[NSRCA-discussion] Mezon 90 Lite investigation

[Matt Griffitt]

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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