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.