On Sat, Nov 2, 2013 at 5:43 PM, David Nelson <[email protected]> wrote: > You might want to consider two contactors. One that engages first > through a starting resister and the second to short out the resistor > for full power. This will save the contacts in the contactor.
Thought about that (with the starter contactor and resister together in parallel with the main contactor) but it started to get complex, because I want to not energizing both coils during normal operation, as it seems like a waste when I want to eke out as much range as possible. My solution was that I'll probably eventually need to buy a new contactor, and I'll have an emergency disconnect (SB350 with pull handle installed, sitting next to the motor, and cabled to a pull ring on the console) in case the contactor fuses closed. Does anyone have a circuit designed that would take the starting contactor coil offline once the primary contactor is engaged? If so, I could re-evaluate that decision. But if I try to design it myself it won't work. I need to keep my circuits simple if I'm designing them! ☺ (I know that with a motor controller you really need precharge resistor due to capacitor inrush.) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
