[NSRCA-discussion] Help - Toasted ESC + Battery

[Jeff and Claire]

This is what puzzles me- Q80 is a 28 pole motor yet an ESC set for 28 poles doesn't work with it.  Must be other factors in the design to cause incompatibility and I guess have to accept that.  Will check the connectors too, thanks.  

-----Original Message-----
From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jon Lowe via NSRCA-discussion
Sent: Tuesday, July 15, 2014 10:14 AM
To: NSRCA
Subject: Re: [NSRCA-discussion] Help - Toasted ESC + Battery

>From everything I've heard and read, the Q80s don't like most escs except Jeti and Hacker/ Jeti escs.  I've been told they specifically don't work well with the OS esc's.  Sounds like ESC/motor incompatibility to me.

I've also burned up an ESC when one bullet connector came loose between the motor and ESC. Make sure any connectors there aren't burned.

On Jul 15, 2014 11:01 AM, Jeff and Claire via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
>
> Unexplained ESC problems happened two weeks in a row-  any ideas why? 
>
> Last week- motor shut off near end of flight as if ESC hit low voltage 
> cutoff.  Only the ESC would not reset. Resulted in off-field landing 
> and broken out landing gear.  Got to the plane and the ESC was doing 
> the slow beep (which I think is normal when it's been left on and Tx 
> is off) as opposed to the type of beep indicating it hit low voltage 
> cutoff. Battery pack still had 26% remaining, no low cells.  Hacker 
> Q80-11s, Castle HV80
> ICE2 (3 years old, unknown # flights), SkyLipo 4400
>
> So I repair the landing gear and install a new OS 1100HV ESC. 1st 
> flight everything seems fine. Early into the second flight there's a 
> loud screech during power-up after pulling from a vertical down line. Again, no power.
> (was not using brake, had not tried it yet).  Swung around to land and 
> opened the canopy to find new ESC burnt to a crisp and battery toasted too.
> This time Hobby People 4500's, a month old with 15 cycles.  Checked 
> balance connectors to find one 5s had one cell left, the other had 2 cells left.
> Blobs of solder fell out as I removed pack from plane.  Not sure, but 
> maybe these came from the soldered connections inside the pack. Can 
> see a blob still stuck inside.
>
> Checked motor using same Castle ESC from last week, and it seems to 
> run fine.
>
> Can what appears to be an operating motor cause an ESC to burn up? Can 
> a lipo pack cause an ESC to burn up?
> Or did the ESC just fail and take the battery with it?
>
> Any ideas why this happened or how to avoid in future? Ok, all but the 
> ones about switching to YS!  :) Jeff Worsham
>
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