To complement the range RLV, the EM-type automatic starter is designed to start slip rings motor, requiring high power or very soft starts.
This team not only ensures a excellent start, with progressively higher speed and smoothly, but also responds to specific needs, such as speed control slip rings motor and counter-current braking.
Its principle is introduced into the rotor circuit a variable electrolytic resistance through three movable electrodes, which progressively reduced the distance between phases and neutral, and with her resistance, yet this set immersed in an electrolyte at a constant level.
That is whay you can get a wide range of resistance variation ( up 1: 100) by the displacement of the electrodes inside the electrolyte.
At the start end the resistance is removed by a short-circuited contactor.