Initial transfer to the “standby” source, Part 4, Operational analysis – Generac Power Systems 8 kW LP User Manual

Page 114: Page 112

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background image

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 112

initial tranSFer to the “StandBy” Source

The generator is running, the circuit board’s “engine warm-up timer” is timing, and generator AC output is avail-
able to transfer switch terminal lugs E1 and E2 and to the open contacts on the transfer relay. Initial transfer to
the STANDBY power supply may be briefly described as follows:

• 12 volts DC output is delivered to the transfer relay (TR) actuating coil, via Wire 15B, and terminal A of the

transfer relay (TR) in the transfer switch. This 12 volts DC circuit is completed back to the board, via transfer
relay terminal B and Wire 23. However, circuit board action holds the Wire 23 circuit open to ground and the
transfer relay (TR) is de-energized.

Part 4

DC CONTROL

sEctioN 4.2

oPEratioNal aNalYsis

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