OPERATING INSTRUCTIONS RH 340 Electric OPeration

Circuit breaker, switching on and off

By means of the circuit breaker the supplied medium voltage 6.6kV can be connected to the excavators electrical system or can be disconnected from it. The circuit breaker is installed in the control cabinet 7.2kV (Fig. 2-76: and Fig. 2-77:).

Switching the circuit breaker on is possible only when PLC and motor protection relay enable thie function. In this case, monitoring lamp (2, Fig. 2-77:) lights up.

The circuit breaker is operated with an actuating lever which is stored in a fixture inside the control cabinet 7.2kV.

Switching on the circuit breaker

 Unlock cover over actuating shaft (1, Fig. 2-77:) and flip it upwards.

 Slip actuating lever (Fig. 2-78:) onto the actuating shaft of the circuit breaker. Pull locking element outwards against spring pressure.

 Turn actuating lever by ca. 180° to the left (Fig. 2-78:). This tensions the cut-out spring.

 Turn actuating lever (Fig. 2-79:) by 180° to the right. This tensions the cut-in spring and the circuit breaker is switched on.

 Engage locking ring.

 The indicator lamps "7.2kV OK" (1, Fig. 2-80:) and "PHASE SEQUENCE OK" (2) comes on at the control cabinet 400V and at the control column in the driver's cab.

 Withdraw the actuating lever and put it into its fixture.