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DESCRIPTION OF VALVE SECTIONS (CONTINUED)
C. HOSE REEL
The middle section of the manifold controls the hose reel. The flow rate is factory-set so that the
hose reel winds, and unwinds at a rate of about 12 RPM.
SUBSYSTEM 3: HYDRAULIC CONTROL SYSTEM
The hydraulic control system is an electrical system that controls all the hydraulic functions on
the Bark Blower. This 12-VDC system runs off the engine electrical system. It is a programmable
logic control (PLC) system located in the main control panel on the passenger-rear side of the
machine. This module controls the solenoid valves in the hydraulic system. The solenoids are
energized by way of the Deutsch connectors mounted on each solenoid.
When the MATERIAL START button on the hardwired material start / stop
pendant is activated, the proportional solenoid on the airlock valve section
is energized, which starts the airlock. The floor and feed roll solenoid is
energized automatically after a factory-set 2 second delay. This delay
ensures that the airlock has a chance to clear itself. After the delay, the floor
and feed roll will begin to move at the speed relative to the Floor speed.
This speed can be set by using the floor increase (FLOOR INC) and floor
decrease (FLOOR DEC) buttons on the keypad or the toggle switch on the
radio remote transmitter. The key pad also has a FLOOR ON / OFF button
that allows the operator to temporarily turn off the floor to clear out the
airlock.
As material drops into the top of the airlock, the pressure required to cut the
material is monitored by the pressure switch. This switch is located on the
forward port of the airlock valve section, in the manifold labeled PS-2 (see
the Valve Block illustration). The switch is normally open. When the airlock
motor stalls due to the rotor encountering an object it cannot cut, high pressure is created in the
airlock circuit and the pressure switch closes. The amount of time the pressure switch is closed is
monitored by a setting in the PLC box. If the switch remains closed for more than 0.5 second, the
system automatically reverses the rotor by energizing the reverse solenoid. It also de-energizes
the floor solenoid, thus shutting off the floor and the feed roll. The airlock will remain in reverse
for approximately 3 seconds. The system will then restart the floor and feed roll, in the material
feed direction, after allowing the airlock to clear itself.
When the MATERIAL STOP button is pushed, power is shut off to the solenoids controlling the
hydraulic motors on the floor, feed roll and airlock. Please note that the hydraulics will also stop if
the rear door on the feed roll housing is opened and cannot be restarted until the door closed and
the MATERIAL START button is pushed.
NOTE: The hydraulic system on this machine can also be stopped by
pressing the Emergency Stop (E-Stop) button either on the
main control panel or the radio remote. This method should
only be used in case of emergency.
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