flyrotary@lancaironline.net Mailing List Archive

https://www.bandc.aero/essentialbusdiodew8wattheatsink.aspx

Aero Electric is where I got this info from when wiring my plane. I used similar part as above but without the heatsink. just bolted it to airframe, in reality I dont think much heat is generated as not much power goes through the diode unless you try to power everything through it. but I do think I used 25a units just because I had them available and did not want the diodes capacity to be a limiting factor.

Andrew

On Wed, Mar 28, 2018 at 11:12 AM, 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

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Regards Andrew Martin Martin Ag

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Regards Andrew Martin Martin Ag