Hmmm... er det virkelig ingen der ute som har et stort anlegg med NCE/SYS1??? Hadde jo i det minste håpa på at Eika eller andre fra Horten utbroderte om sine erfaringer da...
Men jeg kan jo fortelle litt om hvordan vi gjør det akkurat nå.
Vi har delt anlegg inn i 9 avsnitt som hver mates med strøm fra booster med en kabel med 4x2,5mm2 ledninger. Kun to av disse brukes til DCC. Den lengste av disse kablene er vel ca 12 meter. Foreløbig har vi kun den doble 2x5amp boosteren fra Sys1 slik at anlegget i praksis kun er delt i to, men vi regner med at dette må økes når vi omsider kommer igang med skikkelig trafikk. Derfor er det kjekt å ha delt inn i flere deler allerede nå.
Det skrives på flere steder at man bør sikre de enkelte avsnittene med sikringer som f.eks disse fra Tony"s Train Exchange http://tonystrains.com/products/type_powerprotect.htm - http://tonystrains.com/products/type_powerprotect.htm
Joe Fugate velger å gjøre det veldig mye enklere ved å bruke lamper til å "ta opp" kortslutningene istedet for en dyr og komplisert krets. Se her: http://siskiyou.railfan.net/model/constructionNotes/wiring.html - http://siskiyou.railfan.net/model/constructionNotes/wiring.h tml
Hvordan gjør dere dette i Horten?
Til cab-bus"en har vi hittil brukt den vanlige flatkabelen, men etter tips fra KnutP tidligere i sommer er det nå innkjøpt 4-leder med 0,75mm2 tversnitt som visstnok var dugelig til lange strekk. Et interessant innlegg jeg fant på nevnte NCE-diskusjon er:
-----Opprinnelig melding----- Fra: mailto:NCE-DCC@yahoogroups.com - NCE-DCC@yahoogroups.com [mailto:NCE-DCC@yahoogroups.com] På vegne av Mark Gurries Sendt: 14. september 2005 01:19 Emne: [NCE-DCC] How best to branch off a cab bus line?
Some thoughts.
Although you can create a "star" cab bus. It generally not recommended from a pure electrical point of view nor is it the way NCE designed the system in terms of normal cab bus expansion.
The official way to run the Cab bus is a single long cable that goes around the layout picking up each cab panel as it goes. If you buy NCE or TTX"s equivalent cab panel, they include a built in expansion connector to allow connection to the next panel down the line. "Daisy Chain" is the visual electrical description.
The key is a long linear chain that does not loop back on to itself (although on some HUGE HUGE layouts this appears to have solved some problems).
In this long chain, it is best to place the command station in the iddle of it so that there are two cab bus run of approximately equal engths going in different directions. This effectively cuts the bus run in half relative to the command station point of view. Be practical with this too. It does not have to be EXACTLY in the middle just somewhere in the middle.
Electrically, the cab bus is a RS485 serial bus. The RS-485 bus standards do not really recommend long bus "stubs". In fact each cab itself is already a small short stub as it is. In a star configuration, you just effectively making it much longer.
However, assuming the cab bus is wired functionally correct and you have a long cab bus, Cab bus failures typically are not of the go or No-go type. Problem with cab bus typically fall into the category of it works but its unreliable or it has random unexplainable operational events.
For those layouts with lots of noise or long cable bus runs, there are things you can do to minimize the noise.
1) Route the cab bus cable away from and not bundled with any other layout wires. Especially away from any track power wires.
2) Make sure you have plenty of cab bus power. Again NCE cab panels which are the same as TTX"s have an DC input jack on the back which allows a 12V 1A adapter to be plugged in. This is all documented in the cab panel manual. This also requires you to observe the correct jacks usage on the back of the panels with respect to which jack goes to the next cab panel and which jack goes back towards the command station.
3) Add a terminator to the end of the bus. Typically it is a 120 Ohm resistor in series with 0.01uF Ceramic capacitor. (Voltage not critical.) Adding shrink tubing to insulate the leads, I crimp my terminator into a RJ12 jack so it can move it around when I expand my jack system. I plug it into the last jack at the end of the line farthest from the command station. I add another terminator to the cab bus going the other direction.
Best Regards,
Mark Gurries Linear Technology Power Supply & Battery Charger Applications Engineer/Manager --------------------------------------------------------- Model Railroad Club and NMRA DCC presentations are at: http://www.siliconvalleylines.com/index.html - http://www.siliconvalleylines.com/index.html
Synspunkter???
------------- Morten W
H0 USA - Conrail, CSX & NS i Appalachia 1990+ O USA - Lehigh Valley ca 1975 Inspirasjon: Chubb, McClelland, T Koester, www.ldsig.org & www.opsig.org Besøk www.onorway.com
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