For decades, electromechanical code transmitters have been used to generate the pulses of coded track circuits. While these transmitters are reliable performers, their precise, somewhat complex mechanisms require periodic inspection and maintenance. US&S has developed a more cost-effective, yet equally reliable alternative. The PN-250CG is a solid-state code transmitter replacement for equivalent US&S plug-in electro-mechanical encoders.
In electromagnetic code transmitters, an electro-magnetic circuit sustains the motion of a pendulum to generate a pulsed signal, or code, which is transmitted through the rails. The pendulum alternately opens and closes a set of contacts at rates of 50, 75, 120, 180, 276, and 420 times per minute (codes per minute or CPM). The code rates depend on the pendulum's natural period of oscillation. The PN-250CG solid-state coder electronically duplicates this operation. The US&S PN-250CG is a solid-state code transmitter that is a direct replacement for US&S electromechanical coders. The PN-250CG replaces the US&S PN- 250TR relay. This new code transmitters is available in versions for either driving traditional code following relays (using low voltage contacts) or for directly switching 110 Vac (using high voltage contacts) at any selected code rate applied directly to the rail.
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