LENZ BM-1 - How compatible are they?

[noel]

+

....... BM1, BM2 and BM3 modules. Note that you don't need a Lenz DCC system to use this,
you just need the modules and a suitable decoder in the train.

Currently there are threads under "Electronics" making reference to the LENZ BM-1.

Questions -

What is a suitable decoder?

Does this require a decoder that works with feedback?

Will it work with an NCE driven Bus?

+

[Bigmet]

A suitable decoder is one that supports Automatic Braking Control (ABC) system using Lenz' assymetric DCC technique. This may be found on Lenz Gold and Silver decoders, and also on some Zimo decoders. It may well be available on other maker's decoders, for example I saw a reference to assymetric DCC capability for the Hornby Sapphire decoder; that would require a read of the specification to be sure. It isn't dependent on the command system other than that the output must be NMRA conforming DCC; this is essentially a hardware based system for stops, reverses, shuttle movements and the like.

[RAF96]

I can confirm that the Sapphire works with ADCC as invoked by the Lenz BM1 module, although being tight fisted I made my own with a bit of veroboard, 5 diodes and a dual terminal connector for convenience of connecting to the gapped rail (always the RH rail in direction of travel - ref Lenz data sheet.
My DIY version of BM1 has been posted on several forums many moons ago. Can't repost the plan yet as I am 2000 miles away from the pc with it on.
Rob

[noel]

+

Rob: Found your post on NRM in 2009.

The attachment is corrupted and will not show.

+

[RAF96]

+

Rob: Found your post on NRM in 2009.

The attachment is corrupted and will not show.

+

Noel
Please find DIY version of BM1 info here http://www.rmweb.co.uk/community/index. ... generator/
Rob

[Flashbang]

Hi
Below is the basic ABC braking system for DCC decoders with ABC enabled....



Note, the five diodes are wired into the right-hand rail when facing forward direction.

[noel]

+

What diode values, please?

Any solution for metal wheels traversing the "IRJ" gap?

+

[Flashbang]

Hi
Diodes can be any type of rectifier type such as 1N4001 or 1N4002 etc. Or you can use rapid / ultra fast recovery types if wished.

Metal wheels shouldn't make any difference. But all pick-up wheels of the loco to be slowed must in inside the section of track between the IRJs. Which of course needs to be of a reasonable length to allow the whole loco to enter then slow to a stop inside the section.