4-36 4181384 First Edition
ELECTRICAL
4
Raise/Lower Circuit—Theory of
Operation
Power Circuit
Unswitched power is available to key switch terminal 30.
When the key switch is turned to the run position, current
flows from the AC terminal of the key switch through
10-amp fuse F10 to control module terminals 3 and 8,
powering up the module. With the control module
powered up, the control module now provides 5 volts to
the raise/lower switch.
Raise Circuit
When the raise/lower switch is placed in raise position,
voltage is provided from the raise switch contacts to
control module 5V raise switch input terminal 14,
activating the input. With the input activated, current
flows from control module 12V raise solenoid output
terminal 9 to the raise solenoid, energizing the solenoid.
With the solenoid energized, the cutting units will
continue to rise until the raise/lower switch is released, or
until the cutting units reach their end of travel.
Lower Circuit
To energize the lower solenoid, the weight transfer switch
must be in the off position.
When the raise/lower switch is momentarily placed in
lower position, voltage is provided from the lower switch
contacts to control module 5V lower switch input terminal
15, momentarily activating the input. With the input
momentarily activated, current flows from control module
12V lower solenoid output terminal 13 through the weight
transfer switch to the lower solenoid, energizing the
solenoid. With the solenoid energized, the cutting units
are lowered.
The control module continues to energize the lower
solenoid until the raise/lower switch is placed in the raise
position.
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