[NSRCA-discussion] Mezon 90 Lite investigation

[Daniel Underkofler]

Matt, I'm of the opinion that his regulator in line with the backup rx
battery would protect him (essentially acting like a diode).
Admittedly, I've only used smart-fly regulators in this application.
Dan

On Tue, Aug 20, 2019 at 4:38 AM Matt Griffitt via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:

> All of the ESC from jetti will have the same issue. You need to put a
> diode in line with the bec power supply and the RX. You can get away the
> diode if you always plug your flight pack in and arm the esc and then turn
> you 2s lipo pack on. As of right now the only esc that can take power in
> both directions is the Graupner HV line of ESC. They work great and are
> less money than the mezon.
>
> https://www.graupnerusa.com.
> like I said , I am not aware of any other ESC with BEC that can take
> voltage both directions . I hope this helps.
>
> Matt Griffitt
> ADGaero.com
> 334.380.8228
>
> On Mon, Aug 19, 2019, 10:52 PM Xavier Mouraux via NSRCA-discussion <
> nsrca-discussion at lists.nsrca.org> wrote:
>
>> Hi,
>>
>> I have 2 planes with that ECS. The primary has 300 flights, the backup
>> had 100 flights since the installation of that ESC.
>> Both planes use the BEC at 6.2V and a backup 2S lipo with a radio south
>> regulator at 5.7V.
>>
>> Getting ready for a 3rd flight on the backup yesterday, the ECS made
>> sparks and smoke when I connected the battery. I took the ECS apart and
>> found what I think is a FET busted.
>>
>> 2 observations: I accidentally left the backup battery and BEC switches
>> ON after the 2nd flight about 10 minutes before and only noticed it after I
>> connected the main battery. I may have touch the connectors twice in quick
>> successions when connecting the battery.
>>
>> I usually turn the backup battery ON first to check the voltage to the
>> receiver and then the BEC.
>>
>> See pictures in that album: <https://photos.app.goo.gl/gaN4bqG9BCgDyUzt8>
>> https://photos.app.goo.gl/gaN4bqG9BCgDyUzt8
>>
>> Since I have the same ECS on the other plane, I want to understand what
>> caused it and if I did something wrong.
>>
>> Abt idea what happened ?
>>
>> Could it be repaired or is it done ?
>>
>> Thanks you
>>
>> Xavier
>>
>>
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>
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