X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 18 Feb 2013 23:21:20 -0500 Message-ID: X-Original-Return-Path: Received: from nm27-vm0.access.bullet.mail.mud.yahoo.com ([66.94.236.227] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6070883 for lml@lancaironline.net; Mon, 18 Feb 2013 23:07:34 -0500 Received-SPF: neutral receiver=logan.com; client-ip=66.94.236.227; envelope-from=browncc1@verizon.net Received: from [66.94.237.193] by nm27.access.bullet.mail.mud.yahoo.com with NNFMP; 19 Feb 2013 04:06:59 -0000 Received: from [98.138.85.46] by tm4.access.bullet.mail.mud.yahoo.com with NNFMP; 19 Feb 2013 04:06:59 -0000 Received: from [127.0.0.1] by smtp103.vzn.mail.ne1.yahoo.com with NNFMP; 19 Feb 2013 04:06:59 -0000 X-Yahoo-Newman-Id: 750540.31720.bm@smtp103.vzn.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: qwzy72gVM1kn.YDnD6LJtA02cIk735KS1yeZn9Xf_fWHg4i n0gf5nC2h2f1n3GF6Nf_WWrQhWZ_3kayO.dqQacCqKp85sxZArl705KYhZxE 43sjvwVS4mFOkLWcXV14idmheEa9U5BeMMYNbrwCIifU5l97Z2fybH5w2uzc 1vbmDoLC9rdrpzz5ciq8Wrz.3a8VTFFc0NdQAawLqutL4KsHOz2rOBsvYj2b QfZrE7_zUBS_B_G4e5.8RIwJ5vpJzmN_7GGlfHqMaG8JexP9.FCr4JrdzQLW RzuyS0eNkEjlE1OTVaXuip3CRwNDqRVDB662plF8b6OprQHiya5c9zt64bcB mBy1eGybN7gSAXM2otWCz.9sF3F9B1Lj3ECwt9rqdPIom7ZUCIKtfAg5E0wz btmh.Smh5d5mkIwcDuxYNBUTzox5UgfK7A6onmkpG.Y1zG6pDS2fhugUEmu5 ve4q9X7blY5KmqHHBmEuMBT4facc- X-Yahoo-SMTP: F49l9g6swBC0R9n8vJIbm7Tf3P8Xlmia8rHIwTlO__Ml Received: from chass-imac-2.home (browncc1@72.64.105.53 with plain) by smtp103.vzn.mail.ne1.yahoo.com with SMTP; 19 Feb 2013 04:06:59 +0000 UTC From: Charles Brown Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-2-687528596 Subject: Re: [LML] Strobe draw. X-Original-Date: Mon, 18 Feb 2013 22:06:57 -0600 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <8852F189-C2C5-4FA7-B157-F4DF6BCE0E7A@verizon.net> X-Mailer: Apple Mail (2.1085) --Apple-Mail-2-687528596 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Thanks Jack. Your data tracks other respondents'.=20 I spoke to Bill Bainbridge, owner of B&C Electronics who builds the = regulators that I use. He suggested that most likely culprits affecting = my Reg 2 are resistance at the alternator 2 field connector, and = resistance in the voltage sense line. I will check these out and will = also adjust my Reg 2 voltage down to 26. Somehow it crept up to 28, or = was set there originally, I'm not sure. CB On Feb 18, 2013, at 7:12 AM, Jack Morgan wrote: Hi Charlie, The strobe power supply does draw power cyclically in sync with the = strobe flashes. The inverter runs continuously drawing low power after = charging the strobe energy capacitors and higher power during the = recharge interval. This is a relatively small fluctuation and is = partially filtered by the strobe power supply to insure it doesn't = radiate and upset radio reception. It does show up as current = fluctuation in my G900 but will not damage an alternator regulator. The = autopilot has a similar current fluctuation depending on how much the = servos need to work in rougher air. Same filtering needed in the = autopilot controller and again not big enough to damage anything in the = charging system. Current fluctuations of any magnitude should not damage the charging = system.... think hydraulic pump or A/C compressor cycling. I would look = at the back up alternator's controller to isolate why it is kicking in. Hope this helps. Jack Morgan On Feb 18, 2013, at 6:03 AM, Lancair Mailing List wrote: > From: Charles Brown > Subject: strobe light power draw > Date: February 17, 2013 2:16:22 PM EST > To: lml@lancaironline.net >=20 >=20 > Amigos,=20 >=20 > My 24V strobe light systems draws 3-4 amps like Whelen says it should, = but seems to do it cyclically, i.e., a 0-4 amp sine wave with period = equal to the flash rate (about 3 sec). Can anyone tell me if that is = normal, or should it be a steady 3-4 amp draw? (12V guys, same question = only 12V Whelen strobes should pull around 7 amps) >=20 > < I ask because it's making prime alternator amps cycle up and down; = bus voltage cycle up and down, only about 0.1V; but it may be related to = the demise of two successive regulators for the backup alternator, which = starts kicking in at 3-sec intervals, with loud "BONG" alerts from the = Garmin. You are invited to enjoy the mental spectacle of the Garmin = BONGING me into insanity while I hurl epithets at the instrument panel = as I alternately shut off ALT 1, then ALT 2, then both, trying to figure = this out when I SHOULD be sitting back, smoking a stogie, and watching = the Texas hill country scenery slide by. PS -- Alternator one regulator = checks out good with good ground and power paths etc > >=20 > Charley --Apple-Mail-2-687528596 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii
Hi = Charlie,

The strobe power supply does draw power = cyclically in sync with the strobe flashes. The inverter runs = continuously drawing low power after charging the strobe energy = capacitors and higher power during the recharge interval. This is a = relatively small fluctuation and is partially filtered by the strobe = power supply to insure it doesn't radiate and upset radio reception. It = does show up as current fluctuation in my G900 but will not damage an = alternator regulator. The autopilot has a similar current fluctuation = depending on how much the servos need to work in rougher air. Same = filtering needed in the autopilot controller and again not big enough to = damage anything in the charging system.

Current = fluctuations of any magnitude should not damage the charging system.... = think hydraulic pump or A/C compressor cycling. I would look at the back = up alternator's controller to isolate why it is kicking = in.

Hope this = helps.

Jack Morgan

On = Feb 18, 2013, at 6:03 AM, Lancair Mailing List wrote:

From: Charles Brown = <Subject: strobe light = power draw
To:  

My 24V strobe light = systems draws 3-4 amps like Whelen says it should, but seems to do it = cyclically, i.e., a 0-4 amp sine wave with period equal to the flash = rate (about 3 sec).  Can anyone tell me if that is normal, or = should it be a steady 3-4 amp draw?  (12V guys, same question only = 12V Whelen strobes should pull around 7 amps)

< I ask because = it's making prime alternator amps cycle up and down; bus voltage cycle = up and down, only about 0.1V; but it may be related to the demise of two = successive regulators for the backup alternator, which starts kicking in = at 3-sec intervals, with loud "BONG" alerts from the Garmin.  You = are invited to enjoy the mental spectacle of the Garmin BONGING me into = insanity while I hurl epithets at the instrument panel as I alternately = shut off ALT 1, then ALT 2, then both, trying to figure this out when I = SHOULD be sitting back, smoking a stogie, and watching the Texas hill = country scenery slide by. PS -- Alternator one regulator checks out good = with good ground and power paths etc = >

Charley


= --Apple-Mail-2-687528596--