Description

Type 4010 is a simple, easy-to-understand system with smooth, timed or frequency responsive acceleration and plugging control of wound rotor motors used on travel motions for all types of cranes.  The motor is started with all the rotor resistance in the circuit.  Clapper contactors in the controller short out the external rotor resistance in timed or frequency responsive steps, under control of a master switch, to provide smooth and rapid acceleration.  During reversing, a frequency sensitive plugging relay prevents all of the secondary resistor contactors from closing until the motor is practically at rest.  This keeps all of the external rotor resistance in the circuit during reversal to provide safe, controlled stopping.

Type 4010 reversing-plugging control panels are suitable for use with ac wound rotor motors on crane bridge or trolley travel drives.  These panels can also be used on any reversing drive that is non-rectifier operated dc brakes.