OPERATING INSTRUCTIONS RH 120 E Inspection and servicing ELECTRICAL SYSTEM Electrical system - Safety instructions
Battery main switch The battery main switch (Fig. 3-17:) is located in the pedestal above the batteries.
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. Fig. 3-17:
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 thespare-parts list. Further information can be found in the Technical Handbook "Working with circuit diagrams".
On withdrawal of the key from the key-switch (control panel in cab), the electrical lines from the key-switch to the consumers are de-energized. The lines from the batteries to the key-switch, however, are still energized. 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. Battery main switch (Fig. 3-17:):
Interrupt electrical circuits with the circuit breaker and the battery main switch before working on the electrical system. This prevents accidents, inadvertent starting of the electric motor, and short circuits.
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Position I = ON
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Position 0 - OFF
In switch position 0 the lever can be withdrawn from the battery main switch.
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. Gas-discharge lamps (optional) are operated with high voltage.
BA RH120E(3 668 330.00)-EN
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