Hornby 8249 Decoder doesn't switch off F1

[PatriotClass]

Hello,

 

I have fitted some of my locos with the Hornby 8249 Decoder and now want to upgrade them by installing a remote decoupler.

This device from Märklin works fine with the LENZ standard V2 on F1 (green wire).

Having connected the uncoupler to green and blue wire on the 8249, I was able to activate it on F1 key but can't  cut off power, although having deactivated F1 on the control.

I had to hit the emergency stop button to power down the main. After restoring power, the function out of the decoder was off. I could activate it hitting F1 but again was unable to turn it off.

 

I changed the decoder by a new one out of the box, but the problem appeared again.

Also with a LED hooked parallel to the dcoupler, the same effect.

 

Any ideas?

[smokebox]

How much current does the uncoupler use?  The R8249 can only supply 100mA maximum on each of the function outputs.

Edited October 6, 2019 by smokebox
Typos

[PatriotClass]

The uncoupler uses 250 mA. I thought the sum of all functional outputs should not exceed 500 mA.

Then drawing to much power makes the funktion output of the decoder stall?

 

[smokebox]

You can't exceed 100ma on any function output. 

 

 

Edited October 6, 2019 by smokebox
Incorrect information deleted

[PatriotClass]

Okay, thank you Smokebox!

 

Then I will replace the Hornby decoders by the LENZ Standard V2.

[tractor_37260]

1 hour ago, PatriotClass said:

Okay, thank you Smokebox!

 

Then I will replace the Hornby decoders by the LENZ Standard V2.

 

A much better choice..............

[RAF96]