From: "Todd Bartrim bartrim@gmail.com" <flyrotary@lancaironline.net>
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Date: Tue, 27 Mar 2018 20:04:30 -0700
Message-ID: <CALYfWBs0vk_sbh2BH_AK6jQ0ktnE0yxQ7xs6SxE6C+-S6V6jfA@mail.gmail.com>
Subject: Re: [FlyRotary] Re: back-up power for EC2
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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
>

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<div dir=3D"ltr">Hi Andrew;<div>=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.</div><div>=C2=A0=C2=A0</div></di=
v><div class=3D"gmail_extra"><br clear=3D"all"><div><div class=3D"gmail_sig=
nature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr">Todd Bartrim</d=
iv></div></div>
<br><div class=3D"gmail_quote">On Tue, Mar 27, 2018 at 7:53 PM, Andrew Mart=
in <a href=3D"mailto:andrew@martinag.com.au">andrew@martinag.com.au</a> <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:flyrotary@lancaironline.net" target=3D=
"_blank">flyrotary@lancaironline.net</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex"><div><div dir=3D"auto">Todd, a diode bridge in between al=
lows 2 separate power feeds and keeps them isolated.</div><div dir=3D"auto"=
>Andrew</div><div><div class=3D"h5"><br><div class=3D"gmail_quote"><div>On =
Wed, 28 Mar 2018 at 10:50 am, Andrew Martin &lt;<a href=3D"mailto:andrew@ma=
rtinag.com.au" target=3D"_blank">andrew@martinag.com.au</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex"><div><br><div class=3D"gmail_quote"><di=
v>On Wed, 28 Mar 2018 at 10:46 am, Todd Bartrim <a href=3D"mailto:bartrim@g=
mail.com" target=3D"_blank">bartrim@gmail.com</a> &lt;<a href=3D"mailto:fly=
rotary@lancaironline.net" target=3D"_blank">flyrotary@lancaironline.net</a>=
&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Has anyone provide=
d redundant power sources for their EC2?<div>=C2=A0 Currently I have power =
supplied via a circuit breaker, but I&#39;m considering adding another powe=
r supply wire fed with a fuse.</div><div>However they would both still feed=
 through pins 33 &amp; 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</div><div>=C2=A0 =C2=A0I&#39;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&#39;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.</div><div>=C2=A0 =
=C2=A0 Since the most likely point of failure (even though it&#39;s quite u=
nlikely) would be the DB37 pin connector on the EC2, I&#39;m not sure that =
it is worth the effort to open up the connector shell to add another power =
wire.</div><div>=C2=A0 I&#39;ve changed my mind on this several times over =
the last while and now I&#39;m running low on time so I&#39;d throw it out =
for the collective wisdom of the group.</div><div><br></div><div><div><div =
class=3D"m_-4423690028794149780m_9031529786505675638m_3633150888657227628gm=
ail_signature" data-smartmail=3D"gmail_signature"><div>Todd Bartrim=C2=A0 =
=C2=A0 (can&#39;t think of anything witty to sign off with) (I still miss R=
usty&#39;s witt, for those that remember him)</div><div><br></div><div>C-FS=
TB</div><div>RV9 Turbo13B</div></div></div>
</div></div>
</blockquote></div></div>--=C2=A0</blockquote></div></div></div></div><div =
class=3D"HOEnZb"><div class=3D"h5">-- <br><div dir=3D"ltr" class=3D"m_-4423=
690028794149780gmail_signature" data-smartmail=3D"gmail_signature">Regards
Andrew Martin
Martin Ag</div>
</div></div></blockquote></div><br></div>

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