Description

Type 4110/4120 travel controllers provide reversing/plugging control of series or compound wound DC motors.  The simple easy-to-understand system has smooth timed responsive acceleration and rectified type plugging.  The motor is started with all the resistor in the circuit.  Contactors in the controller short out the external resistance in timed steps under control of a master switch, to provide smooth and rapid acceleration.  During reversing, a plugging relay with rectifier prevents all the accelerating contactors from closing until the motor is practically at rest.  This keeps all the resistance in the circuit during reversal to provide safe, controlled stopping.