X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 715022 for flyrotary@lancaironline.net; Thu, 08 Sep 2005 01:20:22 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao12.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20050908051926.NPYY11315.fed1rmmtao12.cox.net@BigAl> for ; Thu, 8 Sep 2005 01:19:26 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Overvoltage control Date: Wed, 7 Sep 2005 22:19:43 -0700 Message-ID: <000001c5b434$ebe30530$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5B3FA.3F867720" 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 V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5B3FA.3F867720 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Overvoltage control =20 Does any one know of a simple inline overvoltage control that can be installed in the alternator power lead. I have an internal regulator, alternator and the overvoltage units at ACS are part of a voltage = regulator and quite pricey too. JohnD =20 John; =20 B&C Specialty Parts, http://www.bandcspecialty.com/ printable catalog, = page 8, part #OMV-14; $35. =20 Al =20 =20 BTW, if this is the same as the module I used on my RV-8, it works by tripping a breaker when the over voltage occurs. Normally, the breaker = is supplying field current to an alternator, which almost always means an external regulator. If you don't have a low current way to break the = field current, and need to break the high current line, then you have to used = this OV module to trip a breaker that's holding in a main contactor for your = high current "B" lead. If any of that was confusing, Ed can explain it :-) =20 Yes; you've got that right, this OV module (oh, was that part number = OVM-14? - oh well) provides a circuit to ground in the event of over voltage. I have an internal regulator, but I went in and did the surgery to = disconnect the regulator from the output so I could provide the field current from = an external circuit. The OVM then trips the field current breaker in the = event of excessive output voltage. =20 Al ------=_NextPart_000_0001_01C5B3FA.3F867720 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Subject: [FlyRotary] Re: Overvoltage control

 

Does any one know of a = simple inline overvoltage control that can be installed in the alternator power = lead.  I have an internal regulator, alternator and the overvoltage units at = ACS are part of a voltage regulator and quite pricey too.  = JohnD

 

John;

 

B&C Specialty Parts, http://www.bandcspecialty.com/ printable catalog, page 8, part #OMV-14; $35.

 

Al =  

 

BTW, if this is = the same as the module I used on my RV-8, it works by tripping a breaker when the over voltage occurs.  Normally, the breaker is supplying field current to an alternator, which almost always means an = external regulator.  If you don't have a low current way to break the = field current, and need to break the high current line, then you have to used = this OV module to trip a breaker that's holding in a main contactor for your high current "B" lead.  If any of that was confusing, Ed = can explain it :-)

 

Yes; you’ve got that right, = this OV module (oh, was that part number OVM-14? – oh well) provides a = circuit to ground in the event of over voltage.  I have an internal regulator, = but I went in and did the surgery to disconnect the regulator from the output so I = could provide the field current from an external circuit. The OVM then trips = the field current breaker in the event of excessive output = voltage.

 

Al

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