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Lenz ABC Technology

Together with Lenz Silver and Gold decoders, the new ABC (Automatic Braking Control) technology allows simple automatic control of locos. With little effort, ABC accomplishes just what model railway enthusiasts crave: precise on-the- spot stopping in front of signals and passage in the opposite direction. Presently, ABC offers three braking modules:

  • BM1 facilitates stopping in front of signals
  • BM2 facilitates stopping and braking in front of signals
  • BM3 facilitates assembly of automatic block sections.

ABC modules serve to influence track sections in front of signals. Direction dependent information on the signal status is fed to the locomotive decoder.

What else is ABC capable of?

While the locomotive is located in the asymmetrical voltage section,

  • all functions can still be switched
  • you can reverse away again from the signal
  • programming in operational mode (PoM) is possible as is
  • shunting and driving over sectioning points.

"On the right means on the right..."

...was a slogan on a german Autobahn sign at the end of the 1980s. It was meant to remind drivers to change back to the right lane after overtaking a lorry. The same is true when using the BM modules: "on the right means on the right".

It is always the right rail in the direction of travel where a rail-break is made when a driving or braking section is defined. Make breaks in the right rail at the beginning and at the end of the braking section. Alternatively, you can use an insulating track connector if there is a track joint at the point in question.

To use the ABC technology with BM1, BM2 and BM3 block section modules, you will need locomotive decoders of the Gold / Silver series or other decoders that support the ABC technology as well as suitable amplifiers that produce a clean DCC signal (LZV100, LV101, LV102)

Link to more info and films about ABC


Lenz 22600 BM1 ABC Brake module
LENZ22600Lenz 22600 BM1 ABC Brake module

Lenz 22600 Brake module BM1.

English Manual

The track voltage to the track section in front of the signal is directed via the BM1. If the signal is at 'Stop', the BM1 generates an asymmetry in the otherwise symmetrical, digital voltage. This is detected by Gold and Silver decoders as well as the new 10231-02 Standard. The result is a gentle braking of the train until it comes to a halt, optionally with the set braking delay or distance.

If a train approaches from the opposite direction, it simply continues as the detection of the asymmetry is direction-dependent (i. e. the decoder detects, depending on the direction of travel, whether the asymmetry makes the digital voltage more 'positive' or 'negative'). If the signal changes to 'Clear', the BM1 is bridged by the signal switch and the train accelerates at the speed set in the decoder.

Lenz 22610 BM2 ABC Brake module
LENZ22610Lenz 22610 BM2 ABC Brake module

Lenz 22610 Brake module BM2 

English Manual

The BM2 module uses ABC braking to stop trains in front of a signal. When the signal is green the train will drive through.  When the signal is red the train will slow to a stop based on its decoder inertia settings.  You can also wire in a slow approach function - if the signal shows an amber caution then the train will slow down to a speed set in the decoder until it leaves the section and picks up speed.

All current Lenz decoders support ABC Braking and Slow approach.  ESU LokPilot V4.0 and LokSound V4.0 now have ABC Braking and Slow approach (Caution: Older ESU do not have ABC Braking).  New Zimo Decoders also support ABC Braking. Zimo decoders do not support slow approach function.

Lenz 22620 BM3 ABC Brake module
LENZ22620Lenz 22620 BM3 ABC Brake module

Lenz 22620 Brake module BM3 

English Manual

The BM3 is a BM2 module equipped with a block-section function that allows lifelike block-section operation. The number of blocks is unlimited as each block requires a separate BM3 module. The BM3 has 2 outputs to connect light signals.

A BMA adapter is required to control double-coil drives (or motors).


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