OPERATING INSTRUCTIONS RH 340 Electric

Inspection and servicing

Electrical System

Electrical system - Safety instructions

Read and observe the "Inspection and servicing – Safety instructions" chapter.

Risk of injury caused by battery acid and gases.

Wear goggles, working gloves and firm working clothing.

Carry out voltage and continuity checks only by means of a test lamp or a measuring instrument. Do not check by "touching ground" with a bare wire. The short-circuit thus produced damages the alternator and the electronic modules of the PMS.

The electrical circuit diagrams are annexed to the spare-parts list. Further information can be found in the Terex O&K Technical Handbook "Working with circuit diagrams".

Cables and cable lugs must not get in contact with other metal parts. Replace broken or damaged cables and the respective cable lugs.

If a bulb does not work after replacement, the pertaining fuses, connection cables and contacts must be checked.

Interrupt electrical circuits with the circuit breaker before start working on the electrical system. All electric lines upwards from the circuit breaker are then without voltage (refer to the "Safety instructions for excavators with electric motor" at the beginning of this chapter).

Before starting live-line servicing work e.g. measuring and testing with voltage applied, press switch (4, Fig. 3-21:) and secure it w ith a padlock. Now voltage is supplied to the whole system but the electric motor can not be switched on. This prevents accidents, inadvertent starting of the electric motor, and short circuits.

The 24V circuits are energized by the two batteries when the circuit breaker is switched off. These lines can also be de-energized with the battery main switch. Shut off the electrical system with the battery main switch when carrying out repair work or during prolonged downtimes of the excavator.

Gas-discharge lamps in Xenon working lights are operated with high voltage.