Godders Posted January 16, 2014 Share Posted January 16, 2014 Recently a friend of mine had problems with an Atlas loco. The loco would run for a few minutes then stop. After a short while it would resume running then stop again. He read that the decoder manufacturer had advised someone else, with a similar problem, to place an inductor in the motor output of the decoder. My friend has subsequently done this and claims that it has cured his problem. My thoughts were that he had resoldered a bad joint. I make a point of removing inductors and capacitors when I fit a decoder. This usually cures problems. I can see no advantage and wondered if anyone else had come across this. . Thoughts anyone Cheers Godders Link to post Share on other sites More sharing options...
Gordon H Posted January 17, 2014 Share Posted January 17, 2014 If the decoder still sees a capacitive load on its output, an additional in-line inductor can help to decouple the effect. I have seen this issue arise in another application where for EMC reasons a DC motor had to have a capacitor fitted locally to the brushes. In spite of the inductance of the motor itself, the PWM motor driver device saw the combined circuit as a capacitive load and tended to shut down its output due to instantaneous overload detection at the pulse edges. The cure was an additional inductor back at the PWM driver outputs. Link to post Share on other sites More sharing options...
Godders Posted January 17, 2014 Author Share Posted January 17, 2014 Thank you for your reply but it assumes that there is an excessive capacitive load, in this instance there are no capacitors fitted so the load must be assumed inductive. Cheers Godders Link to post Share on other sites More sharing options...
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