X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6614868 for lml@lancaironline.net; Tue, 26 Nov 2013 09:39:26 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.63; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=Z6r6SWCDXTtDddCAyk0e7UlPu/ta4Y7jxGsTFod4bsrqkDWokS6i+yssmGllbeJm; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [70.105.253.253] (helo=[192.168.1.24]) by elasmtp-junco.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1VlJml-0000D2-EZ for lml@lancaironline.net; Tue, 26 Nov 2013 09:38:43 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-247--852370122 Subject: Re: [LML] Re: A couple Tyco papers on emf reduction in relays Date: Tue, 26 Nov 2013 09:38:42 -0500 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <71698518-525B-4BD9-94B1-7C30290E8AA0@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940e1a8a6799d03560854ad7b2cf7475e39350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.105.253.253 --Apple-Mail-247--852370122 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Very cool. Gigavac has some new and better stuff according to Eric = Jones. On Nov 26, 2013, at 8:41 AM, Mark Sletten wrote: Here's an interesting (and recent) discussion on the relative virtues of = solid state and mechanical contactors: = http://forums.matronics.com/viewtopic.php?p=3D413626&sid=3D9817b0f8b99952e= 9555988e0e6713443 --Mark On Tue, Nov 26, 2013 at 1:55 AM, Colyn Case = wrote: ...and here is the link to the kilovac catalog. Even if you don't buy = them, it's a good reference for what to look for. Kilovac High Voltage Relays On Nov 26, 2013, at 2:37 AM, Colyn Case wrote: links have changed. see below: On Nov 25, 2013, at 9:06 PM, Colyn Case wrote: I just stumbled across these while researching something else. Recently there have been some references to how to protect switch = circuits connected to relays. Here are two papers done by Tyco which = have been corroborated by certain others and are consistent with Eric = Jones' recommended use of Snapjacks (bi-directional zener diodes). Some methods (not recommended here) of protecting the switch contact = result in extending the opening time of the relay, which causes arcing, = bouncing and degeneration of the relay contacts. (not a good thing for = maximizing starter current). If you are going to do something in this department, I highly recommend = reading these. (or just use EV100 relays and be done with it) Application of Coil Suppression with DC Relays (13C3311) - Jun 21, 2013 Coil Suppression Can Reduce Relay Life (13C3264) - Jun 21, 2013 Here is also some info from Eric's website: http://www.periheliondesign.com/suppressors/SnapJack.pdf --Apple-Mail-247--852370122 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii Very cool.  Gigavac has some new and better stuff according to Eric Jones.

On Nov 26, 2013, at 8:41 AM, Mark Sletten wrote:

Here's an interesting (and recent) discussion on the relative virtues of solid state and mechanical contactors:


--Mark


On Tue, Nov 26, 2013 at 1:55 AM, Colyn Case <colyncase@earthlink.net> wrote:
...and here is the link to the kilovac catalog.  Even if you don't buy them, it's a good reference for what to look for.


On Nov 26, 2013, at 2:37 AM, Colyn Case wrote:

links have changed.   see below:

On Nov 25, 2013, at 9:06 PM, Colyn Case wrote:

I just stumbled across these while researching something else.

Recently there have been some references to how to protect switch circuits connected to relays.  Here are two papers done by Tyco which have been corroborated by certain others and are consistent with Eric Jones' recommended use of Snapjacks (bi-directional zener diodes).

Some methods (not recommended here) of protecting the switch contact result in extending the opening time of the relay, which causes arcing, bouncing and degeneration of the relay contacts.  (not a good thing for maximizing starter current).

If you are going to do something in this department, I highly recommend reading these.  (or just use EV100 relays and be done with it)



Here is also some info from Eric's website:








--Apple-Mail-247--852370122--