Liebherr’s LPS 420 E purely electric driven crane in its mobile harbour crane product range is capable of handling containers to bulk, general cargo and heavy lift cargoes weighing up to 124 tonnes.
The LPS 420 E is especially optimised for terminals with a power supply ranging from 380 V to 460 V. Thanks to the Liebherr active-front-end frequency converter deviations in the voltage, supply can be compensated easily for safe and stable operation.
Due to the critical conditions, like limited space and harsh environmental conditions, a liquid-cooled and highly efficient multi-drive frequency converter system was implemented. The frequency converters are Liebherr-built components, which have already proven themselves in Liebherr ship-to-shore gantry cranes and material handlers.
As an additional benefit, high power energy storage units can be used to reduce the peak-load in the crane main power supply and take advantage of regenerative energy within the system. The compact unit ensures a high power storage capacity, which enables the accumulation and supply of 200 kW of power within 15 seconds.
With a turnover of up to 1,200 tonnes per hour, the Liebherr electric crane exceeds the average turnover of comparable electric driven cranes in the market. With a maximum outreach of up to 48 m, ships with a size of up to Panamax class can be served. This makes the crane the ideal electrical driven solution for bulk handling.
The main components of the E-drive are liquid cooled and the heat is dissipated by heat exchangers. The fully closed liquid cooling system in combination with the heat exchanger are installed on top of the slewing platform, which means that no overpressure unit is necessary to prevent dust coming inside the machinery house. This is a big benefit for cranes working in a dusty environment.
The LPS 420 E is also an ideal solution for container handling terminals, with up to 30 cycles per hour. The crane can be fitted with various types of fixed or telescopic spreaders.
The operator of the LPS 420 E can rely on very dynamic electric motors, while the low moment of inertia ensures a fast response of the motor for precise drive characteristics.
Due to the high motor speed spread no gear shifting between normal and heavy load is required. This allows for uninterruptible power transmission from maximum load to maximum speed. Moreover, said Liebherr, the noise emission of the planetary gear box is low.
See more about the LPS 420 E here.
