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Date: Fri, 27 Jul 2007 10:01:54 -0400
From: Finn Lassen <finn.lassen@verizon.net>
Subject: Re: [FlyRotary] EM2/EC2 question/update/vent/etc
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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How far is the control panel from the actual ECU box?
I suspect connection problem between the two.
Vitally critical is the ground path between the two.
Then there are things like "ground loops" and shields.
Is the control panel grounded to something else other than wire(s) 
directly to the ECU box?
The longer the wire run between the control panel and the ECU box, the 
more critical the shielding of the wires between the two.
If there are ground wire(s) in addition to the shield, I actually don't 
know of the shield must be grounded at both ends or at the ECU box only.

 From Burly's experience, the control panel connector must not be 
twisted or otherwise moved in relation to the circuit board in the 
control panel.

Intermittent connections are a bitch!

Finn


Christopher Barber wrote:
> This may be more of a vent than a real question.  However, if anyone has
> insight, I am willing to listen.  Also, this is NOT a complaint about the
> RWS products.  This IS an admission to my continuing developing skills (or
> lack there of) of wire systems and electrical troubleshooting.  Tracy has
> always been helpful and willing to provide even basic information.  I post
> here first to get the group wisdom and to try to spare Tracy the time as I
> am sure that following his travels, he is currently overwhelmed with work
> and emails....even though he and Laura have been great to respond to
> previous and current concerns previous to this one.  Gee, he is forgoing OSH
> where his presence can provide for the general good of the rotary community.
> Even though it is NOT prevalent on this list, sometimes expressing trouble
> shooting and/or proof of concept questions/concepts/experiences etc. some
> take the opportunity to go "see, that doesn't work" or makes the yet
> uninitiated nervous without realizing that the ability to share online
> OPENLY is one of the best safety devices we've got.
>
> Anyway, My engine is/was running much better now that I have plugged some
> intake leaks.  The auto tune seems to be playing nice.  However, following a
> short engine run two days ago, I went to inspect the engine (FWB in my Velo)
> and when I returned to the cabin, the EM2 was flickering.....then it seemed
> to set itself in the calibration mode (and the bottom row of reading are
> flickering and fading periodically).  I would try to clear it by hitting
> abort and it would flash the main screen for about a second and then return
> to the calibration mode, showing "coolant pressure".  Within the calibration
> mode, the values/modes will change when I press the control buttons as they
> should, however, when I try to get it to the main screen, it goes back to
> the calibration mode. My first thought was a bad/sticking switch/es.  So I
> replaced ALL four switches to no avail, checked the grounds and continuity
> of the wires.  No joy.  Seems too, the being in this mode "calibrated" my
> coolant temperature to zero (doh).
>
> When I started the engine (of course one of the easiest starts to date) in
> this mode, the engine was surging in a rhythmic pattern, even though pretty
> smoothly.
>
> I am a thinkin' that tonight I will re-terminated all the d-sub pins.
>
> Oh well, back to patrol....and then to the hangar (following a brief detour,
> hopefully brief, to the big Houston dog show to support Jana and the dogs
> she is showing.  This is her big hobby and she is usually good about
> supporting the plane)
>
> Thanks.  Thoughts are greatly appreciated.
>
> All the best,
>
> Chris
>
> Christopher Barber
> Attorney and Counselor at Law
> 5110 Bissonnet, No 418
> Bellaire, Texas 77401
>
> Serving the Needs of Senior Texans
>
> 281-464-LAWS (5297)
> 281-754-4168 Fax
> www.TexasAttorney.net
>
>
> --
> Homepage:  http://www.flyrotary.com/
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>
>
>