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52 Posts
Hi Folks,
Would someone be able to give me a plain-english explanation of how the back-emf tuning CV's work?
I've managed some success, turning an undriveable old 47 in to something that's actually half decent however i'm down to one kind of behaviour that is common to it and two other locos. The decoders are all 36-553 Bachmann 3 function with Back-EMF / Load Compensation.
The effect is that if you have the trains running at whatever speed, then drop the speed to zero, they'll gently slow down and as they are about to stop they'll lurch and sputter momentarily, about a wagon length, before stopping. The amount of sputter depends on the speed, if you go from full speed to zero then you get about a wagon length, if you gently bring the speed down yourself it runs almost perfectly.
The controller is a Lenz Compact + LH30, though I have another loco (Bachmann 56xx) with the same decoder that does not exhibit this problem so i'm pretty sure it's just a matter of balancing the EMF parameters to the motor...
Unfortunately, reading many tutorials online i'm still befuddled as to how it works.
Any recommendations greatly appreciated
Matt.
Would someone be able to give me a plain-english explanation of how the back-emf tuning CV's work?
I've managed some success, turning an undriveable old 47 in to something that's actually half decent however i'm down to one kind of behaviour that is common to it and two other locos. The decoders are all 36-553 Bachmann 3 function with Back-EMF / Load Compensation.
The effect is that if you have the trains running at whatever speed, then drop the speed to zero, they'll gently slow down and as they are about to stop they'll lurch and sputter momentarily, about a wagon length, before stopping. The amount of sputter depends on the speed, if you go from full speed to zero then you get about a wagon length, if you gently bring the speed down yourself it runs almost perfectly.
The controller is a Lenz Compact + LH30, though I have another loco (Bachmann 56xx) with the same decoder that does not exhibit this problem so i'm pretty sure it's just a matter of balancing the EMF parameters to the motor...
Unfortunately, reading many tutorials online i'm still befuddled as to how it works.
Any recommendations greatly appreciated

Matt.