X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 26 Nov 2013 08:41:11 -0500 Message-ID: X-Original-Return-Path: Received: from mail-ie0-f169.google.com ([209.85.223.169] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6614756 for lml@lancaironline.net; Tue, 26 Nov 2013 08:40:33 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.169; envelope-from=mwsletten@gmail.com Received: by mail-ie0-f169.google.com with SMTP id e14so9428693iej.0 for ; Tue, 26 Nov 2013 05:39:59 -0800 (PST) MIME-Version: 1.0 X-Received: by 10.50.111.74 with SMTP id ig10mr5474997igb.56.1385473199655; Tue, 26 Nov 2013 05:39:59 -0800 (PST) Received: by 10.64.226.166 with HTTP; Tue, 26 Nov 2013 05:39:59 -0800 (PST) In-Reply-To: References: X-Original-Date: Tue, 26 Nov 2013 07:39:59 -0600 X-Original-Message-ID: Subject: Re: [LML] Re: A couple Tyco papers on emf reduction in relays From: Mark Sletten X-Original-To: Lancair Mailing List X-Original-Cc: Colyn Case Content-Type: multipart/alternative; boundary=089e01294576e954f604ec149d83 --089e01294576e954f604ec149d83 Content-Type: text/plain; charset=ISO-8859-1 Here's an interesting (and recent) discussion on the relative virtues of solid state and mechanical contactors: http://forums.matronics.com/viewtopic.php?p=413626&sid=9817b0f8b99952e9555988e0e6713443 --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 > > > > > > --089e01294576e954f604ec149d83 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Here's an interesting (and recent) discussion on the r= elative virtues of solid state and mechanical contactors:

http://forums.matronics.com/viewtopic.= php?p=3D413626&sid=3D9817b0f8b99952e9555988e0e6713443

--Mark

=
On Tue, Nov 26, 2013 at 1:55 AM, Colyn Case = <colyncase@earthlink.net> wrote:
...and h= ere is the link to the kilovac catalog. =A0Even 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. =A0 see below:

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

I just stumbled across these while researching somet= hing else.

Recently there have been some referenc= es to how to protect switch circuits connected to relays. =A0Here are two p= apers done by Tyco which have been corroborated by certain others and are c= onsistent with Eric Jones' recommended use of Snapjacks (bi-directional= zener diodes).

Some methods (not recommended here) of protecting the s= witch contact result in extending the opening time of the relay, which caus= es arcing, bouncing and degeneration of the relay contacts. =A0(not a good = thing for maximizing starter current).

If you are going to do something in this department, I = highly recommend reading these. =A0(or just use EV100 relays and be done wi= th it)


Coil Suppression Can Reduce Relay Life (13C3264) - Jun 21, 2013

Here is also some info from Eric's website:

=



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