. Electric railways, theoretically and practically treated . (Open.) (Closed.) Fig. 89.—CONTROL SWITCH. An electrical interlock is provided on the reverse switchso that the switch group cannot be operated unless thereverse switch is fully thrown in the direction indicated bythe controller. The Controller.— The controller, which governs the actionof the switch groups throughout the train, is located in themotormans cab. It is of simple and compact construction,measuring approximately 7 in. high, 6 in. wide, and 4 It consists (Fig. 89) of a movable drum and sta-tionary contact fingers w
. Electric railways, theoretically and practically treated . (Open.) (Closed.) Fig. 89.—CONTROL SWITCH. An electrical interlock is provided on the reverse switchso that the switch group cannot be operated unless thereverse switch is fully thrown in the direction indicated bythe controller. The Controller.— The controller, which governs the actionof the switch groups throughout the train, is located in themotormans cab. It is of simple and compact construction,measuring approximately 7 in. high, 6 in. wide, and 4 It consists (Fig. 89) of a movable drum and sta-tionary contact fingers which are electrically connected to TYPES OF CONTROL AND THEIR OPERATION. 141 the various magnet valves. On the exterior is an operat-ing handle and a dial, indicating three positions for eachdirection of the car, the off position being in the Fig. 90.—LIMIT SWITCH. The operating circuit is supplied from a 14 volt storagebattery, and includes the controller as the operating device,and the armatures of the magnet valves on the switchgroups as the parts actuated. 142 ELECTRIC RAILWAYS. In the off position of the controller all unit switchesare open. The first position throws the reverse switchforward or reverse, according to which side of the centerthe operating handle is moved, and connects the motors inseries with four steps of resistance, giving a position forshifting or slow speed running. The second position closes the unit switches in such amanner that the four steps ^of resistance are successivelycut out by means of the automatic action of the interlocks,this action continuing until the motors are in series withno resistance. No further changes will take place until the handle ismoved to the third position. Then the change from seriesto multiple connection of the motors, with three steps ofresistance in series, is sm
Size: 1464px × 1707px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkvannostrand
