User Manual

BASIC

INSTALLATION

DIAGRAM

Atlas recommends that the SCB be mounted under the table with the supplied bracket. However,

all the SCBs can be mounted in a central location anywhere on the layout. The shed can be

located on either side of the track in relation to the signal, for static display. (See diagrams on

next page for under the table positioning and installation.) Run the red (PWR, + ) and black

(COM, -) power wires (available separately) from the J4 terminal strip (PWR) of the SCB to

power leads of the unplugged source of power, (6-22VAC or DC power pack). See pages 7-8

for definitions.

DEFINITIONS

TS1

PWR IN - Power from transformer or power supply

TO TRK - Wire to insulated rail used in block

LED 1 - Used for visual indication of block occupancy. Will be lit

whenever the block is occupied

TS2

PWR - Signal Control Board (SCB) power 6-22VAC or DC

DET - Detector output connects to “DIN” of Signal Control Board

COM - Common or return from power supply

SPARE - Unused connection

C. BLOCK DETECTOR BOARD (BDB)

D. THE BASIC INSTALLATION OF ONE SIGNAL

Now that you have familiarized yourself with the SCB and BDB diagrams and definitions on

pages 7-8, you are ready to install your first signal using the basic installation diagram on page

10. The initial step is to determine the signal location. The signal is normally placed at the

entrance to a block. (A block is any section of track that is electrically isolated from the rest of

the layout.) Next to a straight track, the signal should be positioned approximately 8-10 scale

feet from the outside track edge. Placing a signal on a radius should be carefully done in con-

sideration of your longest rolling stock. Experiment with a variety of cars to determine the cor-

rect space from the outside track edge.