X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=L5hfeKb8 c=1 sm=1 tr=0 a=uiPjGrJLWPPS5B33z+TjKQ==:117 a=v2DPQv5-lfwA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=eRLigfuSAAAA:8 a=PN4RQEAMylMgni2exMMA:9 a=QEXdDO2ut3YA:10 a=adc_8H0a-VU9Q1OBZ5gA:9 a=4pfDS2kQDTG59gYp:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=BfhXYjFvZD4iae-mNffo:22 From: "Andrew Martin andrew@martinag.com.au" Received: from mail-qt0-f175.google.com ([209.85.216.175] verified) by logan.com (CommuniGate Pro SMTP 6.2.2) with ESMTPS id 10880205 for flyrotary@lancaironline.net; Tue, 27 Mar 2018 23:12:55 -0400 Received-SPF: none receiver=logan.com; client-ip=209.85.216.175; envelope-from=andrew@martinag.com.au Received: by mail-qt0-f175.google.com with SMTP id v11so1110442qtj.6 for ; Tue, 27 Mar 2018 20:12:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=martinag-com-au.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=ZVxpCGiHkA18Ox9BrUNzIOrIub8jqV70RX6Xa3J4Py0=; b=1HVybRGB9HxHomYKPYnZtywm7K9FxMHAuEL0YIUaG8lM0fHeqLuEXkHHa0q+xXS6VU q3Xg7M+MGGIc+1TweI6o1j2oXArfdHBLIpAjDH8/gYRtzlzyhHxSdaik7zukR7VWxZAn 7lt1lD5qB3QtdhPBG3X/aL5BaHBuh597y1NOW3DdiufOHHq1pOVYDDH16GeAQNA2ph5s ibiObP9E8rhrnpL6E2Akdn5cilkI+8gB+sza/vr2gXxeCzxSAaHDXQmmzc3LEbtoF4xu E7+rQRzqvcEOmewCJPyUCm42+sxcXbr+/cvxF39voOXs857hbnCol5as9H4rhgw3G994 mnqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=ZVxpCGiHkA18Ox9BrUNzIOrIub8jqV70RX6Xa3J4Py0=; b=uRQH+Ji5Q1AgzlMfiOfhswb++Db9W/JzlkzSjdE2akfedPihMg0aY26ecFw0zXAzo9 OejLcf0WYE/p+D9LuPG/Nr6bRyjbRX4FzGA5QjPzfBWlnthQ420UcmxByXeyrwbQskd8 IIN5Ko7V6RmznG2Oqeu1ibjmbiGiK7VfDklHUw83TY//D3+pv4CDTY6ytVwjM4xHNJqp 7FANPfvhovKWC19P6AKlkTZnKapIAaDO0JPnZv+rv6ksgVb2NCWymuiDqQecR6zfyYeG H1jZZilng4z8iO26Ro4uUqxgmYYPCmheUTDlMal9K5z6UqPnzIWtyfxHJEWedNjPyF1s QMRg== X-Gm-Message-State: AElRT7F22Tbz9fyPyz/t3bvUDZZVqG+rIPmPp+W4HNhh0vOvRv50twOz i+QfPANpJv1JN5bpLYf9bWVmXbL0Ub5Qqg6paYka X-Google-Smtp-Source: AIpwx48v86z1gy8lusl0NRR78PYREE8LYysXxsh+DoDoqINZnxphbBVbxH9M8dDtlo8qHOUNQO1AfXLNvRup4bCfL0U= X-Received: by 10.237.42.67 with SMTP id k3mr2924387qtf.24.1522206758635; Tue, 27 Mar 2018 20:12:38 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Wed, 28 Mar 2018 03:12:28 +0000 Message-ID: Subject: Re: [FlyRotary] Re: back-up power for EC2 To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="001a114192581f93560568706140" --001a114192581f93560568706140 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable No. Add one of those 4 post diodes externally. If I can find mine I=E2=80= =99ll post part number. But pretty sure they are about 25a capacity, you only use 3 of the pins, 2 in, 1 out. I think they are designed as rectifier, but are really good for putting 2 power supplies into 1 load. Andrew On Wed, 28 Mar 2018 at 11:04 am, Todd Bartrim bartrim@gmail.com < flyrotary@lancaironline.net> wrote: > 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 fe= w > things in later versions. It has been updated but this is only for firmwa= re > 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 ther= e own >>>> feed (they are currently fed from the same wire), a short on either on= e >>>> 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 lis= t >>>> 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 tha= t it >>>> is worth the effort to open up the connector shell to add another powe= r >>>> 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 wis= dom >>>> 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 >> > > -- Regards Andrew Martin Martin Ag --001a114192581f93560568706140 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
No. Add one of those 4 post diodes externally. If I = can find mine I=E2=80=99ll post part number. But pretty sure they are about= 25a capacity, you only use 3 of the pins, 2 in, 1 out. I think they are de= signed as rectifier, but are really good for putting 2 power supplies into = 1 load.
Andrew

<= div>On Wed, 28 Mar 2018 at 11:04 am, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
Hi Andrew;
=C2=A0 Are you suggesting that the EC= 2 has an internal diode bridge for this isolation function? I just checked = and have 0.3 ohm between pins, indicating they are common internally. Howev= er 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.
=C2=A0=C2=A0

Todd Bartrim

On Tue, Mar 27, 2018 at 7:53 PM, Andrew Mart= in andrew@marti= nag.com.au <flyrotary@lancaironline.net> wrote:
Todd, a diode bridge in betw= een allows 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:

On Wed, 28 Mar 2018 at 10:46 am, Todd Bartrim = bartrim@gmail.com <flyr= otary@lancaironline.net> wrote:
Has anyone provided redundant power sources for their EC2?
=C2= =A0 Currently I have power supplied via a circuit breaker, but I'm cons= idering adding another power supply wire fed with a fuse.
However= they would both still feed through pins 33 & 34 which are internally c= onnected. 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 c= ause both the fuse and CB to blow.=C2=A0
=C2=A0 =C2=A0I'm jus= t trying to take care of a last few things on my list before taking this pl= ane up to the airport and something I'd added to the list many years ag= o was redundant power for the EC2 since a failure of that could really ruin= my day.
=C2=A0 =C2=A0 Since the most likely point of failure (ev= en though it's quite unlikely) would be the DB37 pin connector on the E= C2, I'm not sure that it is worth the effort to open up the connector s= hell to add another power wire.
=C2=A0 I've changed my mind o= n this several times over the last while and now I'm running low on tim= e so I'd throw it out for the collective wisdom of the group.

Todd Bartrim=C2=A0 =C2=A0 (can't think of an= ything witty to sign off with) (I still miss Rusty's witt, for those th= at remember him)

C-FSTB
RV9 Turbo13B
--=C2=A0
--
Regards Andrew Martin Martin Ag

--
Regards Andrew Martin Martin Ag --001a114192581f93560568706140--