X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [206.46.252.40] (HELO vms040pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 960709 for flyrotary@lancaironline.net; Mon, 23 May 2005 13:01:21 -0400 Received: from verizon.net ([71.99.162.85]) by vms040.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IGY009CRCLZRUN0@vms040.mailsrvcs.net> for flyrotary@lancaironline.net; Mon, 23 May 2005 12:01:12 -0500 (CDT) Date: Mon, 23 May 2005 13:01:07 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: EC2 problems In-reply-to: To: Rotary motors in aircraft Message-id: <42920C53.60303@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------060102020002090208030005 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------060102020002090208030005 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Me too. To me it's incredible that the choke would burn out, but the 5 volt regulators survive. What else is the choke feeding? If I were John, I would temporarily put a 1/2 Amp fast blow fuse in series with the 12V input to the EC-2, just to prevent the EC-2 buring up again. Remove the fuse when everything is working (any potential short or miswiring located and handled. Of course remove fuse well before any flight!!!! Finn Mark R Steitle wrote: > 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 > > To: Rotary motors in aircraft > > 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 > > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html > --------------060102020002090208030005 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Me too. To me it's incredible that the choke would burn out, but the 5 volt regulators survive. What else is the choke feeding?

If I were John, I would temporarily put a 1/2 Amp fast blow fuse in series with the 12V input to the EC-2, just to prevent the EC-2 buring up again. Remove the fuse when everything is working (any potential short or miswiring located and handled. Of course remove fuse well before any flight!!!!

Finn

Mark R Steitle wrote:

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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>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html

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