X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 23 Aug 2005 09:46:19 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m28.mx.aol.com ([64.12.137.9] verified) by logan.com (CommuniGate Pro SMTP 5.0c1) with ESMTP id 678299 for lml@lancaironline.net; Mon, 22 Aug 2005 17:33:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.9; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m28.mx.aol.com (mail_out_v38_r4.1.) id q.1ee.4259d7fe (3310) for ; Mon, 22 Aug 2005 17:33:08 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <1ee.4259d7fe.303b9e94@aol.com> X-Original-Date: Mon, 22 Aug 2005 17:33:08 EDT Subject: Re: [LML] LNC2 50 Amp Breaker X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1124746388" X-Mailer: 9.0 Security Edition for Windows sub 5009 X-Spam-Flag: NO -------------------------------1124746388 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 8/22/2005 2:24:18 P.M. Central Standard Time, bobjude@charter.net writes: I turn power off with the relays power. Bob, On second thought, that seems like a superb way to run the monthly tests. Just pull the relay breaker if that's how it was wired. In an emergency (such as a bad relay), the checklist should still provide for pulling the motor breaker. You wrote: If that 50 A breaker ever popped in flight, I don't think I would want to try to reset it until I landed. I certainly agree with that. I guess you could check that the transition light won't come on in case the breaker is covered up (assuming the transition light is testable). You also wrote: "How would you turn power off?" What the heck? Nothing is perfect. And that's what the thermal protection is for. If the intermittent duty relays are selected long enough, they will fail. The only way I could imagine the thermal protection popping is the motor overheating from having to work up to its internal pressure relief because of a failed pressure switch or a stuck relay - maybe also because there is no fluid to pump. Interesting for those LML readers that haven't thought about their gear system lately...... Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------1124746388 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 8/22/2005 2:24:18 P.M. Central Standard Time,=20 bobjude@charter.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I turn=20 power off with the relays power.

Bob,

On second thought, that seems like a superb way to run the monthly=20 tests. Just pull the relay breaker if that's how it was wired.

In an emergency (such as a bad relay), the checklist should still provi= de=20 for pulling the motor breaker.

You wrote:

If that 50 A breaker ever popped in flight, I don't
think I wo= uld=20 want to try to reset it until I landed.

I certainly agree with that. I guess you could check that the=20 transition light won't come on in case the breaker is covered up (assum= ing=20 the transition light is testable).

You also wrote:

"How would you turn power off?"
What the heck? Nothing is perfect.&n= bsp;=20 And that's what the thermal protection
is for.

If the intermittent duty relays are selected long enough, they wil= l=20 fail. The only way I could imagine the thermal protection popping is t= he=20 motor overheating from having to work up to its internal pressure relief bec= ause=20 of a failed pressure switch or a stuck relay - maybe also because there is n= o=20 fluid to pump.

Interesting for those LML readers that haven't thought about their gear= =20 system lately......=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

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