The tram is driven by two DC series excitation motors developing an active couple proportional to the current value through the motor. The current average value by the traction motors is assigned by the travel pedals and it is maintained at this value by the regulating diagram.

The equipment for the tram drive with the help of IGBT choppers progressively passes the supply means tension to the traction motors which transform it in a mechanic energy at the tram wheels at the same time being monitored by motors not to exceed the maximum permissible values.

By breaking, the current assignment is done by the braking pedal but the electronic plug-in unit maintains the current at this value by motors and the voltage in the intermediate diagrams is maintained within the permissible limits. In this regime the motors work as generators. The braking is regenerating if the circuit permits (trams are in running), otherwise the braking is rheostatic but also at a prescribed braking current.

The electronic control plug-in unit avoids the indecision that should appear by the simultaneous depressing of the two pedals (travel and braking) by the priority to the brake. After the braking pedal returns in “STOP” position the travel regime resume is possible by actuating the travel pedal.

The reverse of the travel (reverse travel) is done from the tram driver’s cab but only when the vehicle is stopped.In this regime the run maximum current is limited at 50% of the forward run current (the maximum speed of the tram for the reverse travel is 30 km/h).

For all the running regimes (forward travel, reverse travel, braking) the contractors of the electric mains are disconnected at a minimum current thus avoiding their wear.

Both traction motor drive choppers as well as static converter for auxiliary power supply are achieved in IGBT technology.