The appearance of any failure state determines the disconnection of the fixed coil, the failure being indicated as a fault on the electronic control unit and on the equipment door, by lighting lamps.
Rotor static converters type CSR-(100÷1000)-P are aimed to start non-synchronous motors with wound rotor supplied from ^KV, of 100÷1000 KW powers.
The static rotor converter works inbuilt in an adequate electric circuit, according to its role in the driving assembly.
The belt carriers are driven by non-synchronous motors with wound rotor of 630 KW whose rotors are directly connected to the electronic equipment type CSR-630-P which achieves the start. The actuation of driving motors is independent.
After the fixed coil connection at the voltage of 6 KV, the rotor contactor being opened, the equipment CSR-630-P receives on the input terminals the maximum voltage of 1000 V ac and it begins to set the rotor circuit resistance up to the moment when the rotor voltage decreases at its minimum value. In this moment the rotor contactor receives the control to close itself, the transitive process of starting is ended and the motors operates at the nominal rotations per minute. The rise of rotor current is slow so that the motor should start without mechanic shocks to be transmitted to the driving( reducers, belt carriers, etc). During the whole start the rotor current is measured that means the reaction size for the chopper.The using of the equipments of CSR-(200÷1000)-P manufactured by INDAELTRAC S.A destined to start non-synchronous motors with wound rotor driving the belt carriers in surface mining exploitations has the following advantages: