<html><head></head><body><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"></div><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
</div><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;" dir="ltr" data-setdir="false">FYI: There's a nice article in the July K-Factor that covers redundant power systems. It discusses isolating power sources, etc... </div><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;" dir="ltr" data-setdir="false"><br></div><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;" dir="ltr" data-setdir="false"><br></div><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><br></div><div class="ydp781e8d8byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
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On Tuesday, August 20, 2019, 02:33:56 PM PDT, Peter Vogel via NSRCA-discussion <nsrca-discussion@lists.nsrca.org> wrote:
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<div><div id="ydp31ab0f2dyiv1457985102"><div><div dir="ltr">I misread the issue on my phone. Indeed, it is very bad (even during flight) for the BEC to get back-fed power from a backup battery, that's what diodes are for and the DSM ESC has such a diode in place.</div><br clear="none"><div class="ydp31ab0f2dyiv1457985102gmail_quote"><div class="ydp31ab0f2dyiv1457985102yqt5146511781" id="ydp31ab0f2dyiv1457985102yqt16990"><div class="ydp31ab0f2dyiv1457985102gmail_attr" dir="ltr">On Tue, Aug 20, 2019 at 6:07 AM Andrew Jesky via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" rel="nofollow" shape="rect">nsrca-discussion@lists.nsrca.org</a>> wrote:<br clear="none"></div><blockquote class="ydp31ab0f2dyiv1457985102gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex;"><div>The issue I’ve found is if you leave the battery backup on it keeps power to the capacitors in the mezon so the second you plug in your 42v source there is no buffer in the esc and this will happen. <div>You’ll see by disconnecting your main flight pack, leave the backup on and move the throttle stick. The motor will turn over just a little until all the energy is gone. </div><div><br clear="none"></div><div>What I’ve found is that always disconnect the backup when you unplug the main pack or have the esc arm and need to re plug in.This is critical if your doing any amperage checks. <br clear="none"><br clear="none"><br clear="none">Andrew <br clear="none"><div id="ydp31ab0f2dyiv1457985102gmail-m_-5628151616938399188AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br clear="none">On Aug 20, 2019, at 6:56 AM, Daniel Underkofler via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" rel="nofollow" shape="rect">nsrca-discussion@lists.nsrca.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Matt, I'm of the opinion that his regulator in line with the backup rx battery would protect him (essentially acting like a diode).<div>Admittedly, I've only used smart-fly regulators in this application.</div><div>Dan</div></div><br clear="none"><div class="ydp31ab0f2dyiv1457985102gmail_quote"><div class="ydp31ab0f2dyiv1457985102gmail_attr" dir="ltr">On Tue, Aug 20, 2019 at 4:38 AM Matt Griffitt via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" rel="nofollow" shape="rect">nsrca-discussion@lists.nsrca.org</a>> wrote:<br clear="none"></div><blockquote class="ydp31ab0f2dyiv1457985102gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex;"><div>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.<div><br clear="none"><div><a href="https://www.graupnerusa.com" target="_blank" rel="nofollow" shape="rect">https://www.graupnerusa.com</a>. </div><div>like I said , I am not aware of any other ESC with BEC that can take voltage both directions . I hope this helps.<br clear="none"><br clear="none"><div>Matt Griffitt <br clear="none"><a href="http://ADGaero.com" target="_blank" rel="nofollow" shape="rect">ADGaero.com</a><br clear="none">334.380.8228</div></div></div></div><br clear="none"><div class="ydp31ab0f2dyiv1457985102gmail_quote"><div class="ydp31ab0f2dyiv1457985102gmail_attr" dir="ltr">On Mon, Aug 19, 2019, 10:52 PM Xavier Mouraux via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" rel="nofollow" shape="rect">nsrca-discussion@lists.nsrca.org</a>> wrote:<br clear="none"></div><blockquote class="ydp31ab0f2dyiv1457985102gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex;"><div><div class="ydp31ab0f2dyiv1457985102gmail-m_-5628151616938399188gmail-m_-6325255702759523909m_-132138237659919191yahoo-style-wrap" style="font-family:verdana, helvetica, sans-serif;font-size:16px;"><div dir="ltr">Hi,</div><div dir="ltr"><br clear="none"></div><div dir="ltr">I have 2 planes with that ECS. The primary has 300 flights, the backup had 100 flights since the installation of that ESC.</div><div dir="ltr">Both planes use the BEC at 6.2V and a backup 2S lipo with a radio south regulator at 5.7V.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">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.</div><div dir="ltr"><br clear="none"></div><div dir="ltr">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.</div><div dir="ltr"><br clear="none"></div><div dir="ltr">I usually turn the backup battery ON first to check the voltage to the receiver and then the BEC.<br clear="none"></div><div><br clear="none"></div><div dir="ltr"><span></span>See pictures in that album:<a href="https://photos.app.goo.gl/gaN4bqG9BCgDyUzt8" target="_blank" rel="nofollow" shape="rect"> </a><a href="https://photos.app.goo.gl/gaN4bqG9BCgDyUzt8" target="_blank" rel="nofollow" shape="rect">https://photos.app.goo.gl/gaN4bqG9BCgDyUzt8</a></div><div dir="ltr"><br clear="none"></div><div dir="ltr"><div><div dir="ltr"><span>Since I have the same ECS on the other plane, I want to understand what caused it and if I did something wrong.</span></div></div><div><br clear="none"></div><div dir="ltr">Abt idea what happened ?<br clear="none"></div><div><br clear="none"></div><div>Could it be repaired or is it done ?</div></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Thanks you</div><div dir="ltr"><br clear="none"></div><div dir="ltr">Xavier<br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div></div></div>_______________________________________________<br clear="none">
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</div></blockquote><blockquote type="cite"><div dir="ltr"><span>_______________________________________________</span><br clear="none"><span>NSRCA-discussion mailing list</span><br clear="none"><span><a href="mailto:NSRCA-discussion@lists.nsrca.org" target="_blank" rel="nofollow" shape="rect">NSRCA-discussion@lists.nsrca.org</a></span><br clear="none"><span><a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank" rel="nofollow" shape="rect">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></span></div></blockquote></div></div>_______________________________________________<br clear="none">
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