TRAK-DT ( Item #365)
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USED FOR
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The only nonoptical detection system on the market that provides block detection without interference to the electrical power operating your trains. This means that all carrier operated layouts need not worry about distortion of their signal to the track. Conventional operators will not suffer from any loss of power or the need of separate power sources for each block detector used! The TRAK-DT family of devices provide detection by sensing the flow of electrical current in a wire that is passed through a hole in the detection coil of the device (similar to clamp on current probes). These devices are electrically isolated, but function as if they are in series with the current flow. |
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The basic TRAK-DT activates its double pole, double throw (DPDT) relay when current flow is sensed and the relay is relaxed when current ceases to flow. By connecting the relay to lights, accessories, other electronic devices, signals or even track power, all forms of automation and/or indications become possible. A two pin connector is available so that an additional relay (Item 555) can be added when extra contact sets are required. To detect a train on track it is necessary to isolate a section of rail (for 3-rail, center rail is easiest) defining the block length and to pass the wire feed for this rail section through the detection coil of the TRAK-DT. By interconnecting several TRAK-DT's (one per block) complex signal systems can be installed, including fully automatic operation if so desired. The TRAK-DT is also equipped with a RED LED which illuminates when the TRAK-DT senses current flow. The LED provides for an easy visual indication for activation.
It is also necessary to provide power for the electronics. In order for the electronics to function properly it is essential that a "regulated" power supply of 12 VDC be employed. This 12 VDC power is only for the electronics and has absolutely nothing to do with track power. Failure to use a "regulated" 12 VDC can cause erratic functioning or actual destruction of the TRAK-DT. The 12VPS (item 369) is ideal for this function. | |
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Relay Contacts electrical diagram
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Relay contacts are used on most all of our Signaling Components. These are used since they are the most forgiving when mis-wiring occurs and they provide for electrical isolation of the load to the circuit.
When the relay is relaxed the "C" Common terminal is connected to the "N/C" Normally Closed. When the relay is activated the "C" Common terminal is then connected to the "N/O" Normally Open terminal. The relays used on our circuitry contain Double contact sets indicated by section A and section B. Remember a relay is nothing more than an electrically activated switch! |
