X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.143] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 960683 for flyrotary@lancaironline.net; Mon, 23 May 2005 12:45:19 -0400 Received-SPF: none receiver=logan.com; client-ip=129.116.87.143; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C55FB6.B32E3706" Subject: RE: [FlyRotary] Re: EC2 problems Date: Mon, 23 May 2005 11:44:34 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E016C1926@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: EC2 problems Thread-Index: AcVftaBqyz1g5EWUTWmbe+YSUMiCaAAAIGrw From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C55FB6.B32E3706 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Tracy, Welcome back... you were missed. =20 =20 I'm not an EE, but I have to ask. How much of an over-voltage would it take to burn out the input power filter choke and shut down the EC-2. Could this happen from a failed alternator voltage-regulator? Is there something other builders could do to prevent this from happening to them? =20 =20 Thanks, Mark S.=20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Monday, May 23, 2005 11:14 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: EC2 problems =20 Hello John, True, the bench here is not perfect (and neither is the operator : ) =20 Got your EC2 back today and have looked at it briefly. Visual inspection showed that the input power filter choke was suspiciously dark in color. Plugged the unit into the test bench and bench EM2 did indeed show NOP in the Tach window which means the EC2 is not responding to interrogation by the EM2. No ignition or injection pulses from the EC2 at any rpm. Found that there was no +5 voltage on board. Cause was the input filter choke being open. Replaced the choke and EC2 became fully operational. =20 =20 I must emphasize that the open choke was not an ordinary component failure. It was burned open by an overload. The overload was not caused by any problem in the EC2 so I have to conclude that it was caused by an external wiring error or abnormal electrical system voltage. I know you have checked the wiring innumerable times but I can't draw any other conclusion. Wish I could point to the specific area where the problem is but there are too many possibilities to make any reasonable guesses. I'd fly down again to check it myself but things have backed up way too far here in my absence. =20 Tracy Crook =20 ----- Original Message -----=20 From: John Slade =20 To: Rotary motors in aircraft =20 Sent: Saturday, May 21, 2005 10:57 AM Subject: [FlyRotary] Re: EC2 problems=20 =20 > Tracy's bench is not perfect, believe it or not :>) I guess nothing's perfect. That does complicate the logic doesn't it. =09 I'll check around for voltages in the wrong places while I wait for the diagnosis / repair. Thanks, John =09 =09 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------_=_NextPart_001_01C55FB6.B32E3706 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Tracy,

Welcome back… you were = missed. 

 

I’m not an EE, but I have to ask.  How much of an over-voltage would it take to burn out the = input power filter choke and shut down the EC-2.  Could this happen from = a failed alternator voltage-regulator?  Is there something other = builders could do to prevent this from happening to them?  =

 

Thanks,

=

Mark S. =

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Monday, May 23, = 2005 11:14 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = EC2 problems

 

Hello = John,

True, the = bench here is not perfect (and neither is the operator : = )

 

Got your EC2 = back today and have looked at it briefly.  Visual inspection showed that = the input power filter choke was suspiciously dark in color.  Plugged = the unit into the test bench and bench EM2 did indeed show NOP in the Tach window = which means the EC2 is not responding to interrogation by the EM2.  = No ignition or injection pulses from the EC2 at any rpm.   Found = that there was no +5 voltage on board.  Cause was the input = filter choke being open.   Replaced the choke and EC2 became = fully operational. 

 

I must = emphasize that the open choke was not an ordinary component failure.  It was = burned open by an overload.  The overload was not caused by any problem in the = EC2 so I have to conclude that it was caused by an external wiring error or = abnormal electrical system voltage.  I know you have checked the wiring = innumerable times but I can't draw any other conclusion.  Wish I could point to = the specific area where the problem is but there are too many possibilities = to make any reasonable guesses.  I'd fly down again to check it myself but things have backed up way too far here in my = absence.

 

Tracy = Crook 

----- Original Message ----- =

From: John Slade =

Sent: Saturday, May 21, 2005 10:57 = AM

Subject: [FlyRotary] Re: EC2 problems

 

> = Tracy's bench is not perfect, = believe it or not :>)
I guess nothing's perfect. That does complicate the logic doesn't = it.

I'll check around for voltages in the wrong places while I wait for = the
diagnosis / repair.
Thanks,
John


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