X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=PKtNwriC c=1 sm=1 tr=0 a=Mx5Mgh1sDFzWjldfcztQyQ==:117 a=3dcVPhaW9E5eZbArlZqxvQ==:17 a=2ur7OfE09M0A:10 a=cOgVp-52ANUA:10 a=4LEzQhuViXQA:10 a=r77TgQKjGQsHNAKrUKIA:9 a=pGLkceISAAAA:8 a=_6GpL_ENAAAA:8 a=W99k0aOZ0zyGoK-4fgMA:9 a=QEXdDO2ut3YA:10 a=4PR2P7QzAAAA:8 a=gsFNUrBNzl-xZA8u_D0A:9 a=KgmEiDV0yqkXxW4v:21 a=_W_S_7VecoQA:10 a=4dqwQCo7Po2mVW515mGf:22 From: "Finn Lassen finn.lassen@verizon.net" Received: from sonic305-4.consmr.mail.bf2.yahoo.com ([74.6.133.43] verified) by logan.com (CommuniGate Pro SMTP 6.2.10) with ESMTP id 11984629 for flyrotary@lancaironline.net; Mon, 10 Dec 2018 18:31:46 -0500 Received-SPF: neutral receiver=logan.com; client-ip=74.6.133.43; envelope-from=finn.lassen@verizon.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1544484673; bh=8vVbYM5mx7bP20Oei16/Kksr0tdJV9BkkKxN7CAwSBY=; h=Subject:To:References:From:Date:In-Reply-To:From:Subject; b=ExFlKhHWDEJA9suqMtmeFv0UALEdQcFvUiCIo/JKzyoxoYCxz5vnUCjaqlhQAWhW/OivAbWA3/F9WKv7hutIBi/48k0aUjJX9h+1cdNrfgn8SOic2M7e7aeWSGlllKnfRxnYTd++8e+Zefe71bptiJlt2wQO13egGj+wv9639VH5FNX/LSWaVl55cyLDbNPZ7goNSrda3VVJbsH28pjNH6lFYNH7YV/GA8CO5qe6mqSZB68vvYkaPQfwSEbQpEL0bnPj9+zB44y65oYurOS/GdNuoJhJGu1SHM4gOm1Ta+YRkYleXtQasA7fndzChU6LlQ+6dvM0T9+R5DRHzqbD/w== X-YMail-OSG: avoJZdEVM1lVYmv3Mm8iZpmudp3NY3c8t7wPAP9YTCkhhPxNTVIrjglGs7Zw16F yscyWbpS5wKuFVTwFyP5A4K_269vPTot4byEA5G4aARBJ6DjwXk1P9gn2A.l2CSXzjtmpO6OvI_H DI1SRlDc4Zllu2.AeE0VIgzCdm6W5RlF8Tbt_3hUWyB6YsROyafviL_eFm9wDDYwsh9rwOXEh88P cE298WSMGpQ56l0klOHx54l2pwUU0XjA.610jLjqm.M97Qw0D7FBTEy4W1rIDY4M9_Nn_Z5r6RUU tMdEdkOgEFTg2uXQEDOQJCBwPATqzoy12yZ3gpR2A.h2FyDOeNtZSZ_TywLPcblsco3DzvJoewj1 Yi1tfh7awyfq.jnziaVF.EdRU3oOrO4qnt5JCMRzI.1uH6K.xj_PcVxaiByUFZdiIlvh5laaUXzi fjSMgkf2bstuITekTvDyBU1fUy5X8CGgPN0rHhHlgCIUH0X1beEadSp848FGYT0N9TINZ36U_QiA 38Q9dKJqnEqPyhvwuB6b9jov.JaO4FxhTHkQyYTipWQDYY3cS_upa9ZLl8iPxfcGh.1U40LF7XXm 47ItoK0b8JKWs0kiibSWg.JjQCgi1_ih7rpbj6BjfSMKjSWrHZn1ifCHlJbX6K81swCLJXV15tLi txSD2o7jbGYWUwzVaJaj7P82sNs_12qA3ejEZTCinEXGEhKKHIsMbauM8DrVn8fs.SenKK6_qQTB mHs3Bsr5f6Rt8eg4AlgkHfG0G_o1ol9ENqdn9Q8UHA_zmmIX.t.VABEVpbdQcFYAZH.QoqSaOw_2 B1DCFZa4RMUqcevBJr_LVGVFlzSokEBz2.AMTMm7S7OZrprDZEEa_N.om5d084rlGR_bHgrtU_CQ idupGFvpnC9O_QamYDWR0BD_RYgsiw5vd5hF6aAL8I6wRoa.0q00oxdoLynBhdAnE4sSdL58ptpz EDClcE86MznNy4Soqr.p60rImUt5X3ILoPU7jQPNnbtOlYvVLAvZDnN566ChL7VuMxLx2LeooT0r 0QkpLPYWix4chUv5fOdHu4BK50mbVbqc6kZd1oRm_2T.p.wDi Received: from sonic.gate.mail.ne1.yahoo.com by sonic305.consmr.mail.bf2.yahoo.com with HTTP; Mon, 10 Dec 2018 23:31:13 +0000 Received: from 60.sub-174-227-138.myvzw.com (EHLO [192.168.1.3]) ([174.227.138.60]) by smtp407.mail.bf1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID d1c39d1471cb4439cc13f477bd7ef090 for ; Mon, 10 Dec 2018 23:31:11 +0000 (UTC) Subject: Re: [FlyRotary] avionics minefields.... To: Rotary motors in aircraft References: Message-ID: <32f1540f-5a2e-6b89-1723-a161b539bcf7@verizon.net> Date: Mon, 10 Dec 2018 18:31:07 -0500 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------DFB2436941914922C62FBD26" Content-Language: en-US This is a multi-part message in MIME format. --------------DFB2436941914922C62FBD26 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Floating grounds. On 12/10/2018 12:43 PM, Charlie England ceengland7@gmail.com wrote: > If any of you guys out there tend toward OCD and are currently wiring > your plane, here's a heads-up. > > I probably know too much (or maybe not enough) for my own good about > electrical stuff, including issues like electrical noise & ground > loops. So when I created the wiring harnesses for my RV-7 a couple of > years ago, I tried to make sure I avoided ground-related issues by > carefully routing grounds *exactly* where they should be according to > the avionics documentation, and making my best educated guess when I > couldn't find any good documentation. > > Well, I laid a couple of mines, & didn't step on them until I > installed the instruments to do a test powerup, prior to closing out > the fuselage. The intercom wouldn't power up, and neither would my > Anderson engine monitor. After spending a couple of days digging > through my extensive (but not very well done) notes, I found the > sources of my problems. > > The intercom has a 'floating' chassis, and you're directed to run the > ground wire to the radio. I did this; running the ground to the power > ground in the GNS430's tray. I also thought it would be smart to > ground the Anderson monitor to the main ground point in the EC-2, so I > tied it to pins 19 & 37, which are then grounded to the engine block. > (I documented the power connections well, but the ground side...not so > much.) > > So on my 1st real power-up test of the system, not wanting to put > multiple high dollar instruments at risk, I only powered or installed > a single instrument at a time. Anyone see the mines yet? > > Charlie > > > Virus-free. www.avast.com > > > --------------DFB2436941914922C62FBD26 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
Floating grounds.

On 12/10/2018 12:43 PM, Charlie England ceengland7@gmail.com wrote:
If any of you guys out there tend toward OCD and are currently wiring your plane, here's a heads-up.

I probably know too much (or maybe not enough) for my own good about electrical stuff, including issues like electrical noise & ground loops. So when I created the wiring harnesses for my RV-7 a couple of years ago, I tried to make sure I avoided ground-related issues by carefully routing grounds *exactly* where they should be according to the avionics documentation, and making my best educated guess when I couldn't find any good documentation. 

Well, I laid a couple of mines, & didn't step on them until I installed the instruments to do a test powerup, prior to closing out the fuselage. The intercom wouldn't power up, and neither would my Anderson engine monitor. After spending a couple of days digging through my extensive (but not very well done) notes, I found the sources of my problems. 

The intercom has a 'floating' chassis, and you're directed to run the ground wire to the radio. I did this; running the ground to the power ground in the GNS430's tray. I also thought it would be smart to ground the Anderson monitor to the main ground point in the EC-2, so I tied it to pins 19 & 37, which are then grounded to the engine block. (I documented the power connections well, but the ground side...not so much.)  

So on my 1st real power-up test of the system, not wanting to put multiple high dollar instruments at risk, I only powered or installed a single instrument at a time. Anyone see the mines yet?

Charlie

Virus-free. www.avast.com


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