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