File:Electric railway review (1906) (14758664995).jpg

Identifier: electricrailwayr17amer (find matches)
Title: Electric railway review
Year: 1906 (1900s)
Authors: American Street and Interurban Railway Association
Subjects: Street-railroads Electric railroads
Publisher: Chicago : Wilson Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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ch in the base of the controller, and the cutting out ofresistance and series-parallel combination changes are ef-fected in the usual manner. The circuit breaker tripping coils in the platform hoodsdo away with the necessity of an ordinary open circuitingautomatic switch at these points. The supply of the currentto the contactor solenoids is cut off whenever the main cur-rent in the tripping coils exceeds a predetermined limit.These tripping coils can be as readily reset by hand as anordinary circuit breaker, and the contactors cannot be ope-rated until both tripping coil switches are closed. The maincontactors are placed in series to increase their positivenessof action. The rheostats are located beneath the car as usual,and the wiring can be readily carried in armored conduits.The main hand-operated switches in the vestibules are usedonly to cut the current supply off the car for definite inter-vals. The auxiliary contactor-solenoid circuit is energized MS <S Sh»tc» J-3ACtKCU/T
Text Appearing After Image:
Diagram Showing Car Wiring with Multiple-Unit Contactors Series with Cylindrical Controller on Car Platform. control methods is illustrated herewith, the object of thedesigners being to adapt the contactor system of openingthe main circuit beneath the car to ordinary hand controllerequipments, without going to the expense of fully adoptingmultiple-unit control. In the drawing shown, the connectionsare given for a General Electric K28 controller modified soas to remove the main opening and closing of the trolley cir-cuit from the platforms. The circuits are for four motors,and the auxiliary car lighting and heating connections are in-cluded in the sketch. In this arrangement the trolley current cannot enter theplatform controllers until it passes through two manuallyoperated main switches and two circuit breaker tripping coilsin the platform hoods, through a main fuse beneath the carand two contactors in series, also located beneath the car. Inthe bottom of each controller is a mechani

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