. Electric railway journal . the switchingposition, all reversers in the train are first thrown forwhatever car direction is indicated on the controllerin use. The circuit controlling the operation of theline breaker is next established. To insure a correctsequence of operations the line breaker is not allowedto close and complete the motor circuit until the re-verser has thrown to the proper position. When the handle is moved to the accelerating points,the train accelerates automatically at a pre-determinedcurrent per motor. A current-limit or notching relaylimits the accelerating current and
. Electric railway journal . the switchingposition, all reversers in the train are first thrown forwhatever car direction is indicated on the controllerin use. The circuit controlling the operation of theline breaker is next established. To insure a correctsequence of operations the line breaker is not allowedto close and complete the motor circuit until the re-verser has thrown to the proper position. When the handle is moved to the accelerating points,the train accelerates automatically at a pre-determinedcurrent per motor. A current-limit or notching relaylimits the accelerating current and stops the rotationof the cam shaft when the pre-determined current isreached. When the motor current drops to the correctvalue the progression is again started. The controller handle is automatically returned tothe off position by a spring so that power is cut offwhenever the motorman releases his hold. The releaseof this handle permits a knob to rise and thereby actu-ate a small air valve in the controller for applying the. BELMONT TUNNEL EQUIPMENT—CONTACTOR UNIT FORMOTOR CONTROLLER brakes simultaneously with the cutting off of power. These two features are provided for the pur-pose of bringing the train quickly to rest in case themotorman becomes incapacitated. In the event of theline breaker opening, due to an overload, the motormanre-establishes the closing circuit by operating the reset-ting switch in the cab. The special features of the new control are reportedas follows: A definite sequence of contactor operationis established both when going off and on, clue to themechanical control of the contactor units, and this pre-vents trouble that might occur from improper func-tioning of independently operated contactors. Inter-locks on the contactors are eliminated. The electriccontrol circuits are simple. The simplicity and com-pactness of the apparatus permits the assembly of con-tactors, reverser, line breaker, relays, etc., in one boxas a single unit, making the installa
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
