4-34 4181383 First Edition
ELECTRICAL
4
Mow Circuit—Theory of Operation
Power Circuit
Unswitched power is available from the battery positive
terminal to the starting motor battery terminal and then
from the starting motor battery terminal to 50 amp
thermal circuit breaker battery terminal. Unswitched
power is available from 50 amp thermal circuit breaker
battery terminal to key switch terminal A and control
module terminal J3-6.
When the key switch is turned to the run position, voltage
is provided from key switch terminal B to control module
switch power input terminal J3-2, powering up the control
module and energizing the internal switched power relay.
Voltage is also provided from key switch terminal B to
control module select 2 input terminal J4-2, activating the
input. With the select 2 input activated, the control
module selects the software program for this machine.
This allows the control module to be used in more than
one machine.
With the internal switched power relay energized,
switched power is available from switched power relay
terminal 87 to control module terminal J3-5. Switched
power is available from control module terminal J3-5 to
splice 100. From splice 100, switched power is available
to the Hydraulic oil level switch.
Switched power is available from hydraulic oil level switch
to the seat switch and then from the seat switch to the
mow switch.
Interlock Circuit
Before the control module allows activation of the mow
circuit, the following must occur:
• Park brake must be in the released position.
• Control module seat switch input activated.
To activate the control module seat switch input, the
operator must be on the seat. With the operator is on the
seat, the seat switch contacts close. With the seat switch
contacts closed, voltage is provided from the switch to
control module seat switch input terminal J1-8, activating
the input.
Mow Circuit
When the mow switch is in the mow position, voltage is
provided to the control module mow switch input terminal
J1-10, activating the input. When the raise/lower switch is
momentarily placed in the lower position, voltage is
provided to control module lower input terminal J1-12,
activating the input. (See “Raise/Lower Circuit—Theory
of Operation” on page 4-30.)
With the mow switch input activated and lower switch
input momentarily activated, current flows from mow
solenoid output terminal J3-11 to the mow solenoid,
energizing the solenoid.
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