X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.25.9.101] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2223538 for flyrotary@lancaironline.net; Tue, 31 Jul 2007 21:05:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-02.southeast.rr.com (8.13.6/8.13.6) with SMTP id l7114dLp000331 for ; Tue, 31 Jul 2007 21:04:39 -0400 (EDT) Message-ID: <002e01c7d3d8$085e6870$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] EM2 update & outing my incompetance Date: Tue, 31 Jul 2007 21:05:20 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01C7D3B6.80D0E1B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_002B_01C7D3B6.80D0E1B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Switches have bitten more than one, Chris. =20 There was one individual who burnt out a couple EC2s because he = purchased some bargain switches. Most double throw switches "Break" = before "Make" - meaning the common part of the switch Breaks the old = contact before Making the new contact. However, there are some (not too = common) which "Make" before "Break". The old contact is still connected = to the common part of the switch when it makes connection with the other = contacts of the switch. In this case the "MAKE" routed 12 Volts to a pin that could only handle = 5 volts before the "Break" action happened and removed the common pins = of the switch from the 12 Volt source. This can really be a puzzle to = diagnose after putting switches in - because if you measure the voltage = before and after the switch action everything appears normal. Its only = a momentary contact during the switching action that the two circuits = are connected - so once the switch action is completed the incriminating = MAKE action is no longer apparent. The bottom line is all switches are Not alike and I recommend checking = with volt ohm meter to determine which type you have, especially if you = got them from a bargain or surplus source. Great to hear the good news!! Ed ----- Original Message -----=20 From: "Christopher Barber" To: "Rotary motors in aircraft" Sent: Tuesday, July 31, 2007 8:16 PM Subject: [FlyRotary] EM2 update & outing my incompetance > Well, Dave Staten, my building buddy, came through and saved the day. = I > was scratching my head over the EM issue and he suggested we revisit = the > buttons. Ok, no problem. Well, I had gotten too close to the issue. > Apparantly I got momentary switches that were reversed of the needed = type > (ie normally closed/normally open...opps. DOH). >=20 > The switches that came with the unit were misplaced ages ago and these = were > what we had around...then replaced by new ones that were = identical....but > new (...just still wrong). Well, we disconnected them all and the = unit > came back up to normal. NOW, that does not explain why it was working = at > first....but in this case I really don't care what is WAS doing as = long it > is it working well now. I will replace with the proper switches = tomorrow > after work. >=20 > Now on to the PCM wiring issue and the PSRU throwing oil out of the = forward > spline (hopefully we just overfilled the engine oil). Ok, this is fun = again > . >=20 > THANKS GUYS FOR HELP HOLD THIS JUNIOR ELECTICIANS HAND!!!! YOU ARE = ALL VERY > APPRICIATED. THANKS DAVE. >=20 > All the best, >=20 > Chris > moving forward....towards success (?) ;-) >=20 >=20 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_002B_01C7D3B6.80D0E1B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Switches have bitten more than one, = Chris. =20
 
There was one individual who burnt out = a couple=20  EC2s because he purchased some bargain switches.  Most double = throw=20 switches "Break" before "Make" - meaning the common part of the switch=20  Breaks the old contact before Making the new=20 contact.  However, there are some (not too common) which "Make" = before=20 "Break". The old contact is still connected to the common part = of the=20 switch when it makes connection with the other contacts of the = switch.
 
 In this case the "MAKE" routed 12 Volts to = a pin=20 that could only handle 5 volts before the "Break" action happened and = removed=20 the common pins of the switch from the 12 Volt source.  This can = really be=20 a puzzle to diagnose after putting switches in - because if you measure = the=20 voltage before and after the switch action everything appears = normal.  Its=20 only a momentary contact during the switching action that the two = circuits are=20 connected - so once the switch action is completed the incriminating = MAKE action=20 is no longer apparent.
 
The bottom line is all switches are = Not=20 alike and I recommend checking with volt ohm meter to determine which = type you=20 have,  especially if you got them from a bargain or surplus=20 source.
 
Great to hear the good news!!
 
Ed
 
----- Original Message -----
From: "Christopher Barber" <CBarber@TexasAttorney.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, July 31, 2007 8:16 = PM
Subject: [FlyRotary] EM2 update & outing my=20 incompetance

> Well, = Dave Staten,=20 my building buddy,  came through and saved the day.  I
> = was=20 scratching my head over the EM issue and he suggested we revisit = the
>=20 buttons.  Ok, no problem. Well, I had gotten too close to the=20 issue.
> Apparantly I got momentary switches that were reversed of = the=20 needed type
> (ie normally closed/normally open...opps. = DOH).
>=20
> The switches that came with the unit were misplaced ages ago = and these=20 were
> what we had around...then replaced by new ones that were=20 identical....but
> new (<g>...just still wrong).  Well, = we=20 disconnected them all and the unit
> came back up to normal.  = NOW,=20 that does not explain why it was working at
> first....but in this = case I=20 really don't care what is WAS doing as long it
> is it working = well=20 now.  I will replace with the proper switches tomorrow
> = after=20 work.
>
> Now on to the PCM wiring issue and the PSRU = throwing oil=20 out of the forward
> spline (hopefully we just overfilled the = engine=20 oil).  Ok, this is fun again
> <g>.
>
> = THANKS=20 GUYS FOR HELP HOLD THIS JUNIOR ELECTICIANS HAND!!!!  YOU ARE ALL=20 VERY
> APPRICIATED.  THANKS DAVE.
>
> All the=20 best,
>
> Chris
> moving forward....towards success = (?)=20 ;-)
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive=20 and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_002B_01C7D3B6.80D0E1B0--