OPERATING INSTRUCTIONS RH 340 Electric Inspection and servicing SAFETY INSTRUCTIONS FOR EXCAVATORS WITH ELECTRIC MOTOR Maintenance and inspection work on electrical systems may only be performed by qualified electricians or by workshops employing such personnel.
Connect to earth and short-circuit using extension (5, Fig. 3-3:). Connect the earthing and short-circuiting line (8) in the following order to points (1 – 4): - to the fixed point (1) and - one after another to the earthing points (2, 3 and 4).
A qualified electrician for the purpose of this regulation is a person who has the corresponding technical training, know-how and experience as well as knowledge of the pertinent prescriptions and who is therefore in a position to judge the work entrusted to him and the potential dangers in connection therewith. Before carrying out any maintenance and inspection work on the electrical system, the following precautions must be taken:
In the transformer station Cut out the supply voltage. Secure against switching on; apply a warning sign.
Fig. 3-1:
Check that the electrical system is off circuit. Connect to earth and short-circuit. Protect adjacent and live parts against accidental contact.
On the excavator Cut out the circuit breaker (see the " Switching off the circuit breaker " chapter in part 2 of the present operating instructions) Secure circuit breaker against switching on by locking the cover over the actuating shaft with a padlock (1, Fig. 3-1:). Apply a warning sign.
Fig. 3-2:
Loosen screws (2) and slide cover up. Slide in partition into guide (1, Fig. 3-2:). Check that the electrical system is off circuit and dead. Remove cover (2, Fig. 3-2:). Connect the earthing kit (8) to the earthing points (2, 3 and 4) only by means of extension (5). The earthing points may still carry residual voltages.
Fig. 3-3:
BA RH340(3 725 090.00)-EN
3-3
