Technical data, Attachment, Electric motor – Liebherr ER 944 C High Rise User Manual

Page 7: Electric system, Hydraulic system, Hydraulic controls, Swing drive, Operator’s cab, Undercarriage

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ER 934 C ER 944 C ER 954 C High Rise

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Technical Data

Attachment

Type

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high-strength steel for extreme stresses. Bearings

designed for optimum distribution of stresses

Hydraulic cylinders

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Liebherr cylinders with end-of-travel shock

absorbing, fitted with guide and sealing joints

Pivots

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sealed, low maintenance

Lubrication

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centralised semi-automatic Liebherr lubrication

system

VarioLift

Plus

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variable boom mounting positions for optimized

lift capacities

Electric Motor

Engine

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induction motor dedicated definition Liebherr

934

944

954

Power rating

(as per CEI 34-1)

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160 kW (218 HP) 200 kW (272 HP) 250 kW (340 HP)

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

Standard degree of protection

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IP55

Insulation

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class F

Cooling

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IC06

Heat protection for windings

Heat protection for bearings

Anti-condensation heating system resistors

Electric System

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

This houses the following components:

– Electrical cabinet – remote control inside the cab

– Star/delta starter for motor

– Outlets for supplying auxiliary elements: heating, climate control

– Overheat protection devices

– Integrated heating and ventilation

– Filtered booster

– Transformers – rectifier for 24 V control circuit

– Motor protection

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

attachment position (option)

– Connecting inside closed panel

– Equipment: slip ring collector

power connector

embedded cable reel

Hydraulic System

934

944

954

Hydraulic pump

for the attachment

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two Liebherr swash plate pumps with variable

output

Max. flow

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2 x 253 l/min.

2 x 305 l/min.

2 x 341 l/min.

Max. pressure

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350 bar

Pumpenansteuerung

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electro-hydraulic, with electronic regulation by

power limit, minimum pump flow at max. pres-

sure, distribution of oil to different receptor

components proportional to demand

Hydraulic pump

for the swing drive

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reversible swash plate pump, in closed circuit

Max. flow

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170 l/min.

205 l/min.

205 l/min.

Max. pressure

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370 bar

Hydraulic tank

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340 l

460 l

440 l

Hydraulic system

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550 l

710 l

790 l

Filtration

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934: filter in the return circuit, with integrated fine

filter elements (5 μm)

944/954: 2 filters in the return circuit, with inte-

grated fine filter elements (5 μm)

Cooling

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radiator equipped with hydrostatic drive fan for

cooling the hydraulic oil and climate control

condenser

Tool Control

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10 flow rates and pressures adjustable as option

for optional accessories

Hydraulic Controls

Power distribution

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with the aid of hydraulic distributors with

integrated safety valves

Flow summation

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to boom stick and stick

Closed-loop circuit

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for uppercarriage swing drive mechanism

Control

Attachment and swing

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proportional by handling element in cross

operation

Travel

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proportional by pedals or by lever

Additional functions

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proportional by pedals or by toggle switch

* Other voltages and frequencies possible on request.

Swing Drive

Drive by

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hydraulic swash plate 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

934

944

954

Swing speed

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0 – 9.4 RPM

0 – 7.9 RPM

0 – 5.6 RPM

stepless

stepless

stepless

Swing torque

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81.07 kNm

119 kNm

167.23 kNm

Holding brake

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oil-bath disk brake (negative action)

Option

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pedal controlled positioning brake

Operator’s Cab

Cab

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single shell concept with shaped profiles, resil-

iently mounted, sound insulated, tinted windows.

Front window can be folded away under roof,

door with sliding window

Operator’s seat

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shock absorbing suspension, adjustable to

operator’s weight, 6-way adjustable seat

Controls

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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, warn-

ing (audible and visual signal) and saving of

machine malfunction data, such as overheating

of windings, motor bearings, or low hydraulic

oil level

Climate control

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standard climate control system, combined

cooler/heater, additional dust filter in the outside/

fresh air circuit

Noise emission

2000/14/EC

934

944

954

L

WA

(surround noise)

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101 dB(A)

103 dB(A)

105 dB(A)

Undercarriage

Version HR

Drive

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Liebherr swash plate motors with integrated

brake valves on both sides

Transmission

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Liebherr planetary reduction gears

934

944

954

Travel speed

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2.6 km/h

2.6 km/h

2.5 km/h

Drawbar pull max.

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318 kN

363 kN

397 kN

Track components

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maintenance-

maintenance-

maintenance-

free

free

free

B 60

D 7 G

D 8 K

Track rollers/Carrier rollers

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9/2

13/3

13/3

Tracks

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sealed and greased

Track pads

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triple grouser

Digging locks

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wet multi-discs (spring applied, pressure

released)

Brake valves

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integrated into travel motor

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