Liebherr frequency converter
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 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 to 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.