X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=L5hfeKb8 c=1 sm=1 tr=0 a=QRQ8+DjROdOifacHCpgN6Q==:117 a=UBbGyR15AvBN+sP1Yy9S/Q==:17 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=v2DPQv5-lfwA:10 a=r77TgQKjGQsHNAKrUKIA:9 a=eRLigfuSAAAA:8 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=_6GpL_ENAAAA:8 a=7zWs-LIej8zFHtuZR_4A:9 a=o-oRgDEoh5fsuuso:21 a=L_x_8HcQJHzJN6kP:21 a=QEXdDO2ut3YA:10 a=4PR2P7QzAAAA:8 a=D79I_gGtrki0E4YtUdsA:9 a=T4A4sRTUfhQP2f8d:21 a=rv_walc4Ayv1Jrh_:21 a=A_rFwH9TnB6JEkYZ:21 a=_W_S_7VecoQA:10 a=BfhXYjFvZD4iae-mNffo:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=4dqwQCo7Po2mVW515mGf:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-yw0-f171.google.com ([209.85.161.171] verified) by logan.com (CommuniGate Pro SMTP 6.2.2) with ESMTPS id 10880755 for flyrotary@lancaironline.net; Wed, 28 Mar 2018 09:56:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.161.171; envelope-from=ceengland7@gmail.com Received: by mail-yw0-f171.google.com with SMTP id e17so818310ywa.1 for ; Wed, 28 Mar 2018 06:56:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=AwV6hszQMWVHJiHva00OYXsvD008LweYbUXq239EcQI=; b=Vq0hCVokmcYXZAj5s3aRgPpZpvOwcDrhQxQlKPDf4HMf8wuPvbjKkODszSV/XV0Iva bgOr5/tgUxmAWh1ORAXY/Nv4lldgMvNOMp6D1wQ44Ev8B7BkTwexkBLpF/svRX5/IZ48 yYpGRz1fPEW/Mi/ODaNv8O8k0uTbfDaAAjb7qXzoA4tvbd2fDeAWbAbdL6IWQpdBOm9v XfIUF6wn7/blvmXrwYOVh+DAAYhzsdgS/CO6q3NCSy65c9GROVRMCQl69Yaw3W7gcq0F I01ltLY4mDpMTOQ74vbQ4EYYB/9GduYGmvZiElWYA6uphvNlYtzYNexpwK6T7nwrGZwG J5/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=AwV6hszQMWVHJiHva00OYXsvD008LweYbUXq239EcQI=; b=dgx3JY/JYytOmQRbIvi8nFYjAl4IMVmA53TmvYPutn+Svcdwm1c1XAlV8+pkyEuwFh EiMA5+cUTF9ekwOkhk2JeDoam9HX3j6rPg5jkoPpOuV0pgut/0iOmSF7HhNA91XkJWtZ 68KCb8hyD6cxplVna2v35zfsnD9baGZYl8nV/V1R9u55QQ0TbZfprjPFa2zFVVJIOTud GENDy9xV/ekyz9XTTfiWavz+VQly4cwvxO2YNjaQ78p9TNiPPxOYwdC48o1dUhrXyJDl jUPi3YgsY5h/dF/NomQ48SgzF1QeD8ShlYWbwGe6Qfy9Stpg7ESSFpI8o4T9ssLFQ0w3 3nTg== X-Gm-Message-State: AElRT7E3/ArdcsZMkwoBUtNym0ZB4uorGzEopSQEzWTeASAMeP/BiAA3 LqWyvSmVzmz11AdJHHsdX1fqNQ== X-Google-Smtp-Source: AIpwx4+UyENUXscunCB9P95Sfen4DeEAzrp6aRRDMt3mFYaZMPlW+LRw4HzeGruV76mSZzMfx1uFtQ== X-Received: by 10.13.197.68 with SMTP id h65mr2156496ywd.195.1522245399367; Wed, 28 Mar 2018 06:56:39 -0700 (PDT) Return-Path: Received: from [192.168.10.217] ([166.137.98.110]) by smtp.googlemail.com with ESMTPSA id i63sm1392917ywf.90.2018.03.28.06.56.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Mar 2018 06:56:38 -0700 (PDT) Subject: Re: [FlyRotary] Re: back-up power for EC2 To: Rotary motors in aircraft References: Message-ID: <3a69635c-265c-a3f0-7e69-d573d324afa7@gmail.com> Date: Wed, 28 Mar 2018 08:56:27 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------5F2D4CE55A8FC45034454808" Content-Language: en-US X-Antivirus: Avast (VPS 180328-2, 03/28/2018), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. --------------5F2D4CE55A8FC45034454808 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit It's been a while since I've looked at those connectors. But if they are solid pins (not the really cheap rolled sheet metal), they are typically good for at least 5A continuous. IIRC, the machined pins made for crimping on cable ends can be used up to 7A. Charlie On 3/27/2018 11:41 PM, Andrew Martin andrew@martinag.com.au wrote: > Be careful if you decide to separate the Vin inside the ec2, I thought > each pin in those plugs is only rated to 1a, so both need to supply > power at all times. > Andrew > > On Wed, 28 Mar 2018 at 11:37 am, Todd Bartrim bartrim@gmail.com > > wrote: > > Ah, yes. I understand you now. I've used them myself in the past. > I used on to isolate my endurance buss from the main buss. > Just looked at your link and yeah, thats the same idea. I never > used the heatsink though. Also used one to wire up my landing > lights with an alternate feed for a wigwag flasher. >   I think at work I probably have in my spare parts bin several > large diodes as well. > Yes, that should be fairly easy to accomplish. > > Thanks. Anybody else have any comments? Tomorrow... > > Todd   (everybody back east is in bed already, while they're just > getting up down under) > > Todd Bartrim > > On Tue, Mar 27, 2018 at 8:12 PM, Andrew Martin > andrew@martinag.com.au > > > wrote: > > No. Add one of those 4 post diodes externally. If I can find > mine I’ll 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 > > 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 > 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 > > 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 > > 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 > > > -- > Regards Andrew Martin Martin Ag > > > -- > Regards Andrew Martin Martin Ag --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --------------5F2D4CE55A8FC45034454808 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
It's been a while since I've looked at those connectors. But if they are solid pins (not the really cheap rolled sheet metal), they are typically good for at least 5A continuous. IIRC, the machined pins made for crimping on cable ends can be used up to 7A.

Charlie

On 3/27/2018 11:41 PM, Andrew Martin andrew@martinag.com.au wrote:
Be careful if you decide to separate the Vin inside the ec2, I thought each pin in those plugs is only rated to 1a, so both need to supply power at all times.
Andrew

On Wed, 28 Mar 2018 at 11:37 am, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
Ah, yes. I understand you now. I've used them myself in the past. I used on to isolate my endurance buss from the main buss.
Just looked at your link and yeah, thats the same idea. I never used the heatsink though. Also used one to wire up my landing lights with an alternate feed for a wigwag flasher.
  I think at work I probably have in my spare parts bin several large diodes as well.
Yes, that should be fairly easy to accomplish.

Thanks. Anybody else have any comments? Tomorrow...

Todd   (everybody back east is in bed already, while they're just getting up down under)

Todd Bartrim

On Tue, Mar 27, 2018 at 8:12 PM, Andrew Martin andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:
No. Add one of those 4 post diodes externally. If I can find mine I’ll 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 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 <andrew@martinag.com.au> 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

--
Regards Andrew Martin Martin Ag

--
Regards Andrew Martin Martin Ag


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