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MTA Staten Island Railway Automatic Speed Control: A hybrid of the PRR/LIRR systems and Rapid Transit power-frequency cab code. The ATC applies service braking in response to overspeed conditions. 75-120-180-270 are used as speed commands. Zero code is used for stop rather than restricting, which is 50PPM. 420 is used as a latch-out.
The key feature of the Ward Leonard control system is the ability to smoothly vary the speed of a DC motor, including reversing it, by controlling the field and hence the output voltage of a DC generator, as well as the field of the motor itself. As the speed of a DC motor is dictated by the supplied voltage, this gives simple speed control.
A governor, or speed limiter or controller, is a device used to measure and regulate the speed of a machine, such as an engine.. A classic example is the centrifugal governor, also known as the Watt or fly-ball governor on a reciprocating steam engine, which uses the effect of inertial force on rotating weights driven by the machine output shaft to regulate its speed by altering the input flow ...
An electronic speed control follows a speed reference signal (derived from a throttle lever, joystick, or other manual input) and varies the switching rate of a network of field effect transistors (FETs). [1] By adjusting the duty cycle or switching frequency of the transistors, the speed of the motor is changed. The rapid switching of the ...
In the event a train's crew exceeds a speed restriction a penalty brake application is applied bringing the train to a complete stop [3]: 350 in the same fashion as existing automatic train control (ATC) systems. Speed restrictions required by the signal system are provided by the legacy Pulse code cab signaling system, which has been in ...
France's government collapsed Wednesday after Prime Minister Michel Barnier was forced out in a no-confidence vote in Parliament, reigniting a summertime political crisis for the country as it ...
The NCOA offers an online benefits tool that can connect you with programs to help pay for health care, medicine, food, utilities and more. Just enter your ZIP code to get started. Just enter your ...
In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system , as a safety interlock , or as a counter enumerating objects passing a point.