I installed a 1204 on my e12m with an e20 motor. Kept all the existing relays for reversing. Put a reostat in series with the field with a latching relay that drops out every time I stop or reverse. This ensures I start with full field and torque. Has worked great for 8 years. Next step will be something with regen braking. Sent from Yahoo! Mail on Android |
| Interesting.... I had gotten as far as confirming that both the original Alltrax design (AXE) and their newer design (SPM) are rated for series and PM usage. (SPM = Series, Permanent Magnet). In turn I was wondering what Curtis did differently, but you have found that at least on certain models they share the same series and PM usage, eliminating that concern. Back when I drove a converted pickup truck with 9" series-wound motor and Curtis controller (1221C?), there was an issue where if coasted backwards and built up a little speed, there would be a sudden lurch. As I understood it, there was enough residual magnetism in the motor for it to generate a little power and as it reached the 0.6 volts of the freewheel diodes they would start conducting and give a little burst of braking. Learned not to do that as feared it was stressing the diodes (even so the Curtis eventually died and I went to a DCP controller). Thinking out loud now if either a controller (series/PM controller or a sep-ex) on an Elec-Trak would have such issues? > Curtis 1204 states that it CAN be used with series or PM > motors. It says to just omit using that A2 terminal if using a PM motor. > > ... the Alltrax drop in replacement for the curtis 1204, the NPX > and AXE series say in bold underline that they can be used on series and > PM motors. > _______________________________________________ Elec-trak mailing list Elec-trak cosmos phy tufts edu https://cosmos.phy.tufts.edu/mailman/listinfo.cgi/elec-trak |