[NSRCA-discussion] E-deadstick, trouble-shooting.

Thu Jun 9 07:15:55 AKDT 2011

I'm no expert, but yes, that is my guess. The faster the FETS turn on/off, the more efficient and the less heat, but really fast switching times cause all sorts of EMI so the designers usually slow down the switching to mitigate this. During the switching interval, the higher the voltage, the more loss (heat). At least that is how I understand it. So it does not surprise me that it gets hotter with a higher voltage.

Bob R.

--- On Thu, 6/9/11, colin chariandy <cchariandy at yahoo.ca> wrote:

From: colin chariandy <cchariandy at yahoo.ca>
Subject: Re: [NSRCA-discussion] E-deadstick, trouble-shooting.
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Thursday, June 9, 2011, 10:41 AM

The losses(heat) is not only dependent on current (I2R) but also Mosfet switching losses. V(in) is a factor in the equations.

Colin

From: Keith Hoard <khoard at gmail.com>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Thu, June 9, 2011 9:53:21 AM
Subject: Re: [NSRCA-discussion] E-deadstick, trouble-shooting.

FWIW - I have the CC Ice HV 80 in an Integral, and the data logger
typically shows the temp rising to around 140-150F (60-80 amp draw)
and hovering there for the entire flight.  Castle tech support says
that their controllers don't start throttling back the juice until the
internal temp reaches over 200F.

What I find interesting is that I have the same controller on my
Osiris (5S pack vs. 10S pack) pulling the same 80 amps, but the
controller temp only rises to about 90F on the Osiris.

I haven't downloaded the data from Andersonville, but I didn't see any
power loss all weekend.  I'm sure that if the system was going to
overtemp, it would have happened this last weekend.

Keith Hoard
Collierville, TN
khoard at gmail.com

On Thu, Jun 9, 2011 at 8:36 AM, colin chariandy <cchariandy at yahoo.ca> wrote:
> Got it....I'll add a path for air around the controller.
>
> Thanks
> Colin.
>
> ________________________________
> From: Verne Koester <verne at twmi.rr.com>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Thu, June 9, 2011 9:32:20 AM
> Subject: Re: [NSRCA-discussion] E-deadstick, trouble-shooting.
>
> Yes. My controller is mounted immediately behind the motor and in front of
> the batteries. Air coming in the chin cowl flows over the controller and
> batteries and then goes back out the exit which is two, 7” X 1” exit holes
> in the bottom of the fuse right behind the wing tube. I also have two small
> openings in my cheek cowls that are hopefully feeding the fan in the motor.
> Some of the air from those is probably hitting the controller and batteries
> as well.
>
>
>
> Verne Koester
>
>
>
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of colin
> chariandy
> Sent: Thursday, June 09, 2011 12:28 AM
> To: General pattern discussion
> Subject: Re: [NSRCA-discussion] E-deadstick, trouble-shooting.
>
>
>
> Mississauga, Ontario.....beat a record high since the 50's.
>
>
>
> Do you guys allow some air to flow from the chin, around the speed
> controller area back into the fuse?
>
>
>
> Colin
>
>
>
> ________________________________
>
> From: Ron Van Putte <vanputte at cox.net>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Wed, June 8, 2011 11:43:00 PM
> Subject: Re: [NSRCA-discussion] E-deadstick, trouble-shooting.
>
> Wow!  34C converts to 93.2F.  What part of Canada was this in?
>
> I agree with Keith.  I run my Jeti 90 on standoffs, using the three mounting
> holes.  Never had a problem, even at Andersonville, GA last weekend, where
> the temperatures were in the upper 90sF.
>
> Ron Van Putte
>
> On Jun 8, 2011, at 10:32 PM, Keith Hoard wrote:
>
>> Sounds like ESC shut down for heat.  Does the Jeti have data logging?
>>
>>
>>
>> Keith Hoard
>> Collierville, TN
>>
>> On Jun 8, 2011, at 21:57, colin chariandy <cchariandy at yahoo.ca> wrote:
>>
>>> Hey guys...I was out practicing tonight when the motor lost all power in
>>> the first upline of the M. Landed the plane deadstick and could find nothing
>>> diconnected so I thought the battery was somehow open circuit. Plugged in
>>> another batt and the controller armed and ran the motor normally.
>>> Re-installed the previous batt and again all was OK.  I flew the plane on
>>> the same battery the failure occured with and there were no re-occurences
>>> but I was way too uncomfortable to really concentrate.
>>>
>>> It was 34C when I took off....the hottest I have ever flown that plane
>>> and I did have the controller velcroed in place in the chin with foam under
>>> it to prevent movement....not the coolest set-up.
>>>
>>> The plane is a Xigris, motor is the 30-10 evo and a Jeti 90 speed
>>> controller, JR Rx.
>>>
>>> Any trouble shooting advice? Do the Jetis have a thermal shut down?
>>>
>>> I did change the speed controller mounting to use the three screws
>>> instead of velcro.
>>>
>>> Colin
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> NSRCA-discussion mailing list
>>> NSRCA-discussion at lists.nsrca.org
>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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