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Yes, Jeff.
I had various problems with wiring, connections and internal EC2 issues (some of which were caused by inadvertent smoke release on my part). In my case the EC2 program A would simply reset at all zeros. I'd restore the defaults, run the engine for a while and bingo - back to the zeros. Program B was unaffected. I finally traced one problem to a bad connection at the DB36 connector on the EC2. The pins weren't going all the way in. I think this was because the male and female parts of the DB36 were not a matched pair. Each was of slightly different design. Perhaps Tracy changed suppliers somewhere between the original EC2 release and the later one I upgraded to. One of the intermittent connections was the one to the EM2. I eventually found it by pulling on the cable. Tracy also replaced some of the chips in my EC2. I'm still not certain what was causing the programming changes. I'm just thankful I was dealing with RWS and not some company in Australia. On one occasion I took the EC2 and EM2 by hand to Tracy. Laura gave me an ice cream while I waited for him to fix them. You just can't beat that for service!
John
82.6 hrs and no more EC2 or EM2 problems.
Jeff Owen wrote:
Al,
I seem to recall John Slade had similar problems with the programming
suddenly changing in an EC2. I believe he ultimately traced the problem to
intermittent connections between the EC2 and EM2.
John,
If you are listening, what was the root cause?
Jeff Owen
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Al Gietzen
Sent: Friday, December 29, 2006 6:59 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Yet another non-event story
I noticed my mixture bar was going from lean to totally
desapearing. Turning the knob to full rich was not enough.
I saw this a few times.
Buly;
It would be interesting to know if you had it previously tuned giving you
correct mixture. I have had on-going problems with spurious changes to
settings in the EC2. Carefully tune it one day, and find things have
changed the next, and have had tuning changes occur during flight. I have
noted changes in the mixture table, stage point setting, injector pulse
width. Many, many hours spent trying to determine cause, but as yet no
explanation. It has been assumed that it is specific to my installation -
composite pusher with EC control box at the firewall, EM2 acquisition module
at the firewall, display on the panel. The problem is primarily with
controller A which communicates with the EM2.
This may not be relevant to your installation, but it would be worth paying
close attention to getting it tuned correctly, and see if it stays that way.
Al
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