss
J5
CONTROLLER
PRINTED CIRCUIT BOARD
J4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
1 2
1 2
0 13
13 13
BATTERY
SCR
0 16
SC
SM
NEUTRAL
00 WHT
T1A
MOV
N1
N2
T1
18 19 20 21 22 23
Figure 92.
3 4 5 6 7 8 9 10 11 12 13 14
J5
CONTROLLER
PRINTED CIRCUIT BOARD
F1
J3
J4
3 4 5 6 7 8 9 10 11 12 13 14 15 16
13
Figure 93.
PART 4
ENGINE/DC CONTROL
240 VAC
UTILITY
INPUT
120 VAC
LOAD SUPPLY
BATTERY CHARGER
Ready to Run
17 18 19 20 21 22 23