Identifier: cyclopediaofappl05amer (find matches)
Title: Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc.
Year: 1916 (1910s)
Authors: American Technical Society
Subjects: Electric engineering
Publisher: Chicago : American Technical Society
Contributing Library: Northeastern University, Snell Library
Digitizing Sponsor: Northeastern University, Snell Library

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es. The twelve contactors areshown in a row in the lower part of thediagram, and numbered consecutivelyfrom 1 to 12. By means of them theconnections are made as in the smalldiagram and the contactor table, both ofwhich are in the lower right-hand corner.The diagram is for a four-motor equip-ment, but as each pair of motors can be treated as a single motor—the motors of the pair being connectedpermanently in parallel—but two motors are shown in the smalldiagram. The contactor table enables us to determine at a glancewhich contactors are closed at each of the ten master controllerpositions. There are 12 vertical and 10 horizontal columns in thetable. By reading horizontally along any lines corresponding to acontroller step, we note by the positions of the dots the number of thecontactors in operation. For example on step 1, contactors 1,2, and8 are closed, etc. The motor circuit diagram shows the locations of thevarious contactors in the motor circuits. The locations are as follows:
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Fig. 64. Sprague-General ElectricMaster Controller 157 62 ELECTRIC RAILWAYS (1 (2 (3 (4 (5 (6 (7 (8 (9 (10 (11 (12 Between trolley T and one motor (or pair of motors). Between the second motor and the resistance grids. In the jumper or short-circuiting wire around a resistance grido In the jumper around the second resistance grid. In the jumper around the three lower resistance grids. In the bridge connection between the two motor circuits. In the trolley circuit of the lower motor. In the wire connecting the two sets of resistance grids. Same as 5 but for the upper grids. Same as 4 but for the upper grids. Same as 3 but for the upper grids. In the ground circuit of the upper motor. The combinations shown in the contactor table produce the follow-ing connections: Step 1. Trolley—motor No. 1—all resistance grids—motor No.2—ground. Step 2. Trolley—motor No. 1—upper four resistance grids—motor No. 2—ground. Step 3. Trolley—motor No. 1—three sections of upper grids—m

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