Liebherr’s new LR 1160.1 unplugged is a 160-tonne battery-operated crawler crane that features new Gradient Travel Aid technology. The electro-hydraulic drive has the same performance specifications as the conventional version and both versions are operated in the same way. The LR 1160.1 unplugged produces no emissions and runs at a low noise level, making it well suited for noise-sensitive areas.
Charging and noise-reduction
According to Liebherr, the sound pressure level of three unplugged cranes in idling mode, at a distance of 16 m, is equivalent to that of a normal conversation on the jobsite from a distance of one meter, which corresponds to a value of 60 dB(A).
The LR 1160.1 unplugged can be operated with or without cable and the capacity of the battery is designed for 8 hours of lifting operation.
Also, the crane can be operated without restrictions while plugged into a conventional electric supply with 63 A, or charged within 4.5 hours. Using a 125 A supply, the battery can be charged in only 2.5 hours.
A safety-centric design
According to Liebherr, the designers of the crane laid great emphasis on the safety of the LR 1160.1 unplugged and it is equipped with all established assistant systems for safe operation.
The latest feature of the LR 1160.1 unplugged is the Gradient Travel Aid for the safe negotiation of slopes and inclines. 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 information about the permissible and actual gradient and the crane’s overall centre of gravity at all times. If necessary, the boom angle can be altered so that the machine remains in the safe area.
Also, the Ground Pressure Visualization calculates the actual ground pressure of the machine in real time and compares it with the specified safety limits of the relevant jobsite. So, the operator is permanently aware of whether the machine is situated in, or is approaching, a critical area.
When erecting or lowering the boom, the Boom Up-and-Down Assistant indicates the approach to the tipping border and automatically stops operation before the operator unintentionally enters an unsafe zone.
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