Digitrax BDL162 Manual - Página 4

Navegue en línea o descargue pdf Manual para Sensores de seguridad Digitrax BDL162. Digitrax BDL162 13 páginas. Loconet occupancy detector

Figure 1: Direct Home Wiring Example

The key to proper wiring for occupancy detection is planning. Your layout will

be divided into detection sections that can range anywhere from several inches

to several feet in length. This process is somewhat subjective, with the number

and length of a detection sections varying depending on your layout, train

length and the purpose of the detection.

It is best to plan your detection sections based upon the operations you want to

accomplish on your layout before cutting gaps in the track and installing the

BDL162. For instance, a grade level signal crossing may require from two to

four different detection sections in order to create the effects you want with the

lights and gates operating for trains traveling in either direction. Signal lights

will require information from two detection sections in front of the signal in

order to function like the prototype. Detection is not only useful but critical if

operating a hidden staging area--occupancy detection will let you know which

tracks are occupied in hidden staging areas. In your initial wiring installation,

not all sections have to be connected to BDL162s; they can be connected to a

terminal strip and then to boosters or power management devices. Additional

BDL162s can then be inserted later as needed to further develop your layout.

Additional information about planning and installing the BDL162 can be found

on the web site in the document: Advanced Transponding Application Note

within the Digitrax Application Notes and Technical Information section of the

site. The form, BDL162 Planning Worksheet, is also available in the same sec-

tion for documenting your setup for future reference and trouble shooting.

Whether you are building a new layout or installing your BDL162 on an exist-

ing system, there are two basic wiring formats: direct home wiring and whole

layout common wiring.

3.1 Direct Home Layout Wiring

Digitrax strongly recommends direct home wiring where each power district

and its booster are electrically isolated. This method of wiring has safety

advantages and makes troubleshooting problems easier. In addition, direct

home wiring makes detection work more prototypically.

With direct home wiring, the BDL162 can determine and indicate whether any

of its 4 zones is powered or not (possibly short-circuited) even when there is

nothing on the rails in the detection sections. The BDL162 factory set logic

causes the detection sections to show "occupied" if the associated zone's power

is off (because in this case, detection is not possible). This factory setup match-

es typical prototype detection safety practices. Figure 1 shows an example of a

direct home wiring layout with a single power district with multiple detection

sections. zone A with 4 detection sections (1-4) and zone D with one detection

section (16) has been wired wired in this example.