X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=L5hfeKb8 c=1 sm=1 tr=0 a=hsBYhBl6NrnEtEsl//QKUw==:117 a=x7bEGLp0ZPQA:10 a=xXDCcK6TKBsA:10 a=v2DPQv5-lfwA:10 a=eRLigfuSAAAA:8 a=Ia-xEzejAAAA:8 a=pGLkceISAAAA:8 a=1ZTdLwgr66c6hD7ySkMA:9 a=QEXdDO2ut3YA:10 a=adc_8H0a-VU9Q1OBZ5gA:9 a=D49bHjZcv2IP1byQ:21 a=BfhXYjFvZD4iae-mNffo:22 a=Urk15JJjZg1Xo0ryW_k8:22 From: "Todd Bartrim bartrim@gmail.com" Received: from mail-wm0-f50.google.com ([74.125.82.50] verified) by logan.com (CommuniGate Pro SMTP 6.2.2) with ESMTPS id 10880189 for flyrotary@lancaironline.net; Tue, 27 Mar 2018 23:04:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.50; envelope-from=bartrim@gmail.com Received: by mail-wm0-f50.google.com with SMTP id l16so2312706wmh.3 for ; Tue, 27 Mar 2018 20:04:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=jBrFFM300tCbRujy+dxgIZGZZc9yaN23dPjgXIYaDNM=; b=bLLIddJjWOQrpnWZ5T1u1Rh1HP7u2LOSpcST5AVvjiAMA3CjI5PCct/+o9TwS5auZn VaONr2DnWX8O5FQ7OWblkp9ZApsBz60gQjugesNbczqBQE6MZT3aCIIN3n04LhEX+b7Y eYmKoe37iO6re2b9zxzveLPAeWNtH+aFtGIBfnhH8rlIjLT6gh95YhYVVSDpKtXG5wUh YJLmi4JylFJqhSSff9qaUOHkfaPdll1/OS5uQ5fWZsz23ksnrRDJdk23KvdcOb/tZuZ4 ev2Kyl7U+k35sUAj/RFMtcmddRMRN/ud4846+M1612Qk9WYnFR1LIb/iV82DLe0fFG+U oINw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=jBrFFM300tCbRujy+dxgIZGZZc9yaN23dPjgXIYaDNM=; b=HKg0cOEk7n+II1IuwinaMcH1zBxdufgtd3JAP7uUn/YOaLZK0uc6sSPRcmbeLnzW+p RP0u7O7HYseB493MhiCg3BtfZsPi14CXspiP0nzWlzUkg8rDdzg5XO3KlvImNH2RvhuS 4q4s8sKlwsZG2uHI2tdHbDsowCcfWKlwnhVtz6Wgd5BrkKokXPuj5RHXZxI5t3qfpN/R aL9OVTPQRTM7vKD0hZdp5JciJ7H4GODK71iMuUHRVjNTGKIWvEdW3WniOjGsGfxZK16i 3dJbD01r+lSrqTK4im3SvgQWP+bHU4lHdDxUEeo3fpmtDxnADvOvKglD4XXoF8OaczRn LmYw== X-Gm-Message-State: AElRT7FKgxjYaeKfA7WSgefmHlzjOdmGB3DqfiMHxPlG2ypSh/gInJqq RXm5gxV4BRplzOkycFwsIGu+2n65d7Vu66f/cA== X-Google-Smtp-Source: AIpwx48z8ZSnWV3dxYORrwt/JZdLW/w77RhoHf74H3MHF/eqUwY/sUiVz7b1TJ7LeE9Gk/Q+4jDeUZrH3Sh6ELIJACs= X-Received: by 10.80.220.73 with SMTP id y9mr1496158edk.176.1522206270721; Tue, 27 Mar 2018 20:04:30 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.135.214 with HTTP; Tue, 27 Mar 2018 20:04:30 -0700 (PDT) In-Reply-To: References: Date: Tue, 27 Mar 2018 20:04:30 -0700 Message-ID: Subject: Re: [FlyRotary] Re: back-up power for EC2 To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="f403043e2e600a92c005687044da" --f403043e2e600a92c005687044da Content-Type: text/plain; charset="UTF-8" Hi Andrew; Are you suggesting that the EC2 has an internal diode bridge for this isolation function? I just checked and have 0.3 ohm between pins, indicating they are common internally. However I should mention my EC2 is an original model (serial #315) and I believe Tracy may have changed a few things in later versions. It has been updated but this is only for firmware and not hardware. Todd Bartrim On Tue, Mar 27, 2018 at 7:53 PM, Andrew Martin andrew@martinag.com.au < flyrotary@lancaironline.net> wrote: > Todd, a diode bridge in between allows 2 separate power feeds and keeps > them isolated. > Andrew > > On Wed, 28 Mar 2018 at 10:50 am, Andrew Martin > wrote: > >> >> On Wed, 28 Mar 2018 at 10:46 am, Todd Bartrim bartrim@gmail.com < >> flyrotary@lancaironline.net> wrote: >> >>> Has anyone provided redundant power sources for their EC2? >>> Currently I have power supplied via a circuit breaker, but I'm >>> considering adding another power supply wire fed with a fuse. >>> However they would both still feed through pins 33 & 34 which are >>> internally connected. So even if I was to separate these pins for there own >>> feed (they are currently fed from the same wire), a short on either one >>> would likely cause both the fuse and CB to blow. >>> I'm just trying to take care of a last few things on my list before >>> taking this plane up to the airport and something I'd added to the list >>> many years ago was redundant power for the EC2 since a failure of that >>> could really ruin my day. >>> Since the most likely point of failure (even though it's quite >>> unlikely) would be the DB37 pin connector on the EC2, I'm not sure that it >>> is worth the effort to open up the connector shell to add another power >>> wire. >>> I've changed my mind on this several times over the last while and now >>> I'm running low on time so I'd throw it out for the collective wisdom of >>> the group. >>> >>> Todd Bartrim (can't think of anything witty to sign off with) (I >>> still miss Rusty's witt, for those that remember him) >>> >>> C-FSTB >>> RV9 Turbo13B >>> >> -- > > -- > Regards Andrew Martin Martin Ag > --f403043e2e600a92c005687044da Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Andrew;
=C2=A0 Are you suggesting that the EC2 has = an internal diode bridge for this isolation function? I just checked and ha= ve 0.3 ohm between pins, indicating they are common internally. However I s= hould mention my EC2 is an original model (serial #315) and I believe Tracy= may have changed a few things in later versions. It has been updated but t= his is only for firmware and not hardware.
=C2=A0=C2=A0

Todd Bartrim

On Tue, Mar 27, 2018 at 7:53 PM, Andrew Mart= in andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:
Todd, a diode bridge in between al= lows 2 separate power feeds and keeps them isolated.
Andrew

On = Wed, 28 Mar 2018 at 10:50 am, Andrew Martin <andrew@martinag.com.au> wrote:
<= /div>

On Wed, 28 Mar 2018 at 10:46 am, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net= > wrote:
Has anyone provide= d redundant power sources for their EC2?
=C2=A0 Currently I have power = supplied via a circuit breaker, but I'm considering adding another powe= r supply wire fed with a fuse.
However they would both still feed= through pins 33 & 34 which are internally connected. So even if I was = to separate these pins for there own feed (they are currently fed from the = same wire), a short on either one would likely cause both the fuse and CB t= o blow.=C2=A0
=C2=A0 =C2=A0I'm just trying to take care of a = last few things on my list before taking this plane up to the airport and s= omething I'd added to the list many years ago was redundant power for t= he EC2 since a failure of that could really ruin my day.
=C2=A0 = =C2=A0 Since the most likely point of failure (even though it's quite u= nlikely) would be the DB37 pin connector on the EC2, I'm not sure that = it is worth the effort to open up the connector shell to add another power = wire.
=C2=A0 I've changed my mind on this several times over = the last while and now I'm running low on time so I'd throw it out = for the collective wisdom of the group.

Todd Bartrim=C2=A0 = =C2=A0 (can't think of anything witty to sign off with) (I still miss R= usty's witt, for those that remember him)

C-FS= TB
RV9 Turbo13B
--=C2=A0
--
Regards Andrew Martin Martin Ag

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