Precise load sharing. Although our Liquid Resistor Starters produce a very good load sharing, there is no dedicated control to ensure that the torque of both motors is identical during the complete starting process. The Resistance Chopper Starters controls the starting current in all motors at the same time to ensure that the unbalance between the motors is lower than 1%. Unsymmetrical grid voltages, different wearing on mechanical components of the drivetrain, etc. does not result in any current unbalance between the motors.
RCS are commonly used in starting dual pinion mills as well other critical slip ring motors (i.e. pony motors of hydro-pumped plants, very large motors, etc).