Liebherr’s new LR 1300.2 SX unplugged crawler crane is powered by a 438 kW electric motor and, depending on the application, can be operated for up to 13 hours without a mains connection (i.e. unplugged), thanks to a 392 kWh battery. Subject to the available infrastructure on the jobsite, the complete battery-charging process lasts between 4.5 and 8.5 hours.
Whether attached to the electric supply or not, the performance and range of applications remains unchanged. This 300-t crawler crane delivers zero emissions, does not produce any exhaust fumes and is extremely quiet, making it ideal for noise-sensitive environments or urban areas.
For heavy lifting applications and long boom combinations, the lifting capacities of the LR 1300.2 SX unplugged can be improved and the range of applications extended by using the derrick equipment. Fine adjustment of the suspended counterweight is possible without an auxiliary crane.
The new crawler crane can be equipped with seven different boom configurations up to a maximum boom length of 169 m. The Crane Planner 2.0 lift planning software can be used to determine and simulate the perfect boom combination for the respective construction site requirements in advance.
Liebherr has also developed its own operating mode for lifting operations on floating units. This operating mode contains load curves for different inclinations (0°, 1°, 2°, 3°) with corresponding protection via the load moment limitation. The inclination of the floating unit is monitored during the entire operation and displayed to the crane driver. If the permissible limit value is exceeded, a warning is issued. The load curves are adjusted according to the respective inclination. Additionally, it prevents the maximum boom angle from being exceeded when the load is set down.
New safety concept
The assistance system vertical line finder is part of the new safety concept. It enables the crane driver to avoid diagonal pull at the touch of a button – especially those caused by changes in the inclination of the floating unit as a result of the shift in the centre of gravity when lifting and setting down the load.
One highlight is the gradient travel aid for the safe negotiation of slopes. The crane’s control system automatically calculates the centre of gravity and warns the operator before the crane leaves the safe area. While travelling, the operator receives real-time information about the permissible and actual gradient, and the crane’s overall centre of gravity at all times. If necessary, the main boom angle can be altered so that the machine remains in the safe area.
The crane’s ground pressure display shows the calculated ground pressure in real time. This means the operator is continuously aware of whether the machine is situated in, or is approaching, a critical area. The ground pressure of the LR 1300.2 SX unplugged can be reduced by up to 56% using the additional ground pressure reduction plates that are mounted at the front and rear of the crane. During lifting work, the operator can lower these plates to significantly increase the crane’s ground contact area.
The boom up-and-down assistant is also part of the safety concept. When erecting or lowering the boom, this assistance system indicates the approach to the tipping border and automatically stops operation before the operator unintentionally enters an unsafe zone. The operator no longer has to move the winches of the main boom and jib separately. Controlled folding of the jib begins at the press of a button. The speed of the laying down procedure is controlled with a single joystick. The boom-up-and-down assistant chooses the safest method for laying down the boom.
