Technical data, Resilient suspension, Attachment – Liebherr EP 944 C Stationary Material Handler User Manual

Page 12: Electric motor, Electric system, Hydraulic system, Hydraulic controls, Swing drive, Operator’s cab, Ep 9 3 4 c

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EP 934 C EP 944 C EP 954 C Machine for Industrial Applications

Technical Data

Resilient Suspension

The resilient suspension consists of 12 resilient contact blocks. Its main function

is to absorb the shocks and vibrations resulting from the movement of the exca-

vator.

An electrical rotating joint is integrated into the resilient suspension and allows

the electrical supply to the excavator to be assured. This meets the sealing

requirements of IP55.

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

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variable boom mounting positions for optimized

lift capacities

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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160 kW (217 HP) at 1,489 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

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)

Hydraulic System

Hydraulic pumps

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.

Max. pressure

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350 bar

Pump regulation

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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 com-

ponents 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.

Max. pressure

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370 bar

Hydraulic tank

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340 l

Hydraulic system

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550 l

Filtration

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filter in the return circuit, with integrated 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

Liebherr 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 inte-

grated 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 opera-

tion

Travel

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– proportional by pedals or by lever

– speed pre-selection

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

Swing speed

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0 – 9.4 RPM, stepless

Swing torque

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81.07 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

EP

9

3

4

C

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