richard carr
Western Thunderer
I run all my Heljan and now some of my JLTRT locos with one sound chip either a Loksound or the XL version some have 3.5s and others are version 4, it powers both motors wired in parallel. CV 56 was set to maximum on all the decoders I have on the version 4s this was based on their auto setup procedure. The JLTRT locos are powered by 2 ABC gearboxes with Maxon 6 watt motors
One thing I have noticed is that slow speed running is jerky, its definitely not smooth. So I have been playing around with the setups. After reading the loksound version 4 manual it became clear to me that either no back emf would be the solution or reduced back emf. This is achieved by altering CV 56, if you set it to zero then that turns off back emf altogether. I tried this, the loco runs smoothly but it often didn't even start to move until I had 30 showing on the controller, yet sometimes it started at 23. I know I can adjust the start voltage to remove some of this but I thought I would try a reduced back emf effect instead.
So I set CV 56 to 15 (the maximum is 64), this works great you still get some load control but its much much smoother at low speed. I then tried 20, 25 and 10, it was hard to tell much difference between them although 25 did seem to be a bit more jerky. So I have settled on 15 and all my locos are running much better than before. There is no difference between the Heljan motors and the maxon ones and no difference between any of the decoders.
I'd be interested to hear the results from anyone else if they try this.
Richard
One thing I have noticed is that slow speed running is jerky, its definitely not smooth. So I have been playing around with the setups. After reading the loksound version 4 manual it became clear to me that either no back emf would be the solution or reduced back emf. This is achieved by altering CV 56, if you set it to zero then that turns off back emf altogether. I tried this, the loco runs smoothly but it often didn't even start to move until I had 30 showing on the controller, yet sometimes it started at 23. I know I can adjust the start voltage to remove some of this but I thought I would try a reduced back emf effect instead.
So I set CV 56 to 15 (the maximum is 64), this works great you still get some load control but its much much smoother at low speed. I then tried 20, 25 and 10, it was hard to tell much difference between them although 25 did seem to be a bit more jerky. So I have settled on 15 and all my locos are running much better than before. There is no difference between the Heljan motors and the maxon ones and no difference between any of the decoders.
I'd be interested to hear the results from anyone else if they try this.
Richard