Textron JACOBSEN GP400, Техническое руководство по ремонту

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4-26 4252490-Rev A
ELECTRICAL
4
Mow 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
Before the system allows activation of the mow circuit,
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 off 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 1 position (mow),
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 terminal 3 on the mow switch.
When the park brake switch is in the off position, voltage
is not provided from the switch to the control module park
brake switch input terminal J1-11, indicating the switch is
in the off position.
When the cutting units are placed in the lowered position,
the control module allows activation of the mow circuit.
Mow Circuit
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.
When the raise/lower switch is momentarily placed in the
raise position, after a delay of 1.5 seconds the control
module de-energizes the mow solenoid and energizes
the raise solenoid for approximately 2 seconds, raising
the cutting units.
When the raise/lower switch is momentarily placed in the
lower position, the control module will lower the cutting
units and energize the mow solenoid.
If the operator leaves the seat with the park brake
engaged, the control module stops operation of the
cutting units. When the operator returns to the seat, the
mow switch must be placed in the off position to reset the
control module. After resetting the control module, return
the switch to the on position to resume operations.