Railway and Locomotive Engineering . oltage of the storagebattery ? A. Usuallj a . liattery uf from22 to 32 volts is used. Q. What is the general arrangement ofthe control circuits? A. The battery power is connected to aI>iccc of apparatus known as the mastercontroller. This master controller is lo-cated adjacent to the air brake valvesand provides the means for connectingthe battery current to a system of controlwires which run from the master con-iriilkT to the unit switches. The energiz-iii!» of a control wire operates a small air\alve allowing the air pressure to entera cylinder
Railway and Locomotive Engineering . oltage of the storagebattery ? A. Usuallj a . liattery uf from22 to 32 volts is used. Q. What is the general arrangement ofthe control circuits? A. The battery power is connected to aI>iccc of apparatus known as the mastercontroller. This master controller is lo-cated adjacent to the air brake valvesand provides the means for connectingthe battery current to a system of controlwires which run from the master con-iriilkT to the unit switches. The energiz-iii!» of a control wire operates a small air\alve allowing the air pressure to entera cylinder moving the piston and therebyclosing the switch. The power from themain circuit is connected to the switch sothat the .closing of the switch throws theI lower on to the motors. These unitswitches are grouped together in numbersvarying anywhere from 6 to 12 or evenmure. The group of switches is calleda switch group. Fig. 11 shows a switchgroup made up of 11 switches. Each ofthese 11 switches is a unit and is inter-changeable. /-6fl. FIG. 12. CROSS SECTION DRAWING OK THE SWITCH GROUP. September, 1916. RAILWAY AND LOCOMOTIVE ENGINEERING. 317 Q. What is the construction of one ofthese units? A. A cross section through one of theseswitch units is shown by Fig. 12. Theair is piped into the end of the group andsupplies air at 70 pounds pressure to thesmall reservoir R running the wholelength of the group. Each of the cylinder A. When the engineer shuts ofif themaster controller, the battery current isbroken from the control wire, the coilC is no longer energized, no attractiontherefor on the armature P andthe small valve V closes on its seat bymeans of the spring S, tliereby cuttingott the air prcssiiri- fr^rn llu- passagrway FK;. U. C^XINDER .\ND VALVE and magnetic valves shown by Fig. 13 re- air from this reservoir R throughthe nipple N, gaskets G being used toprevent leakage of air. The 70 poundsair pressure is therefore always availablearound the head of
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyork, bookyear19
