Digitrax BDL16 Informasi Instalasi - Halaman 3

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3.0 Track Wiring for Detection with BDL16

BDL16 comes from the factory set up for DCC operation on layouts that use

direct home wiring. Direct home wiring is the wiring method recommended by

Digitrax. With direct home wiring, each power district and its booster is elec-

trically isolated. This method of wiring has safety advantages and makes detec-

tion work more prototypically. The track within each power district can use

"common rail" wiring for detection or power management. In most cases, the

BDL16 will work as it comes from the factory with direct home wiring when

its 44 pin socket is wired to the layout and connections are made to a 12V AC

power supply (100mA minimum), booster power and ground. Figure 1:

Typical Direct Home Wiring, shows the typical usage of a BDL16 operating

all 4 zones from a single booster, i.e. in a single power district. A single

BDL16 can be operated by up to four different boosters.

With direct home wiring, the BDL16 can determine & indicate whether any of

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

ing on the rails in the detection sections. The BDL16 default 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 default matches prototype

detection safety practices.

Whole layout common rail is a method of wiring layouts where power districts

and their boosters are electrically connected using a common rail or common

power bus return wire. Whole layout common rail wiring is at a disadvantage

when it comes to detection systems since detectors cannot independently moni-

tor whether zone power is on or off so they can't tell whether occupancy detec-

tion is working or not in any given detection section. To get around this limita-

tion, the BDL16 uses option switch 10 to set up detection section 16 to be used

as a zone power detector for detection sections 1 through 15. Wire a 10K resis-

tor from detection section 16 (not connected to tracks) to the detection common

return for the whole BDL16. Then detection section 16 on the BDL16 will be

active when the BDL16 sees track power and you will be able to tell whether

detection is actually available in detection sections 1 through 15.

4.0 BDL16 Installation

TABLE I shows the pin-out for the BDL16's 44 pin connector. Be sure to wire

the BDL16 ground wire to the Digitrax Booster ground, common (or case) of

the boosters. Wire the track outputs to the appropriate detection section follow-

ing the example in Figure 1. The Zone common connections to the booster

should be as short as possible and relatively heavy gauge, since they are com-

mon to all four detectors in the zone. For example, a 12awg zone connection to

the booster should be less than 10 feet for best performance. For whole layout

Figure 1: Typical Direct Home Wiring

LocoNet

to other LocoNet

PS12

Devices such as

(Throttles, Boosters,

12 VAC

UP3's Etc.)

Power

Supply

Note: BDL16 Zone A Wiring

shown for clarity. Zones B, C,

and D are wired similarly.

Option LED (red)

ID LED (green)

DS 16

DS 15

DS 14

DS 13

Zone D

DS 12

DS 11

DS 10

DS 9

BDL16

Zone C

Ext. Power

Booster GND

Top View

DS 8

DS 7

DS 6

DS 5

Zone B

DS 4

DS 3

DS 2

DS 1

Zone A

External LED

Connectors (pin 1)

(See Figure 4)

Direct Home Booster (Digitrax standard)

L O C O N E T

S C A L E

M O D E

O / G

R U N

P P

H O

S L E E P

POWER

T R A C K

S T A T U S

O F F L I N E

Zone Common

(Heavy Wire)

Detection Common

Booster Ground to pin 11

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