Version with electric motor, Electric system, Electric motor – Liebherr R 944 C Litronic High Rise User Manual

Page 3: Hydraulic system, Hydraulic controls, Swing drive, Operator’s cab, Undercarriage, Attachment

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R 944 C Litronic High Rise

3

Version with Electric Motor

Electric System

The 400 V electrical cabinet provides a degree of protection to IP55.

This houses the following components:

– Main motorised isolator, controlled from the cab

– Star/delta starter for motor

– Outlets for supplying auxiliary elements: heating, climate control

– Various heat protection devices

– Resistors for controlling the temperature of the cabinet

– Booster pump integrated in the cabinet: Cabinet air filtered (option)

– Transformers – rectifier for 24 V control circuit

– Motor protection attachment

– Auxiliary batteries: 2 x 135 Ah/12 V: secured functions: lighting for excavator/

attachment position (option)

Electric Motor

Motor

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asynchronous three-phase, cage rotor enclosed

in cast iron envelope, special Liebherr design

Power rating

(as per CEI 34-1)

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200 kW (272 HP) at 1,485 RPM

Rated voltage

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400 V – 50 Hz *

Number of poles

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4

Design type

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horizontal axle B35

axle height 315 mm

painting: RAL 7031

Standard degree of protection

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IP55 – steel flange FF600

Insulation

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class F, thermal loading: Class B,

ambient temperature 40 °C

Starter star/delta

Heat protection for windings

Heat protection for bearings

Anti-condensation heating system resistors

Hydraulic System

Hydraulic pump

for attachment and

travel drive

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two Liebherr variable flow, swash plate pumps

Max. flow

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2 x 305 l/min.

Max. pressure

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350 bar

Pump regulation

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electro-hydraulic with electronic engine speed

sensing regulation, pressure compensation, auto-

matic oil flow optimizer

Hydraulic pump

for swing drive

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reversible, variable flow, swash plate pump,

closed-loop circuit

Max. flow

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205 l/min.

Max. pressure

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370 bar

Hydraulic tank

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460 l

Hydraulic system

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710 l

Hydraulic oil filter

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2 full flow filters in return line with inte grated fine

filter area (5 µm)

Hydraulic oil cooler

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radiator equipped with hydrostatic drive fan for

cooling the hydraulic oil and climate control

condenser

Liebherr Tool Control

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ten preadjustable pump flows and pressures for

add on tools (option)

Hydraulic Controls

Power distribution

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via monoblock control valve with integrated

safety valves

Flow summation

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to boom and stick

Closed-loop circuit

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for uppercarriage swing drive

Servo circuit

Attachment and swing

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proportional via joystick levers

Travel

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– proportional via foot pedals or removable hand

levers

– speed pre-selection

Additional functions

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via foot pedals or joystick toggle switch

Swing Drive

Drive by

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Liebherr hydraulic motor with integrated brake

valves

Transmission

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Liebherr compact planetary reduction gear

Swing ring

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Liebherr, sealed single race ball bearing swing

ring, internal teeth

Swing speed

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0 – 7.9 RPM stepless

Swing torque

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119 kNm

Holding brake

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wet multi-disc (spring applied, pressure released)

Option

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pedal controlled positioning brake

Operator’s Cab

Cab

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built from deep drawn components, resil iently

mounted, sound insulated, tinted windows, front

window stores overhead, door with sliding

window

Operator’s seat

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shock absorbing suspension, adjustable to

operator’s weight, 6-way adjustable seat

Joysticks

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integrated into adjustable seat consoles

Monitoring

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menu driven digital display of current operating

conditions. Automatic monitoring, display,

warning (audible and visual signal) and saving

of machine malfunction data, such as overheating

of windings, motor bearings, or low hydraulic oil

level

Heating system

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standard air conditioning, combined cooler/

heater, additional dust filter in fresh air/recircu-

lated

Undercarriage

Version HR

Drive

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Liebherr hydraulic motor with integrated brake

valves on both sides

Transmission

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Liebherr planetary reduction gears

Travel speed

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low range – 3.0 km/h

high range – 3.8 km/h

Drawbar pull max.

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320 kN

Track components

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D 7 G, maintenance-free

Track rollers/Carrier rollers

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13/3

Tracks

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sealed and greased

Track pads

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flat pad

Digging locks

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wet multi-discs (spring applied, pressure

released)

Brake valves

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integrated into travel motor

Attachment

Type

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high-strength steel plates at highly-stressed

points for the toughest requirements. Complex

and stable mountings of attachment and cylin-

ders. Unrivalled strength, even at high loads

Hydraulic cylinders

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Liebherr cylinders with special seal system.

Shock absorption

Pivots

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sealed, low maintenance

Lubrication

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Liebherr semi-automatic central lubrication

system

VarioLiftPlus

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variable boom mounting positions for optimized

lift capacities

* Other voltages and frequencies possible on request.

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