
Reference
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INTRODUCTION
18000 SERIVCE/MAINTENANCE MANUAL
1-46
Published 12-05-17, Control # 035-23
WHIP LINE HOIST (DRUM 3) SYSTEM
Whip Line Hoist System Components
See Figures
The whip line hoist (Drum 3) is located on the rotating bed.
Main hoist 1 and whip line hoist is a dedicated system where
only one function can be operated at a time. In Standard
mode main hoist 1/3 pump drives the whip line motor through
a diverting valve that is controlled with control handle
movement and node controllers. The motor drives a drum
shaft that is connected to a gearbox.
The far right drum control handle on the right side console
operates the whip line hoist in Standard and Tandem Drum
mode. The first drum control handle on the right side console
operates the whip line hoist in Setup and Luffing Jib mode.
The whip line hoist control handle is inoperable when whip
line hoist park brake is applied.
Hydraulic pilot pressure to operate motor servo is from left
travel charge pump. A pressure sender in high-pressure side
of system provides system pressure information to node-1
controller. A fixed orifice between pump ports A and B allows
for smoother drum operation.
When whip line hoist drum motor rotates, a speed sensor at
motor rotor monitors and sends an input voltage to node-1
controller. Node-2 controller sends an output voltage to
rotation indicator in control handle. As load drum rotates
faster, the rotation indicator on top of control handle pulsates
with a varying frequency that indicates drum rotational
speed.
Continuous changing of fluid occurs through leakage in
pump, motor, and external sequence/flow valve. Sequence/
flow valve opens at 200 psi (14 bar) and removes 4 gallons
per minute (15 l/m) of hot fluid from system by dumping the
fluid into the motor case where fluid returns to tank.
Whip Line Drum Brake
Hydraulic pressure to operate whip line drum brake is from
low-pressure side of system.
When whip line hoist brake switch is in on - park position,
brake solenoid valve HS-8 is disabled so brake is applied to
drum. Drum pump does not stroke in response to control
handle movement.
When whip line hoist brake switch is placed in off - park
position, brake solenoid valve HS-8 remains disabled. Brake
remains applied until node-3 controller sends a 24 volt output
to release the brake. Whip line hoist circuit is active, waiting
for a control handle command.
Whip Line Hoist Raising
The following drum raising operation is for whip line hoist
while operating in Standard mode.
When whip line hoist control handle is moved back for
raising
, an input voltage of 2.6 volts or more is sent to node-
1 controller. Node-4 controller sends a 24 volt output to drum
3 diverting solenoid valve HS-9 to shift valve and open lines
to drum 3 motor and close lines to main hoist 1 left side drum
motor. Node-3 controller sends a variable zero to 24 volt
output that is divided by a resistor and applied to main hoist
1/3 pump EDC in the hoist direction. Node-3 controller sends
a variable zero to 24 volt output that is divided by a resistor
and applied to whip line motor PCP. Node-1 controller
checks that drum block-up limit switches are closed and no
system faults are present.
Main hoist 1/3 pump EDC tilts swashplate in the
up
direction
to satisfy pressure memory. Node-1 controller compares
drum holding pressure to value in pressure memory. When
system pressure is high enough, node-3 controller sends a
24 volt output to enable drum brake solenoid valve HS-8.
The drum brake solenoid shifts to block drain port and opens
port to low-pressure side of drum system to release brake.
The pump EDC continues to tilt swashplate in the up
direction as hydraulic fluid flow is from port B of pump to port
A of motor. Return fluid is from port B of motor to return port
A of pump.
Node controller output voltage to pump EDC and motor PCP
is relative to control handle movement. The system pump
varies flow to keep drum at handle command setting. As
control handle is moved back, an output voltage increases
the pump swashplate angle. When system pressure
exceeds the PCOR (Pressure Compensating Over-Ride)
valve setting of 4,930 psi (340 bar), the valve shifts to direct
flow from shuttle valve into maximum displacement side of
servo cylinder. The PCOR valve over-rides the command
from servo PC valve, increasing motor displacement and
output torque and reducing output speed. When PCOR valve
closes, control of the motor returns to servo PC valve.
Node controllers are continuously balancing the system
pressures and the motor displacement angle so the motor
displacement goes to minimum when control handle is all the
way back, if the motor torque requirement is not too high.
Node-1 controller monitors motor displacement and controls
motor speed by regulating the hydraulic fluid flow through the
pump.
Содержание 18000
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