X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 01 Dec 2013 19:03:14 -0500 Message-ID: X-Original-Return-Path: Received: from nm7-vm0.bullet.mail.ne1.yahoo.com ([98.138.91.66] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with SMTP id 6621337 for lml@lancaironline.net; Sun, 01 Dec 2013 16:29:33 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.91.66; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.100.111] by nm7.bullet.mail.ne1.yahoo.com with NNFMP; 01 Dec 2013 21:28:59 -0000 Received: from [98.138.84.39] by tm100.bullet.mail.ne1.yahoo.com with NNFMP; 01 Dec 2013 21:28:59 -0000 Received: from [127.0.0.1] by smtp107.mail.ne1.yahoo.com with NNFMP; 01 Dec 2013 21:28:59 -0000 X-Yahoo-Newman-Id: 280900.52061.bm@smtp107.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: GCOgMTQVM1klmI2R4Excy1YKcNwypCsjkMZ1ILG9wYwZpxy SCX1rfP4M3XGbNbhzm9PGy7.Z7q6FpA1Q_xMU0dnaWtSBcmUuZ5g.U7pHOfZ cU6NXAYT.sjUoCpoGQHo3cgmlytkqf77if6kq0ZB22M5nQW61y3bkM3pkh.t eQTkGUaIDWlPVrd2NU.YmiFy9mGumj0FDczzgkFyzUa_TqAT9a5JCXjw7qYf cK2qgSL35L7GddR5HNMpzYnHY5cti0x9o.28ctm.yyp7VfdeG1suUhSyryHS EvQ0Ynn4pzUspf6HVk_UpBZNLrOKJAtQPI5murzKhVmOdWki5hGwUpu1frVj BtpiD4flTImsihwicBL.K4hENA.XUYtHp7lRxIEfmj10GDBr2vrxiExSqAsj nj6C3k0KWoapqFxWdQvCC3dI.F17NH27aDiHSgNy1Z0_otJiuL_UjtlR5w1V xa6qvbjDCZkyKXy.fNwCNt56w5uTaj7RSUf_AQ.u7IF0TzZLpO4A._Ka.H_A fD_9Q8XGM9Tve_RpSB9.QvASI6C5sY7tyUTHiT78VzwZQhHYXXV_AzYLOUGQ lZYl1c0d0HbmFMf0g8n2saFNedTlzH1ixmYIJrDTw524rRmvq4ukV3QAat.9 AOevqg22ItU4WsCEBhFtPHEbJGTSwf.2d.RZgKi0Tu810l5LAJ.uyQwIoWCT c6KJDkknOYQj1dN8- X-Yahoo-SMTP: 076hgjCswBC.G6e0vm7vgvZ9JJ0zmeBo_Oyw X-Rocket-Received: from [192.168.1.65] (chris_zavatson@172.14.16.72 with ) by smtp107.mail.ne1.yahoo.com with SMTP; 01 Dec 2013 13:28:59 -0800 PST Subject: Re: [LML] Re: [LNC2] Oildyne Hydraulic Pump Inrush References: From: Chris Zavatston Content-Type: multipart/alternative; boundary=Apple-Mail-D60B0072-FDA0-4890-AEF1-53FAB06704B2 X-Mailer: iPhone Mail (9A405) In-Reply-To: X-Original-Message-Id: <411BE78E-A4FA-49BC-B002-34B0133B669E@yahoo.com> X-Original-Date: Sun, 1 Dec 2013 13:28:55 -0800 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-D60B0072-FDA0-4890-AEF1-53FAB06704B2 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Is see I had a typo in the units. Vertical scale as shown is 50mV/division. The shunt used is 30A/50mV The peak is therefore ~160 A. Chris Sent from my spiffy iPhone On Dec 1, 2013, at 12:30 PM, Colyn Case wrote: > Chris, say again the vertical scale? 30A/division !=3D 50ma > How much is a tick mark? > On Dec 1, 2013, at 9:36 AM, Chris Zavatson wrote: >=20 > FWIW, attached are some screen shots of the pump running a single cylinder= . The vertical scale is 30A / division or 50ma. And just for kicks, the sh= ot with two steady state levels is the pump running up against the pressure r= elief valve. > =20 > Chris Zavatson > N91CZ > 360std > http://www.n91cz.net/ >=20 >=20 > On Thursday, November 28, 2013 6:24 PM, Colyn Case wrote: > good info. thanks! >=20 > On Nov 28, 2013, at 4:56 PM, John Cooper wrote: >=20 > Today I inserted a 75A / 50mV shunt in the power lead to my hydraulic pump= in order to measure the current draw. I connected my Fluke 87-V digital vol= tmeter on the 600mV range across the sense terminals of the shunt . With the= pump running in the "gear down" direction and the equalization valve open, t= he motor was drawing a steady 29 Amps. I then shut off the pump, closed the e= qualization valve, and with the Fluke in the "250 uS peak" mode, measured th= e inrush when the pump started up again briefly. Would you believe 135 Amps!= (Disclaimer: I purchased the shunt on eBay and can't vouch for its calibra= tion.) >=20 > Next time the plane is up on jacks, I'll re-do this test in both gear up a= nd gear down directions. Also, I intend to temporarily remove the ZNRs acros= s the hydraulic relay contacts and measure the voltage spikes with no prote= ction. >=20 >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l >=20 >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l >=20 --Apple-Mail-D60B0072-FDA0-4890-AEF1-53FAB06704B2 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Is see I had a typo in the= units.
Vertical scale as shown is 50mV/division.
The sh= unt used is 30A/50mV
The peak is therefore ~160 A.
Chris=

Sent from my spiffy iPhone

On Dec 1, 2013, at 1= 2:30 PM, Colyn Case <colyncase= @earthlink.net> wrote:

Chris, say again the vertical scale?    30A/division !=3D= 50ma
How much is a tick mark?
On Dec 1, 2013, at 9:36 AM, C= hris Zavatson wrote:

FWIW, attached are some screen s= hots of the pump running a single cylinder.  The vertical scale is 30A /= division or 50ma.  And just for kicks, the shot with two steady state l= evels is the pump running up against the pressure relief valve.
=
 
Chris Zavatson
N91CZ
360std


On Thursday, November 28, 2013 6:24 PM, Colyn Case <colyncase@earthlink.net= > wrote:
good info= .  thanks!

On Nov 28, 2013, at 4:56 PM, John Cooper wrote:
Today I inserted a 75A / 50mV shunt in the power lead to my hydraulic pump= in order to measure the current draw. I connected my Fluke 87-V digital vol= tmeter on the 600mV range across the sense terminals of the shunt . With the= pump running in the "gear down" direction and the equalization valve open, t= he motor was drawing a steady 29 Amps. I then shut off the pump, closed the e= qualization valve, and with the Fluke in the "250 uS peak" mode, measured th= e inrush when the pump started up again briefly. Would you believe 135 Amps!=   (Disclaimer: I purchased the shunt on eBay and can't vouch for its ca= libration.)

Next time the plane is up on jacks, I'll re-do this test i= n both gear up and gear down directions. Also, I intend to temporarily remov= e the ZNRs across the hydraulic relay contacts and measure the voltage spikes with no protection.=


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