agentskj Posted November 5, 2009 Share Posted November 5, 2009 I am looking to possibly get and item and it is fitted with a BACK EMF DECODER can any one advise how good or not so good these are Reference info it is a class 20 by Bachmann Sam thank you in advance Link to post Share on other sites More sharing options...
Piemanlarger Posted November 5, 2009 Share Posted November 5, 2009 I am looking to possibly get and item and it is fitted with a BACK EMF DECODER can any one advise how good or not so good these are Reference info it is a class 20 by Bachmann Sam thank you in advance is it fitted with the Bachmann decoder? from where are you buying? Ask to see it working.? Back emf is fine however. Link to post Share on other sites More sharing options...
deltic79 Posted November 5, 2009 Share Posted November 5, 2009 One thing to consider is that the Bachmann decoders with back emf do not support CV19 (i.e. advanced consisting) - assuming its the 36-553 or 36-554 ex-ESU decoder that's factory fitted, though I don't know of any other Bachmann decoder with back emf. This may not be important to you as you can still use Universal consisting, but then again it might be, particularly as its fitted to a 20 which were usually joined at the nose to a class mate. Just a thought. Rob Link to post Share on other sites More sharing options...
agentskj Posted November 8, 2009 Author Share Posted November 8, 2009 Chears people for your help so far i am learning slowly Could some one explain to me what BACK EMF means and does Thank you Sam Link to post Share on other sites More sharing options...
smokebox Posted November 8, 2009 Share Posted November 8, 2009 Chears people for your help so far i am learning slowly Could some one explain to me what BACK EMF means and does Thank you Sam Back emf or BEMF means Back Electro Motive Force. BEMF is produced when an electric current flows through a motor. As the motor turns it produces a back emf (due to the magnetic fields) that opposes the flow of the applied voltage. In relation to a model fitted with a decoder that uses BEMF, the effect is used by the decoder to calculate the load on the motor. If the model is pulling a heavy train or climbing a gradient the decoder senses this and applies more power to the motor in an attempt to maintain speed. If the train is lightly loaded or going down a gradient the decoder reduces power. So basically, within limits, BEMF is used to give a constant speed. Link to post Share on other sites More sharing options...
agentskj Posted November 8, 2009 Author Share Posted November 8, 2009 Back emf or BEMF means Back Electro Motive Force. BEMF is produced when an electric current flows through a motor. As the motor turns it produces a back emf (due to the magnetic fields) that opposes the flow of the applied voltage. In relation to a model fitted with a decoder that uses BEMF, the effect is used by the decoder to calculate the load on the motor. If the model is pulling a heavy train or climbing a gradient the decoder senses this and applies more power to the motor in an attempt to maintain speed. If the train is lightly loaded or going down a gradient the decoder reduces power. So basically, within limits, BEMF is used to give a constant speed. Thank you for the help smoke box - this is very helpfull Sam Link to post Share on other sites More sharing options...
Ron Ron Ron Posted November 8, 2009 Share Posted November 8, 2009 ....assuming its the 36-553 or 36-554 ex-ESU decoder that's factory fitted, though I don't know of any other Bachmann decoder with back emf..... Rob, slightly pedantic I know , but there is another Bachmann decoder with BEMF. It's the new 6-pin 36-558 (made for Bachmann by Soundtraxx). Obviously not the decoder in question though. . Link to post Share on other sites More sharing options...
deltic79 Posted November 8, 2009 Share Posted November 8, 2009 Rob, slightly pedantic I know? ? , but there is another Bachmann decoder with BEMF. It's the new 6-pin 36-558 (made for Bachmann by Soundtraxx). Obviously not the decoder in question though.? ? . Good point, I hadn't considered those as I thought that the 6 pin chip is generally an N gauge chip, and the OP is looking at a OO class 20. Certainly worth mentioning though for completeness? :icon_thumbsup2: Link to post Share on other sites More sharing options...
agentskj Posted November 9, 2009 Author Share Posted November 9, 2009 Just a small update i have brought the loco - i need another a clas 20's often run in pairs so i think xmas is beckoning Thank you for all your help it helped me make a decision Sam Link to post Share on other sites More sharing options...
craigwelsh Posted November 12, 2009 Share Posted November 12, 2009 If you find these locos have Bachmann decoders in then make sure you note the following as most systems use advanced consisting now. One thing to consider is that the Bachmann decoders with back emf do not support CV19 (i.e. advanced consisting) - assuming its the 36-553 or 36-554 ex-ESU decoder that's factory fitted, though I don't know of any other Bachmann decoder with back emf. Rob Link to post Share on other sites More sharing options...
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