4-36 4181383 First Edition
ELECTRICAL
4
Traction Control Circuit—Theory of
Operation
Power Circuit
Unswitched power is available 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.
With the internal switched power relay energized,
switched power is available from switched power relay
terminal 87 to control module terminal J3-3. Switched
power is available from control module terminal J3-3 to
splice 90. From splice 90, switched power is available to
the traction control switch.
Traction Control Circuit
The machine must be mowing for the traction control
circuit to operate. (See “Mow Circuit—Theory of
Operation” on page 4-34.)
When the traction control switch is momentarily placed in
the on position, voltage is momentarily provided to the
control module traction control switch input terminal J1-9,
momentarily activating the input. With the input
momentarily activated, control module raise solenoid
output terminal J2-3 provides voltage to the raise
solenoid, energizing the solenoid. At the same time
control module lower solenoid output terminal J2-4
provides a pulsing voltage to the lower solenoid.
With a pulsing voltage applied to the lower solenoid and
raise solenoid energized, the cutting units are slightly
raised, shifting the weight of the mower decks back to the
tires.
Control module traction control light output terminal
J2-10 also provides voltage to the traction control switch
light, turning on the light.
Note: The height the cutting units are raise to can be
calibrated. Calibration is required after hydraulic
components are replaced or when the control module is
replaced.
To Next Page
Loading...
Need help?
General
