Signaling & Automation Equipment
Current Detection Type

OVERVIEW


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. These devices are electrically isolated, but function as if they are in series with the current flow. When current is sensed, a double pole, double throw (DPDT) relay is activated. 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.

  • TRAK­DT (TRAcK DeTector) (Item 365) The basic TRAK­DT activates its relay when current flow is sensed and the relay is relaxed when current ceases to flow. To detect a train on track it is necessary to isolate a section of rail defining the block length and to pass the wire feed for this rail section through the detection coil of the TRAK-DT.
  • TRAK­DTT (TRAck DeTector Timer) (Item 565) The TRAK­DTT is a variation of current detection that provides for event timing. The TRAK­DTT has two modes of operation:


    1. DETECTOR ­ TIME ADJUSTABLE. As with the TRAK­DT when current flow is sensed in the detection coil, the relay is activated, however with the TRAK­DTT in this mode, the relay is held activated for a minimum time period even if current ceases to flow. Should current flow continue beyond the time period, the TRAK­DTT functions just like the basic TRAK­DT. In other words, the TRAK­DTT activates for a time period or for the duration of current flow, WHICHEVER IS LONGER.
    2. TIMER. When current flow is sensed in the detection coil, the relay is activated for a time period (user adjustable) and then relaxes for the duration of current flow. Once current flow has ceased for a few seconds the time circuit resets.

  • TRAK­DTL (TRAcK DeTector Latch) (Item 366) The TRAK-DTL is a variation of current detection that includes a latching circuit to hold the relay position. As a result of this latching circuit, each time current flow is sensed by the detection coil, the TRAK-DTL changes the state of its relay.


 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 these devices. For proper power supply refer to the 12VPS


INDEX