X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2601272 for flyrotary@lancaironline.net; Sun, 16 Dec 2007 19:50:52 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao107.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071217005001.BXQV2125.fed1rmmtao107.cox.net@fed1rmimpo01.cox.net> for ; Sun, 16 Dec 2007 19:50:01 -0500 Received: from BigAl ([72.192.143.193]) by fed1rmimpo01.cox.net with bizsmtp id Rcpx1Y0094AaN600000000; Sun, 16 Dec 2007 19:49:57 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EC-2 troubles Date: Sun, 16 Dec 2007 16:50:39 -0800 Message-ID: <000001c84046$d82c9d30$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C84003.CA095D30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C84003.CA095D30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Mark; =20 Yes; been there, done that. Seems unlikely to me that it is caused by = the solid state relay, but . .. . I have a standard relay for staging, and = have always had seamless staging and no issues with that; but I had serious issues with corruption of settings - MAP table, pulse setting, staging = point all corrupted at various times. Wiring changes to eliminate possible = noise pickup from other leads seemed to help, but didn't solve it.=20 =20 Finally added the following changes to the board: =20 1000pf capacitors were added to: =20 All fuel injector signals All ignition control signals RX input TX output =20 47uf, 16V tantalum were added to each processor =20 Pin 8 of connector is now grounded. Pin 28 of connector is now grounded. =20 That solved the problem for me. As we were making these changes and analyzing causes, both my son (my expert) and Tracy began to think that = that isolation diodes I have in the power circuits, to the EC2 and the = injectors and coils, to maintain independent power redundancy; likely exaggerated = the problem by not letting noise travel back to the battery (the big = filter). We never confirmed this; but likely you would not have to go to the same lengths in filtering if you did not have diode isolation of the = circuits. =20 Four more hours of flight time this week - just past 75 hours. Real = happy with my cruise at 200 mph (TAS) and 22 mpg. =20 Al (Velocity RG 20B) To refresh your memory, I recently installed the solid state staging = relay on my 20B Lancair ES. When doing the install, I didn't reinstall the = diode (to ground). During a short test flight after installing the solid = state relay, the map table got corrupted. I wrote for your advice and you instructed me to connect the diode. I reinstalled the diode to the = staging relay and went for a short 30 minute flight today. The "A" map table = again got corrupted. Switching to the "B" controller resulted in a smooth = running engine. After landing, I entered the EM-2 tracking mode and it was = obvious that the "A" map table was again corrupted. I have not reloaded the default map, in case you would like to take a picture of the EM-2 = display of the map table.=20 These are the only two instances of this happening that I can recall, = both cases happened after I installed the solid state injector staging relay. Could the relay possibly be related? =20 Also, I understand that others with composite a/c have had problems = similar to this (sporatic corruption of the MAP table). Have you been able to determine a common cause? Any suggestions? =20 I am posting this to the fly rotary group in hopes that someone on the = list may have already "been there, done that". =20 Thanks, Mark S. =20 ------=_NextPart_000_0001_01C84003.CA095D30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Mark;

 

Yes; been there, done that.  = Seems unlikely to me that it is caused by the solid state relay, but . .. . I = have a standard relay for staging, and have always had seamless staging and no = issues with that; but I had serious issues with corruption of settings – = MAP table, pulse setting, staging point all corrupted at various times.  = Wiring changes to eliminate possible noise pickup from other leads seemed to = help, but didn’t solve it.

 

Finally added the following = changes to the board:

 

1000pf capacitors were = added to:

 

All fuel injector = signals

All ignition control = signals

RX = input

TX = output

 

47uf, 16V tantalum were = added to each processor

 

Pin 8 of connector is now grounded.

Pin 28 of connector is = now grounded.

 

That solved the problem for me.   As we were making these changes = and analyzing causes, both my son (my expert) and Tracy began to think that that = isolation diodes I have in the power circuits, to the EC2 and the injectors and = coils, to maintain independent power redundancy; likely exaggerated the problem by = not letting noise travel back to the battery (the big filter).  We = never confirmed this; but likely you would not have to go to the = same lengths in = filtering if you did not have diode isolation of the circuits.

 

Four more hours of flight time this week – just past 75 hours. =  Real happy with my cruise at 200 mph (TAS) and 22 mpg.

 

Al =         (Velocity RG = 20B)


To refresh your memory, I recently installed the solid = state staging relay on my 20B Lancair ES.  When doing the install, I = didn't reinstall the diode (to ground).  During a short test flight after installing the solid state relay, the map table got corrupted.  I = wrote for your advice and you instructed me to connect the diode.  I = reinstalled the diode to the staging relay and went for a short 30 minute flight today.  The "A" map table again got corrupted.  = Switching to the "B" controller resulted in a smooth running = engine.  After landing, I entered the EM-2 tracking mode and it was obvious that = the "A" map table was again corrupted.   I have not = reloaded the default map, in case you would like to take a picture of the EM-2 = display of the map table.

These are the only two instances of this happening that I can recall, = both cases happened after I installed the solid state injector staging = relay.  Could the relay possibly be related? 

Also, I understand that others with composite a/c have had problems = similar to this (sporatic corruption of the MAP table).  Have you been able to determine a common cause?  Any suggestions? 

I am posting this to the fly rotary group in hopes that someone on the = list may have already "been there, done that". 

Thanks,
Mark S.



 

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