. Electric locking . adjustment to secure the opening of theSS circuit when the switch points have moved not over 34inch from the stock rail in either position and hold the contactsopened until the switch points have closed to within J4 inch ofthe opposite position. Such adjustment of these switch circuitcontrollers, while not specially required for the control of thethree-position SS relays, will be found very desirable, as itprecludes the possibility of any wrong adjustment of the switch. Fig. 59 shows the SS circuit arrangement for a single switch,E being the relay and F the switch circuit
. Electric locking . adjustment to secure the opening of theSS circuit when the switch points have moved not over 34inch from the stock rail in either position and hold the contactsopened until the switch points have closed to within J4 inch ofthe opposite position. Such adjustment of these switch circuitcontrollers, while not specially required for the control of thethree-position SS relays, will be found very desirable, as itprecludes the possibility of any wrong adjustment of the switch. Fig. 59 shows the SS circuit arrangement for a single switch,E being the relay and F the switch circuit controller. The 66 INDICATION LOCKING key to the circuit controller adjustment is shown in sketch A,indicating at what points each contact should make and breakthrough a complete cycle of a switch operation at places where a34 inch switch point adjustment is standard. It will be notedthat the polarized character of the circuit is obtained by the cir-cuit controller acting as a polechanger, which reverses the current. Al- I cl ■ I I -r HC -\^ FIG. 59. fA) through the SS relay. These contacts are also arranged sothat, when the switch is in transit or is not fully locked at normaland reverse, the two wires leading to the SS relay in the towerwill be short circuited or placed on a closed circuit by means ofwire G, and the relay will therefore not only be de-energized,but will be absolutely short-circuited. The protection againstcrosses and false indication, secured not only by this short cir-cuiting feature, but by the polarized character of this scheme ofindication and its entire isolation from all other circuits or com-mons, will be evident.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
