Cor, Paul, thanks for the replies! I forgot about the freeewheeling diode(s).
So I'll connect it the way the manual says. Still ... I recall some discussion years ago about fixed frequency 15kHz+ Curtis controllers having trouble with current limiting on large, low inductance motors. It caused the combination to have jerky starts, or worse. The way Lee Hart explained it was that the low resistance meant that the current didn't have time to decay enough when the chopping transistors were off (because it was a very short time), so the current just kept rising insead of being properly limited. If that were the crucial factor here, I would think that extra resistance in the motor loop would HELP. But obviously not, because we're always advised to keep the motor leads as short as possible. I hate to sound dense (even though I am), but while I can understand that connecting the motor lead at the contactor (or other point ahead of the controller common terminal) could change the way the controller "sees" the motor, I still don't fully understand what specific problems that might cause. Maybe the earlier discussion about motor loop impedance / resistance isn't relevant here? Thanks again! David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
