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05-09-2019, 06:11 PM
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Join Date: May 2012
Location: Los Angeles Coast
Posts: 65
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LANDING CHECKLIST PMAG EXTERNAL POWER ON
If you are running dual PMAG's or any kind of all electronic ignition your landing checklist should include the PMAG external power verified ON.
GUMPS check when you get to Switches would be a good time to verify that the external power is ON prior to the engine RPM getting low for landing. Remember the PMAG runs on internal power until the RPM gets too low, and then it switches to EXTERNAL POWER or DIES if the power is OFF.
I have connected both PMAG external power circuits to the Dynon EFIS which monitors the voltage and produces an aural and visual alarm if it is OFF.
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RV-9A with NEW LYCOMING O-320-D2G with Roller Lifters
Catto 2 blade propeller
Dual PMAG with EI Commander
Dual Dynon HDX, Garmin GTN 650Xi
Dual PlanePower Alternators
Based at Santa Monica CA. The Socialist City Airport
Over 1,000 hours of Exploration and Bliss
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05-09-2019, 06:49 PM
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Join Date: Aug 2011
Location: Jeffersonville, IN
Posts: 393
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Quote:
Originally Posted by BMW_X6M
I have connected both PMAG external power circuits to the Dynon EFIS which monitors the voltage and produces an aural and visual alarm if it is OFF.
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I assume you used one of the extra inputs to do this. Did you then change the configuration inside Dynon to tell it that it was a voltage monitor and what it was for so the screen displayed that info?
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Jeff Scott
RV9A First Flight 9/30/19
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05-09-2019, 06:50 PM
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Join Date: Jan 2013
Location: D.C.
Posts: 303
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How would one successfully start a dual pmag setup without at least one mag powered? Do you routinely turn power off to one or more p mags in flight? I love checks as much as the next guy, but this seems a bit excessive.
Maybe I'm missing something, my wife would say that's pretty common...
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Paul M.
Fayetteville, NC
Airport Bum
RV-4 / PA28-180
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05-09-2019, 09:31 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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I have a miniature toggle switch for the PMAG power. They can easily be flipped to the off position by mistake, if your hand accidently hit them. For that reason, I have installed a LED that will come on if the power is turned off. That is for my sanity check.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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05-10-2019, 01:40 AM
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Join Date: May 2012
Location: Los Angeles Coast
Posts: 65
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Quote:
Originally Posted by ty1295
I assume you used one of the extra inputs to do this. Did you then change the configuration inside Dynon to tell it that it was a voltage monitor and what it was for so the screen displayed that info?
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Actually I described it incorrectly. DYNON is looking for a ground on the contact inputs, so I used two small relays. When de-energized they produce the ground for the contact inputs. The screen shows indicator lights.
__________________
RV-9A with NEW LYCOMING O-320-D2G with Roller Lifters
Catto 2 blade propeller
Dual PMAG with EI Commander
Dual Dynon HDX, Garmin GTN 650Xi
Dual PlanePower Alternators
Based at Santa Monica CA. The Socialist City Airport
Over 1,000 hours of Exploration and Bliss
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05-10-2019, 05:11 AM
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Join Date: Oct 2009
Location: Sydney, Aust.
Posts: 820
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Quote:
Originally Posted by BMW_X6M
Actually I described it incorrectly. DYNON is looking for a ground on the contact inputs, so I used two small relays. When de-energized they produce the ground for the contact inputs. The screen shows indicator lights.
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Not necessarily. It depends how you configure your color ranges.
I connected two inputs to the Pmag power inputs at the PMag itself. 0-4.5V = Red (Problem). 4.5V-5.0V = Green(OK). You can put 14V into a 5V input without damaging the EMS module, according to Dynon.
According to EMagAir, you supposedly cannot measure PMag internal voltage with an external voltmeter when the PMag is running because it is diode-isolated, but the Dynon doesn't lie. I can turn ships power off to the PMags in flight and the Dynon reports >4.5V on the PMag power pin. I am guessing it is similar to the VP-X installation manual caution, that notes you will observe close-to-bus voltage on a VP-X power pin that is "OFF" if measured with a voltmeter, but apply any kind of load, and it will show 0V.
EDIT: Apologies, BMW, you clearly stated contact inputs. I used GP inputs for my PMag power inputs.
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Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci
My Flickr gallery: http://www.flickr.com/photos/35521362@N06/
RV-9A - Finished on 10th February 2016 after 4 years, 9 months and 19 days! The 1020th RV-9 flying.
First flight 26th March 2016. Essential specs 145KTAS @ 2400RPM, 8000', 24.2LPH, Initial RoC 1800FPM.
Last edited by KRviator : 05-10-2019 at 05:16 AM.
Reason: Realised BMW_X6M referred to contact, not GP inputs...
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05-10-2019, 12:21 PM
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Join Date: Feb 2011
Location: Germany
Posts: 443
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I once forgot to switch Ign Pwr back on after runup and didn?t read my T/O checklist thorough enough. So after a normal flight the engine stopped on rollout after landing.
I have Ign Pwr in the T/O checklist and Abnormal Checklist. May be a warning light is a good idea as well.
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RV-7 flying, IO-375 w. P-Mags, 200RV Prop
RV-8 flying, IO-375, P-Mags, 74RV Prop
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05-10-2019, 01:57 PM
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Join Date: Apr 2008
Location: Catawba, NC
Posts: 193
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monemtary switches
I just used a 3 position switch, bottom: grounded and powered, center:ungrounded and powered, and top:momentary ungrounded and unpowered. Can't stay in the momentary position unless you hold it there
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mangling aluminum since May 2009
RV7-A, flying
RV8 under construction
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05-10-2019, 04:18 PM
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Join Date: Feb 2007
Location: Dallas, TX
Posts: 365
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Quote:
Originally Posted by engineerorange
I just used a 3 position switch, bottom: grounded and powered, center:ungrounded and powered, and top:momentary ungrounded and unpowered. Can't stay in the momentary position unless you hold it there
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Same here. 600+ hours with this setup.
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Jeff Atkinson
RV-8 #82594 Flying since May 2012
Barrett XP-360, Catto 3-Blade, Dual G3X Touch, GTN-650, VP-X
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05-10-2019, 05:13 PM
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Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,558
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Mine is exactly like engineerorange too. Both Pmags powered through pullable circuit breakers, which stay in unless I?m checking them a couple times per year. I check the momentary position (ships power off) on every takeoff when above 1000 RPM. If ships power failed in flight, I wouldn?t know it until I turned off the runway and RPM dropped below about 750 RPM.
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SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
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