Hello Markliners,

Does anyone have any feedback on infrared sensor made by Busch, item #5720 (or #5962) ? https://www.busch-model.info/000005720.4

I've found a wiring diagram at LDT http://www.ldt-infocente...sbeispiele/page_1936.pdf , and I'm very tempted to use some, essentially when doing changes that were not in the layout plan...

Any advice is welcome.

Cheers
Fabrice

Hi Fabrice,

I have been using Azatrax sensors for years with good success and very affordable. As reliable as contact tracks.

http://www.azatrax.com/i...odel-train-detector.html

Best Regards
Lasse

Hello Friends,

Here is the feedback of the Busch Infrared sensors (5720 and 5962): It works absolutely fine !

Except I had some trouble at the beginning of the setup:
-The first emitter / receiver didn't work at all ???
-After many tries, I used a lamp directed to the receiver, and miracle, the sensor on Rocrail was lit
-My first conclusion, was probably the emitter was defective or the IR beam was too small
-As I have also the bigger sensors (5962) available, I installed a pair of them to replace the small sensors... and exactly same result, nothing !
-And finally, I decided to swap the 2 wires connected to the emitter... and guess what: it works !
-Then I reinserted the small pair of IR sensors, swapped the power on the emitter, and it worked like a charm

Just a few minutes ago, I've found the explanation:
-the 16V AC power coming from the big accessory transfo is connected to 4 Viessmann rectifiers 5215, at various places of the layout. Each rectifier provides around 22V DC
-many Viessman LED lights are already connected to the rectifier, and correctly wired and never had trouble and respecting the color code (Yellow and brown INPUT become respectively green(+) and white(-) OUTPUT - my own color code)
-except when reading (again) the 5215 doc, it is clearly stated that the green and white have the polarity inverted, i.e. the + is white and - is green... Final explanation !

As a result, the schema provided by LDT is correct regarding the emitter (and of course the receiver connected to a RM88).
I've put a 1K resistor on the emitter, and no issue.

End of the story !

3 pictures:

First small set of 5720 IR sensors. They stay on the layout with a bit of yellow glue pad


2nd set of sensors, with same trick


Overview of the new siding track connected to the TT.

Now I plan to add a motorized water crane Viessman 5132 besides this track. That will be a bit difficult to drill because there are many wires below...
Follow-up with water crane in the Trossingen III thread, I hope before the end of month

Cheers
Fabrice

Hello Michael,

Look at post #1 and pick the wiring diagram from LDT, it is correct.
I think you can substitute the LDT-RM88 by a Marklin 60881. Plug the green wire of the receiver in the "T" input, and the other wire in any input 1 to 16.

About the resistor computation for the emitter, the specs from Busch are IMAX=20ma, and Voltage drop = 2.3V.
Thus, the formula to compute the resistor value is R=(Your DC Voltage - 2.3)/0.02 . Pick the fist normalized value ABOVE resistor value computed.
Example: if your DC voltage is 12 V, then the resistor value is (12-2.3)/0.02 = 485 Ohms. The next normalized value is 560 Ohms, so pick this one .

Last word: in the LDT doc, it is stated that the occupancy report is inverted, i.e. the sensor is ON when nothing crosses the beam. You'll have to manage it with your software (most of them allow you to invert the signal). If you don't use a dedicated software like Rocrail, Railroad&Co or Itrain or any other, I don't know if the CS2/CS3 is able to trigger an event on the descending flank of the signal (something crosses the beam) ?

Cheers
Fabrice