TTB 665 motor includes 2 inductors and 2 armatures on a single shaft with individual commutators in the midle of the shaft. These motors are self cooled.
CC 6500 have 2 power variators driven by a single actuator. 28 positions are used.
The two J.20 and J.21 inverters as well as the two traction/braking switches may be driven manually by a lever located under lock box.
1°) Series coupling
Series coupling is obtained by a lever located on the control panel. At the end of series coupling, power variators are in position 28. Series coupling is optional. It is used to limit intensity when locomotive starts on service tracks equipped with limited section overhead wire.
To switch from series to series-parallel coupling, driver must put back traction control wheel at « zero » position and put series coupling lever on off.
2°) Series-parallel coupling
If series coupling lever is on off position, start occurs on series-parallel coupling. At the end of series coupling, power variators are in position 28.
3°) Parallel coupling
Variators in position 28 series-parallelthen switch to position 29, coupling motors in parallel resistances being inserted again. Resistances elimination takes place between variators positions 29 to 48.
Control panel includes a variator position indicator with 2 windows:
The first one allows reading variators positions for series and series-parallel couplings (1 to 28).
The second one indicates positions for parallel coupling (29 to 48).
Starting rheostatis cooled by two groups of three fans each. These fans start once resistances are crossed by current. They stop when all resistances are eliminated from traction circuit.
Spin detection is made by comparing traction motors respective speeds with "ROCHAR" relays. When a spinning occurs, a pictogram appears on control panel, variators actuator stops progressing and sanding starts. In addition on series and series parallel couplings, contactors switch to the shunt motor rotor affected by spinning. This reinserts resistances that had been previously eliminated.
HIGH VOLTAGE AUXLIARIES
Batteries charging is done by a static converter. This converter produces a chopped current from 1500V DC current coming from overhead wires. This current provides power supply to a transformer primary which itself provides power to :
- Batteries charging in 72V, windscreen heating, and dish heater ;
- Auxiliary batteries charging in 30V which will be used for emergency dynamic braking ;
- Power supply for dynamic braking alone or combined with pneumatic braking.
CC6500 are equipped with dynamic braking. It is used alone manually for slowing down or put on automatically during pneumatic braking.
25 positions can be used :
From position 1 to 8, resistance value is constant, excitation current increases.
From position 9 to 25, excitation is maximum, resistance value progressively decreases.
CC 6500 are equipped with :
- A JRP 66 P 5000 electro pneumatic circuit breaker requiring a minimum operating pressure of 5 bar ;
- Two AM 18 B pantographs driven by a solenoid valve ;
- One compressor with a main reservoir under the chassis ;
- A PBL braking unit with electro pneumatic control.