I didn't belabor all the specific insights I have to this problem. It may be "tilting at windmills" as you say. May question, as poorly expressed as it may have been, is, can anyone "show" me, mathematically, that is inconsequential? What are the implications? To use an extreme example, at some...
davidbeach: yes, the unloaders have been checked and even forced to unload.
dcp: "One thing is pretty certain to me - increased contact resistance cannot cause an HMCP to trip."
Not even on phase unbalance? I^2 * R through the contacts alone are on the order of 13x. Assuming approx 2100 amp...
The breaker has been replaced recently. I don't want to raise the setpoint until I've investigated this other issue further. I suspect it is a contributing factor. Thanks for the quick response
Looking for a little assistance / experience with determining the impact of motor starter contact resistance. Given a 150 HP 3 PH induction motor used in an air compressor application. I don't have my notes with me right now, I believe FLA ~ 163. Continued issue of tripping the breaker at start...
