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Dimming

Each function output is set to 'full power' by default. This is not always the desired function: Lamps can be too bright, engines can turn too fast

A dim factor can be set in these cases, separately for each function output. (For the electricians: a duty cycle is set.)

Dimming is supported by all Qdecoder of the standard and all-in-one classes.

Each function output can be dimmed separately with a configuration variables. The values of the CVs can range from  1 (equals 1% duty cycle) to 100 (equals 100% duty cycle). This will result in an average voltage of the function outputs that is smaller than the supply.

dimm_kennlinie

The connected consumer loads will still get the full voltage, just not all the time. The above curve shows the time-averaged voltage. Depending on the connected element, the following is expected:

  • Lamps light darker. The brightness corresponds approximately to the curve. However, they should be able to withstand the full voltage. Otherwise, the lifespan is expected to shorten. If you are not troubled by this, you can operate a 5 V lamps with 25% dim factor at 20 V supply. This often works quite long...
  • LED lights can not be dimmed linearly unfortunately. For this it must be tested which dim factor corresponds to which brightness.
  • Engines turn slower proportionally.

The configuration variables (CV) define the dim factor as follows:

CV address

CV value at delivery

Description

112

100

122

100

132

100

100

242

100

252

100

262

100

 

 

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