Quote:
Originally Posted by Pdelcast
I don't suggest the "no spark" resistor for the MMM -- for a few reasons. First, the resistors that are suggested are WAY too big. They can cause the beeps (during startup) to cause a boost (with the motor inductance) that creates voltage spikes -- without the battery there to absorb them. -- So if you plug in through the resistor, the caps charge fully, then the ESC beeps the motor -- can cause enough of a "boost" spike to damage some of the more voltage sensitive parts.
Even just the brake turning on (which happens on power-up for safety reasons) can also cause a "boost" spike --
So to be safe, just say no to the resistor. 
Really, it's easy on the caps to charge fast -- they don't mind at all.  It is hard on the connectors -- but connectors are cheap compared to ESCs...  |
Thanks for the clarification. The resistors were sized so that the user doesn't have to sit there for a minute waiting for the caps to charge. But what you say makes sense. I wouldn't think this would cause a hard failure though - go figure. I'll post a note on my page advising against the mod on the MMM. Any other ESCs where this is a no-no?
And yes, the intent was to save the connectors from pitting caused by the initial arcing.