Textron JACOBSEN GP400, Technical/Repair Manual

Page: 80 / 354

4-28 4252490-Rev A
ELECTRICAL
4
Backlap Circuit—Theory of Operation
Power Circuit
When the key switch is turned to the run position, voltage
is provided from key switch terminal B to control module
terminals J1-2, J2-11, and J2-12, powering up the control
module. (See “Power Circuit—Theory of Operation” on
page 4-14.)
Interlock Circuit
When backlapping, the following must occur:
• Seat switch in the on position (operator on seat)
• Mow/transport lever in the mow position
• Park brake switch in the on position
• Cutting units in the lowered position
When the seat switch is in the on position, voltage is
provided to the control module seat switch input terminal
J1-7, activating the input.
When the mow/transport lever is in the mow position, the
mow/transport linkage is brought near the mow/transport
proximity switch, activating the switch. With the
mow/transport switch activated, voltage is provided to the
mow switch.
When the park brake switch is in the on position, voltage
is provided from the switch to the control module park
brake switch input terminal J1-11, activating the input.
When the cutting units are placed in the lowered position,
the control module allows activation of the mow circuit.
The control module records the last position of the cutting
units.
Backlap Circuit
When the reel valve is placed in the backlap position, the
backlap switch is moved to the on position. With the
switch in the on position, ground is provided from the
switch to control module backlap switch input terminal
J1-10, activating the input. With the input activated, the
control module allows operation of the cutting units with
the park brake engaged with the operator off the seat.
With the operator on the seat and when the mow switch
is in the on position, voltage is provided to the control
module mow switch input terminal J1-5, activating the
input. With the input activated, the control module mow
solenoid output terminal J2-9 provides voltage to the
mow solenoid, energizing the solenoid. With the solenoid
energized and the reel valve in the backlap position, the
cutting units operate in the reverse direction. The
operator can now leave the seat and the mow circuit
continues to operate.
If the operator is off the seat for a period greater than 5
minutes, the control module deactivates the mow
solenoid.