Jacobsen AR3, Technical/Repair Manual

Page: 97 / 342

4-40 4181384 First Edition
ELECTRICAL
4
Park Brake 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 park brake switch.
Park Brake Circuit—Brake Released
When the park brake switch is in the brake released
position, current flows to the park brake solenoid,
energizing the solenoid. With the solenoid energized, the
park brake is released.
Park Brake Circuit—Brake Locked
When the park brake switch is in the brake lock position,
current does not flow to the park brake solenoid,
de-energizing the solenoid. With the solenoid
de-energized, the park brake is locked.
With the park brake switch is in the brake lock position,
voltage is provided to the control module 5V park brake
switch input, activating the input. (See “Run Circuit—
Theory of Operation” on page 4-33.) and (See “Start
Circuit—Theory of Operation” on page 4-29.)