Manitowoc 16000 User Manual

Reference Only
INTRODUCTION 16000 SERVICE/MAINTENANCE MANUAL
1-30
Published 05-03-17, Control # 228-03
The pump EDC continues to tilt the swashplate in the up
direction as the hydraulic fluid flows from the pump ports to
the motor ports. Return fluid is from the motor outlet ports to
the pump inlet port.
The Node-3 controller output voltage to the pump EDC and
the Node-4 and 5 controllers output voltage to each motor
PCP is relative to the control handle movement. As the
control handle is moved back, the pump swashplate angle is
increased. When the system pressure exceeds the PCOR
(Pressure Compensating Over-Ride) valve setting of 340 bar
(4,931 psi) the valve shifts to direct the flow from the shuttle
valve into the maximum displacement side of the servo
cylinder. The PCOR valve over-rides the command from the
servo PC valve, increasing the motor displacement and the
output torque and reducing the output speed. When the
PCOR valve closes, the control of the motor returns to the
servo PC valve.
The Node controllers are continuously balancing the system
pressure and the motor displacement angle so the motor
displacement goes to the minimum when the control handle
is fully back, if the motor torque requirement is not too high.
Node-4 and 5 controllers monitor the motor displacement
and controls the motor speed by regulating the hydraulic fluid
flow through the pumps.
When the control handle is moved to the neutral position, the
Node-1 controller compensates for hydraulic system leakage
or changing engine speed. The Node-3 controller sends a
zero output voltage to the hoist pump EDC that moves the
swashplate to the center position. This shifts the motor back
to the maximum displacement for slower output speed to
slow the drum rotation.
When the control handle is moved to the neutral position, the
Node-1 controller stores the load holding pressure in the
pressure memory. After the control handle center switch
opens, the Node-4 controller sends a zero output voltage to
disable the brake release solenoid HS-10. The drum brake
solenoid valve shifts to block pilot pressure to the brakes and
opens a line to the tank. Brakes apply before the drum pump
de-strokes.
Lowering Boom
See Figure 1-18 and Figure 1-19.
When the boom/mast hoist control handle is moved forward
for booming down, an input voltage of 2.6 volts or more is
sent to the Node-1 controller. The Node-3 controller sends a
variable 0 to 24 volt output that is divided by a resistor and
applied to the pump EDC.
The Node-4 and 5 controllers send a variable 0 to 24 volt
output that is divided by a resistor and applied to each hoist
motor PCP. The Node-1 controller checks that the boom up
limit switch is closed and no hydraulic system fault is
present.
The pump EDC tilts the swashplate in the up direction to
satisfy the pressure memory. The Node-1 controller
compares the drum holding pressure to the value in the
pressure memory. When system pressure is high enough,
the Node-4 controller sends a 24 volt output to the brake
release solenoid HS-10. The brake solenoid shifts to block
the drain port and opens the port to the low-pressure side of
system to release the boom/mast hoist drum brake.
When the brake is released, the pump EDC tilts the
swashplate to stroke the pump in the down direction. In the
down direction, the hydraulic fluid flow is from the pump port
to the motor port. Return fluid is from the motor outlet ports to
the pump inlet port.
The Node-3 controller output voltage to the pump EDC and
the Node-4 and 5 controllers output voltage to each motor
PCP is relative to the control handle movement. As the
control handle is pushed forward, the pump swashplate
angle is increased. When the system pressure exceeds the
PCOR (Pressure Compensating Over-Ride) valve setting of
340 bar (4,931 psi), the valve shifts to direct the flow from the
shuttle valve into the maximum displacement side of the
servo cylinder. The PCOR valve over-rides the command
from the servo PC valve, increasing the motor displacement
and the output torque while reducing the output speed.
When the PCOR valve closes, control of the motor returns to
the servo PC valve.
The node controllers continuously balance the system
pressure and the motor displacement angle so the motor
displacement goes to the minimum when the control handle
is fully forward, if the motor torque requirement is not too
high. The Node-1 controller monitors the motor displacement
and controls the motor speed by regulating the hydraulic fluid
flow through the pump.
The weight of the boom attempts to drive the motor faster
than the return fluid can return to the low-pressure side of the
pump. The system charge pump maintains the fluid supply at
a positive pressure to the motor. The pump swashplate
FIGURE 1-18
HS-10
HS-12
HS-11
HS-13
HS-14
Brake
Diverting
Valve
Pawl
Pump
(EDC)
16-1013
Accessory Pump
(Low-Pressure)
Accessory Pump
(Low-Pressure)
Motor
(PCP)
Pressure
Sender

Manitowoc 16000 Specifications

General

Brand	Manitowoc
Model	16000
Category	Construction Equipment
Language	English