In recent decades, Liebherr has demonstrated the quality and reliability of its electric technology with the success of its dedicated product ranges for mining, dredging, and materials handling applications.
The electric system in the new Liebherr R 976-E 400 kW crawler excavator is supplied with 6000 V power via a cable connection, with the cable inlet in the center of the undercarriage, or on the sides if requested. A motor cable drum is also available as an option. The machine is powered by a high voltage 6000 V/50 Hz current collector. A switch cabinet transformer (high voltage/low voltage) and a low voltage cabinet for power distribution and control of 690 V, 230 V, and 24 V networks are located on the upper carriage.
The technology used in the R 976-E and R 980 SME-E offers a lot of advantages. Thanks to its constant speed whatever the load, an excavator with an electric engine has a longer service life. Also, the high availability of transient power for complex machine movements enables very high productivity. The R 976-E’s low-voltage electric squirrel-cage engine drives the hydraulic system. The engine features heat shielding on bearings and motor windings. Integrated into a frame with a reinforced flange, it enables safe, soft starting. The two robust electrical cabinets are assembled by welding into a structure specifically designed to withstand extreme working conditions. The lockable watertight (IP 65) doors are fitted with safety switches and an emergency stop. The high voltage cabinet is a dedicated contact for power connection and voltage transformer, while the low voltage cabinet is used for power connection monitoring.
Robustness, reliability, and cost-effectiveness
Liebherr excavators stand out on the market for their high performance. They are the end-product of robust design based on experience gained in mining applications. Their reliability has been tested in extreme conditions. In line with its commitment to ecology and sustainability, Liebherr guarantees zero pollutant gas emissions. In addition, to ensure quality, the electric power system was designed and produced entirely by Liebherr-France SAS itself.
Reduced maintenance and lower operating costs make an electric excavator more cost-effective than a diesel-engine machine. For greater comfort, the R 976-E and R 980 SME-E are extremely quiet. The robustness, reliability, and cost-effectiveness of the R 976-E and R 980 SME-E make them products of choice for environmentally friendly extraction applications.
A working environment up to the highest standards
The R 976-E and R 980 SME-E offer users comfort and safety. They feature a spacious cab equipped with an automatic permanent air-conditioning and heating system while the exterior has a 270° camera system plus an armored windscreen and roof window. The operator’s platform features a large number of additional monitoring functions and a standard large 9” screen.
Source: Liebherr