Generac Power Systems GP Series Diagnostic And Repair Manual

Diagnostic Repair Manual 7
Section 2 Engine DC Control System
Printed Circuit Board
General Theory
The printed circuit board is responsible for cranking,
startup, running and shutdown operations. It
interconnects with other components of the DC control
system to cycle them on and off at the proper times. It is
powered by fused 12 VDC power from the unit battery.
Circuit Board Connections
See Figure 2-1. The circuit board mounts 12-pin
receptacle J2 and 5-pin receptacle J1. Table 2-1 shows
12-pin receptacle J2, the associated wires and the
function of each pin and wire.
Dip Switch Positions
NOTE: See Figure 2-1. These switches must remain in
the factory settings.
1. Stepper Motor Rotation
a. Switch set to ON for clockwise rotation
(Factory Position).
b. Switch set to OFF for counterclockwise
rotation.
2. Frequency Setting
a. Switch set to OFF for 60 Hertz (Factory
Position).
b. Switch set to ON for 50 Hertz.
Figure 2-1. Printed Circuit Board
NOTE: J1 connector is utilized for governor control.
Battery
Recommended Battery
When anticipated ambient temperatures will be
consistently above 32 °F. (0 °C.), use a 12 VDC Group
U1 storage battery capable of delivering at least 360
CCA (cold cranking amperes).
A. Dip Switches
B. Sensing LED
C. J2 Connector
D. J1 Connector
C
D
B
A
004571
Table 2-1. Receptacle J2 Functions
Terminal Wire Function
115B
12 VDC input when the start stop relay
(SSR) is energized.
283
Ground input when the idle control switch
(SW2) is placed in the CLOSED position
3TR1
AC voltage input from the idle control
transformers.
4 0 Common ground for the PCB
5167
12 VDC input when SW1 is placed in
the START position. Ground input
when SW1 is placed in the STOP
position.
6TR2
AC voltage input from the idle control
transformers.
786
Fault shutdown circuit. When grounded
by closure of the low oil pressure
switch (LOP) engine will shut down.
8229
Switched to ground for start stop relay
(SSR) operation.
9 NOT USED
10 44S
AC input for frequency control. 11S/
44S 240VAC (Older Style)
22S
AC input for frequency control. 11S/
22S 240 VAC (Newer Style)
11 NOT USED
12 11S
AC input for frequency control. 11S/
44S 240 VAC or 11S/22S 240 VAC

Generac Power Systems GP Series Specifications

General

Brand	Generac Power Systems
Model	GP Series
Category	Portable Generator
Language	English