. Electric railway journal . ng features, are accom-plished by three independent electric-pneumatic switches are of the HL type, which are providedwith magnetic blowout. The minor changes in motorcircuit connections, as required to accelerate the car,are accomplished by means of a drum type PK direction of motion of the car is controlled by apneumatically operated reverser. The operation of the car or train is governed by amaster controller which controls the operation of themagnet valves and thus directs the movement of theswitches, drum, and reverser, and regulates
. Electric railway journal . ng features, are accom-plished by three independent electric-pneumatic switches are of the HL type, which are providedwith magnetic blowout. The minor changes in motorcircuit connections, as required to accelerate the car,are accomplished by means of a drum type PK direction of motion of the car is controlled by apneumatically operated reverser. The operation of the car or train is governed by amaster controller which controls the operation of themagnet valves and thus directs the movement of theswitches, drum, and reverser, and regulates the opera-tion of the motors. One master controller is located ineach cab. Compressed air for operating the switches,drum, and reverser is obtained from the air-brake sys-tem through a reducing valve. The power for operat-ing the magnet valve is taken from the line voltagethrough a suitable resistor. The circuits from themaster controller are carried to a multi-conductor train 736 ELECTRIC RAILWAY JOURNAL Vol. XLVIII, No. 15. FRONT AND REAR VIEWS OF CONTROLLER BOX line from which branch circuits are run to each pieceof apparatus. This train line extends the entire lengthof the car and terminates in receptacles at each train line of any car may be connected to that ofany other car at either end by means of a jumperplaced in the adjoining receptacles, thus making thetrain line continuous throughout all cars. Operationof the master controller on any car will then operatethe respective pieces of apparatus on all cars simul-taneously. The control circuits for the unit switches, operatingdrum and reverser are so interlocked that the sequenceof operation is predetermined and the action of one partcan take place only when the other parts are in theircorrect relation. By means of a series limit switch, theacceleration of the car may be made automatic, thuspreventing excessive overloading of the motors. How-ever, each notch in series is registered on the mastercontroller, so that
Size: 2295px × 1089px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
