*** Actually the capacitors always have an effect, 100% of the time. They mask the back emf information from the motor and should be removed.
In reality, you just cannot see it as you trimmed CV2. A loco should crawl with CV2 set to 0 and no real changes to anything including back EMF if the communication between decoder and loco is right - and that means no caps.
Re your settings, neither CV2, 3 or 4 really have any effect on this relationship - they are simply running adjustments for start voltage and momentum.
ALL your improvement is due to CV53/4/5, and none of these would have been needed at all if the caps had simply been snipped.
Regards
Richard
QUOTE (BobB @ 7 Feb 2009, 15:36)
<{POST_SNAPBACK}>All my decoaders are Bachmann 3 function and they all worked well out of the box except the two fitted to Hornby locomotives. Settings relating to the motor controlthat needed changing were as follows :
CV2 Start voltage - set quite high, for me 5 was about right
CV3 Acceleration - low, down to 1
CV4 Retardation - low, down to 1
CV53 Feedback reference - set quite high, for me 50 seemed to work
CV54 Feedback parameter K, low, down to 12
CV55 Feedback parameter I, a bit high, for me 36
The hornby motors seem to have totally different characteristics to the Bachmann ones. I suppose it is only to be expected that Bachmann decoaders are set to suit Bachmann locomotives.
The above settings cured the eratic running. Removal of capacitors had no effect after getting the setting correct, I've now got one Hornby with and one without !
Hope this helps
Bob