Return-Path: Sender: (Marvin Kaye) To: lml Date: Sat, 19 Jul 2003 08:13:50 -0400 Message-ID: X-Original-Return-Path: Received: from imo-r06.mx.aol.com ([152.163.225.102] verified) by logan.com (CommuniGate Pro SMTP 4.1b9) with ESMTP id 2479375 for lml@lancaironline.net; Sat, 19 Jul 2003 06:22:11 -0400 Received: from Sky2high@aol.com by imo-r06.mx.aol.com (mail_out_v36_r1.1.) id q.c3.361a248e (16781) for ; Sat, 19 Jul 2003 06:22:09 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sat, 19 Jul 2003 06:22:08 EDT Subject: Re: [LML] Re: Essential Buss versus Fuel Endurance X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1058610128" X-Mailer: 9.0 for Windows sub 370 -------------------------------1058610128 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en In a message dated 7/18/2003 9:29:25 PM Central Daylight Time,=20 kycshann@kyol.net writes: Why would you not know what has went wrong? I guess I=E2=80=99m missing som= ething=20 here. I guess we should evaluate the failure modes of the alternator. If i= t is=20 overloaded or shorted, the ANL pops and its disconnected. This occurs at=20 about 80A on an ANL limiter correct? If the internals of the alternator fai= ls,=20 the circuit breaker pops the field and again, its dead. If an=20 over/under/runaway voltage condition occurs, the regulator gets it and shuts= it down. If the=20 regulator has failed, the alternator is dead anyway because of not field. I= f=20 the belt to the alternator breaks, no output. Shannon, There is another way. I had a circumstance where a failing voltage regulato= r=20 started to overcharge the battery. The regulator allowed the bus voltage to= =20 get to about 15.1 volts (12 volt system, 14.3 is the usual running level)=20 before the VM EPI 800 System flipped on one of my idiot lights (VOLTAGE). A= fter=20 pulling the field breaker, I switched on the Essential Bus and turned off th= e=20 Master. Returning to the airport I had departed just 15 minutes before was=20= no=20 problem. In the pattern I was able to turn the master back on to power the=20 gear down and engage the flaps plus I still had about 8 gallons still in my=20= 9=20 gallon header. I would not have liked the situation to be more remote and a= t=20 night and in IMC. BTW, B&C claimed it was everything but the regulator -=20 miswired sense, resistance on the field, etc. I replaced the regulator and=20= all was=20 well. =20 Scott Krueger 2003 Air Venture Cup Racer #94 Sky2high@aol.com LNC2 N92EX IO320 Aurora, IL (KARR) -------------------------------1058610128 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en

In a message dated 7/18/2003 9:29:25 PM Central Daylight Time,=20 kycshann@kyol.net writes:

Wh= y would=20 you not know what has went wrong? =20 I guess I=E2=80=99m missing something here. =20 I guess we should evaluate the failure modes of the alternator. If it is overloaded or shorted, th= e ANL pops=20 and its disconnected. This occurs at about 80A on an ANL limiter correct? If the internals of the alternator=20= fails,=20 the circuit breaker pops the field and again, its= =20 dead. If an over/under/runawa= y voltage=20 condition occurs, the regulator gets it and shuts it down. If the regulator has failed, the a= lternator is dead=20 anyway because of not field. = If=20 the belt to the alternator breaks, no output.

Shannon,

There is another way. I had a circumstance where a failing voltag= e=20 regulator started to overcharge the battery. The regulator allowed the= =20 bus voltage to get to about 15.1 volts (12 volt system, 14.3 is the usual=20 running level) before the VM EPI 800 System flipped on one of my idiot=20= lights=20 (VOLTAGE). After pulling the field breaker, I switched on the Essentia= l=20 Bus and turned off the Master. Returning to the airport I had departed= =20 just 15 minutes before was no problem. In the pattern I was able to tu= rn=20 the master back on to power the gear down and engage the flaps plus I=20 still had about 8 gallons still in my 9 gallon header. I would not hav= e=20 liked the situation to be more remote and at night and in IMC. BTW,=20 B&C claimed it was everything but the regulator - miswired sense, resist= ance on=20 the field, etc. I replaced the regulator and all was well.

Scott=20 Krueger
2003 Air Venture Cup Racer #94
Sky2high@aol.com
LNC2 N92EX=20= IO320=20 Aurora, IL (KARR)

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