X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 27 Apr 2012 07:56:37 -0400 Message-ID: X-Original-Return-Path: Received: from imr-da02.mx.aol.com ([205.188.105.144] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5510390 for lml@lancaironline.net; Thu, 26 Apr 2012 13:29:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.144; envelope-from=Sky2high@aol.com Received: from mtaomg-mb03.r1000.mx.aol.com (mtaomg-mb03.r1000.mx.aol.com [172.29.41.74]) by imr-da02.mx.aol.com (8.14.1/8.14.1) with ESMTP id q3QHSQgf015903 for ; Thu, 26 Apr 2012 13:28:26 -0400 Received: from core-mtc004b.r1000.mail.aol.com (core-mtc004.r1000.mail.aol.com [172.29.235.13]) by mtaomg-mb03.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id C6C08E000082 for ; Thu, 26 Apr 2012 13:28:25 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <1c7bc.2603d931.3ccadfb9@aol.com> X-Original-Date: Thu, 26 Apr 2012 13:28:25 -0400 (EDT) Subject: Re: [LML] Re: Contactors vs Solid State Relays X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_1c7bc.2603d931.3ccadfb9_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 1:2:429435680:93952408 X-AOL-SCOLL-URL_COUNT: 1 x-aol-sid: 3039ac1d294a4f9985b97c4e --part1_1c7bc.2603d931.3ccadfb9_boundary Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en Consider that one possible failure mode is the welding of the contacts in = =20 which case it won't matter if it is for intermittent or continuous duty. = A=20 most helpful idea is to have an "indication" circuit off the solenoid=20 contacts to an indicator light on the panel. If the indicator light is o= n=20 after starting, turn off the master switch and the =20 engine........................ =20 Grayhawk =20 =20 In a message dated 4/26/2012 9:40:05 A.M. Central Daylight Time, =20 jbarrett@carbinge.com writes: =20 Fred.=20 Sounds like a better choice than we=E2=80=99ve been using. One question c= omes to=20 mind =E2=80=93 surrounding the idea I have (is it correct?) that the start= er=20 solenoid should be intermittent because you want it to be the weak link in= the=20 starter circuit: if the starter contactors should stick, you=E2=80=99d ha= ve a huge =20 amperage draw and maybe start a fire. If the contactor is intermittent, i= t=20 will theoretically fail and break the contact before the starter motor =20 burns up and catches fire or causes other damage.=20 Is this logic correct? If so, would the specs on this contactor from Cole= =20 Hershee still be a good choice for the starter circuit with the TSIO 550?= =20 24059-08 UL listed=20 Same as 24059, but UL and CE rated.=20 Continuous Rating: 65A at 12V DC. Intermittent rating:750A make, 100A=20 break. 10 sec On, 30 min Off. Circuit G1.=20 Thanks, John=20 =20 =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of=20 Frederick Moreno Sent: Thursday, April 26, 2012 4:50 AM To: lml@lancaironline.net Subject: [LML] Re: Contactors vs Solid State Relays =20 =20 =20 =20 Or a traditional mechanical contractor like a _Cole Hershee 24115_=20 (http://www.elecdirect.com/Data/ProductPDFs/CHh1.pdf) . =20 =20 =20 A friend is a marine specialist here in Australia and said that for off=20 shore marine applications, only the Cole Hershee contactors are approved = =20 because they are mission critical. Much more expensive than the el cheap= o=20 auto store contactor I was replacing, but even the auto store guys advocat= ed=20 these units for experimental aircraft because the quality standards are so= =20 much higher. The auto stores stocks both types, but many commercial =20 truck customers (we have many in town) will only use Cole Hershee. Made i= n=20 the UK, I believe.=20 Fred Moreno=20 =20 --part1_1c7bc.2603d931.3ccadfb9_boundary Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
Consider that one possible failure mode is the welding of the contacts= in=20 which case it won't matter if it is for intermittent or continuous=20 duty.  A most helpful idea is to have an "indication" circuit off the= =20 solenoid contacts to an indicator light on the panel.   If the=20 indicator light is on after starting, turn off the master switch and the=20 engine........................
 
Grayhawk
 
In a message dated 4/26/2012 9:40:05 A.M. Central Daylight Time,=20 jbarrett@carbinge.com writes:
=

Fred.

Sounds=20 like a better choice than we=E2=80=99ve been using.  One question co= mes to mind =E2=80=93=20 surrounding the idea I have (is it correct?) that the starter solenoid sh= ould=20 be intermittent because you want it to be the weak link in the starter=20 circuit:  if the starter contactors should stick, you=E2=80=99d have= a huge=20 amperage draw and maybe start a fire.  If the contactor is intermitt= ent,=20 it will theoretically fail and break the contact before the starter motor= =20 burns up and catches fire or causes other damage.

Is=20 this logic correct?  If so, would the specs on this contactor from C= ole=20 Hershee still be a good choice for the starter circuit with the TSIO=20 550?

<= SPAN=20 style=3D"FONT-FAMILY: 'Helvetica-Condensed-Bold','sans-serif'; COLOR: #23= 1f20; FONT-SIZE: 11pt">24059-08=20 UL listed

Same=20 as 24059, but UL and CE rated.

Continuous=20 Rating: 65A at 12V DC. Intermittent rating:750A make, 100A break. 10 sec = On,=20 30 min Off. Circuit G1.

 

Thanks,
John

 

 

 

 

From: Lancair Ma= iling=20 List [mailto:lml@lancaironline.net] On Behalf Of Frederick=20 Moreno
Sent: Thursday, April 26, 2012 4:50 AM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Contactors vs Solid St= ate=20 Relays

 

 

Or a traditional= =20 mechanical contractor like a Cole H= ershee=20 24115.

 A friend is a mar= ine=20 specialist here in Australia and said that for off shore marin= e=20 applications, only the Cole Hershee contactors are approved = =20 because they are mission critical.  Much  more expensive = than=20 the el cheapo auto store contactor I was replacing, but even the au= to=20 store guys advocated these units for experimental aircraft because = the=20 quality standards are so much higher.   The auto stores s= tocks=20 both types, but many commercial  truck customers (we have many= in=20 town) will only use Cole Hershee.  Made in the UK, I=20 believe.

Fred=20 Moreno

 

 

 

 

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