Safety instructions
Operating Manual
Safety information for electrical system
Danger! High voltage is still present on the excavator up to the main breaker 6kV when the machine is in standby by pushing button 6kV OFF from the cab. ALL ELECTRIC WIRES AND BOXES mounted on upper/undercarriage must be considered under voltage. To disconnect totally the excavator, proceed with a lock and tag out procedure at the power station as follows: Locate power station supply and distribution. Stop excavator, disconnect excavator from the network at field switch. Check voltage presence on excavator supply line. Earth and short-cut the supply line. Lockout and tag out at field switch.
Open the connection box of the supply cable installation and use the lever on the inside to earth the uppercarriage. Close the connection box and keep the key in a safe place. Always use adapted tools suitable for the voltage. Workplaces should have a written lockout procedure for each machine, depending on your country, outlining:
A Safe Work Procedure has been developed by Liebherr-Mining Equipment Colmar SAS for its electrician personnel working on electric plant of an electric machine. This document is available in the Service Manual for information and must be adapted to your local electric regulations and procedures. Some electric components (such as high voltage supply cable, transformers, motor windings...) store some residual electric power. Before working on electric circuit including such components, you must discharge these components to the earth. Concerning work with voltage on electric system, Liebherr-Mining Equipment Colmar SAS recommends to lock and tag out (power OFF) at the supply station or at the field switch in case of any maintenance or work on electric risks areas. People must be trained and certified from their employer according to the electrical local regulations.
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