Dcc systems for model railroads,atlas ho switch machines,21 pin dcc decoder,o27 gauge model trains - Step 2

What is Train Brain?This is a circuit board made by CTI Electronics that brings a whole new meaning to the words a€?layout controla€?!Model railroad computer control used to be very complicated.
Another good point is that you can still use your walkaround Digitrax throttle whenever you wish to walk away from the computer screen and follow your trains. DCC Protection and Detection SystemsA DCC command station or booster putting out 5 Amps of 12V power is powerful enough to weld metal or melt plastic when things go wrong.
Electrical PhotosThis album contains photographs of the power wiring and related systems of the Sumida Crossing layout, both train power and scenery lighting. The items displayed and sold on this website are not toys, may contain small parts,and are not designed nor intended for children under 14 years of age. Instead of controlling the speed of your locomotives by increasing or decreasing the direct current (DC) voltage running through the track, or changing direction by changing its polarity, a small electronic circuit board inside the locomotive controls both the speed and direction of the motor.
Track power and hence the power supplied to the decoder is a form of alternating current (AC). Because the input from the track is AC and the locomotive motor runs on DC, it is mandatory that the locomotive motor be electrically isolated from the wheels which are used to pick up power from the track.
The last two items are often combined in a single unit, or if not, are usually purchased together when you buy your DCC system. If it's not included in the base package, you can purchase the proper power supply from the same manufacturer as the throttle and command station, or you can source your own. When you, via the throttle, issue the command for locomotive #1234 to move at, say, one quarter of full speed in a reverse direction, the command station writes a data packet that is addressed to, and only read by, the decoder in locomotive #1234.
Once the instructions have been received by the decoder it will blindly follow them until told to do otherwise. You can probably reckon on spending between $175 for a basic DCC system to over $500 for a top-of-the-line wireless system. Tablets and smartphones are now ubiquitious and, thanks to inexpensive apps, can be programmed to operate as throttles. The evolution of hi-tech DCC decoders has outpaced the programming power most DCC Systems can provide! These systems have circuit breakers that cut the output in a short, but even then they don't react as swiftly as desired sometimes. While it includes some DCC material, more is to be found in the DCC Systems album.Click on images for a larger version and the slideshow controls. Most modellers use either the last two or last four digits of the locomotive in which it’s installed.


This means that even if you unplug the throttle the locomotive will keep on obeying its last instruction.
The Nottawasaga Model Railway uses both, and you may have noticed that some of us have to plug our throttles in to one of a number of communications ports situated around the layout while others don’t have to plug in at all.
This is because not only is power being carried through the wires and track but also a high-frequency communications signal. Tablets are especially popular because their size allows you, if you have the dexterity of a one-armed paper hanger and the reactions of an F1 racing car driver, to run up to four locomotives at the same time from a switch list that's also being displayed. It does this via a very high frequency square wave signal that travels through the track with, but independently of, the AC power supply. It’s recommended that you solder the connectors to the rails at every second joint in the track, leaving alternate joints unsoldered to allow for expansion. It's also recommendation that the feeder wires from the bus be soldered to the track every six feet.
Most, although not all, low end systems can be added to, to make them equal to their high-end brothers.
These sections have 14ga solid wire soldered at each end and this wire fits snugly against the permanently fixed track on the module.
So the remainder of the layout was done using separate boards that hang down below the layout, and which (with the disconnection of a couple-dozen screw terminals) can be removed if they need major work done. One of these panels is shown below:Power Protection and Detection Panel (PM42 left, BDL168 right)Another interesting thing from this note is the example of wiring PM42's with BDL162s showing both powered by the same power supply (a PS515 powering two PM42s, ten BDL162s and an unknown number of DS54s).
This helps to remove any concern I have with using the same "accessory" supply for my PM42s, BDL168s and DS64s). While the note is about the older BDL162, not the current BDL168, there should not be a significant difference in their power needs.
One important point is that they do show two additional PS515s being used for track power with the two boosters, so that reinforces the need to keep the track power separate from the PM42 power. In the end, I went with separate accessory power supplies for the set of PM42s (Protection Accessory Power) and the set of BDL168s (Occupancy and Signaling Accessory Power). This led to more electronics than might have been needed (and a significant increase in cost), but gave me simpler, more modular wiring to facilitate moves, and shorter and less complicated distribution wiring. It was also an annoying amount of work, thanks in large part to Digitrax’s use of soldered edge strips.
I either need individual supplies (Digitrax's recommended solution, but that's a lot of wall-wart transformers) or an independent but fairly large accessory power supply.


One panel will be associated with each table (each "scene" is a set of two tables) which eliminates almost all table-crossing wires. Terminal strips along the upper edge allow short jumpers to connect it to the underside of the table. It needs to hang two inches below any power wiring to isolated the transponding sensors, but that's easy enough to achieve.Mounted on the panel is a PM42 providing four DCC circuit breakers, and a BDL168 providing block occupancy detection and transponding. There are also eight RX1 sensors connected to the BDL168 which do the actual transponding detection.PM42 and BDL168 WiringThis is an area of significant confusion, both on my part, and from their rather schizophrenic documentation on Digitrax's part as well. While you can wire 18 gauge stranded wire to the connectors on these with a bit of effort, it’s a lot easier to use 20 gauge. You need to avoid to avoid long runs of that, but assuming you’re working with a 5 Amp booster, you can stick with short lengths of 20 ga or even 22 ga from the input terminal strip to the input connector of the PM42.
Each output MUST be wired to one pin of the two provided connector pins (one on the side of the connector identifying pins with letters, and the matching one on the numbered side) unless you are using it for reversing, in which case it MUST be wired to both. But the manual makes no mention of this beyond the connector wiring tables (table I and table II). Sharing outputs is done by running more than one wire through an RX1, although I believe they all need to be the same phase (since all wiring to the BDL 168 only uses one phase, this is easy enough to do).
This may be due to the old (and slow) computer I’m using, and could be a sign of future problems.
These will be designed such that I can rearrange the transponding sensor assignments or the circuit breaker to detector association in the future, just by moving some wires between terminal strips. As such, even through they’re supporting different configurations, 90% of the work will be identical on all three. And I’m building all of them to support use of all 16 BDL168 outputs, even though two of them need only seven and the third needs only six today. Here's the initial output at power-up of the detection board (the Zephyr was powered up earlier, so you don't see its start-up messages here):Note that the first number after the "PM4" is the address of the PM42, in this case "1". The latter increment with the address, so BDL168 #2 contact 1 reports as "BDL 2, 1" and "switch 9 Aux".
I haven’t yet figured out if the channel numbers equate to unique accessory decoder addresses or not.



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