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  #11  
Old 06-18-2017, 03:49 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by Tommycat View Post

See Van's RV-12 D-180 schematic download HERE.
So, I'm looking at the schematic you reference and it still shows the diode on the load side and not the battery side. The schematic included in Van's digital files also shows diode on load side. My diode is on the battery side. Now I'm confused.

This image per TC's reference...
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My diode installed like like van's instructions...
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 315

Last edited by Piper J3 : 06-18-2017 at 04:13 PM.
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  #12  
Old 06-18-2017, 04:00 PM
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Update... I have now looked at the AV Control Board 12 and it appears unharmed. From what I can see with bright light and magnifying glasses, no burnt components or foil tracings. Master switch has continuity to pins 21 & 22 on the FW FWD FPCB connector. Master Switch contacts are working.

So, the plan right now is to install new Master Relay from Van's with new diode (proper install still TBD) and then pull fuses and try to power up the Master.
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 315
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  #13  
Old 06-18-2017, 04:46 PM
Mich48041 Mich48041 is offline
 
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Jim, you are correct about Van's schematic showing the diode on the load side. However, the schematic is WRONG. Take a look at plans page 45A-08. It shows the diode on the battery side. Arc suppression diodes are connected across coils. The coil inside of the contactor is connected to the battery side, NOT the load side.
I have faxed a Builder Feedback Form to Van's pointing out this error.
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  #14  
Old 06-18-2017, 05:02 PM
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Piper J3 Piper J3 is offline
 
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Excellent Joe, new diode will be installed on battery side. I hope new Master Relay solves my problem. I'm planning initial power-up so minimum number of items will be connected to the buss. I'd really like to see just the Master Relay energize all by itself and then gradually add loads back on.
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 315
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  #15  
Old 06-18-2017, 05:51 PM
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Tony_T Tony_T is offline
 
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Default Another data point

The ES Diode Master is shown on the battery side on the SkyView Schematic.



D-180 guys please ignore the ES-00165 starter relay diode shown in this picture as it exists in the control board on the D-180 panel.
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  #16  
Old 06-18-2017, 06:47 PM
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Tommycat Tommycat is offline
 
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Sorry fellas,
I was not trying to create more confusion... Only pointing out that I thought the downloaded version of the wiring diagram was wrong and incomplete. And that Jim would be confused if using it as I was troubleshooting from it. Didn't know the flash version was inaccurate too. Thanks Joe for reporting it. If I run across errors again I know what route to take.

That said the schematics disclaimer instructs as to what information has precedence...



But it would be nice to be all on the same page.


Glad to hear the board is sound.

Regards,
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Last edited by Tommycat : 06-19-2017 at 08:13 AM.
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  #17  
Old 06-19-2017, 01:14 PM
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Further update... I tested the Master Relay today and definitely find it broken. I disconnected the load side and then shorted the coil terminal to ground and nothing happens. Coil should have pulled in. So now I wait for Van's delivery of the the new Relay and Diode.

Things starting to make sense.
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 315
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  #18  
Old 06-20-2017, 09:13 AM
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Piper J3 Piper J3 is offline
 
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Update 9-20-17.... Today I removed the Master Relay in anticipation that Van's replacement part will be delivered either tomorrow or day after. Not the easiest thing to remove with engine mount and hoses in the way. For those that carry spare fuel pumps, etc. on long journeys you might want to stock this part as well. This is exact replacement PN http://www.ebay.com/itm/COH24115-BX-...72.m2749.l2649

$23.75 incl shipping.
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 315

Last edited by Piper J3 : 06-20-2017 at 09:16 AM.
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  #19  
Old 06-20-2017, 10:53 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Default Additional data point......

Quote:
Originally Posted by Piper J3 View Post
For those that carry spare fuel pumps, etc. on long journeys you might want to stock this part as well.
Vans has been selling and using this exact same part for 25+ years.
Based on the information I have, it has had a very low failure rate (I have personally never change one and I work on a lot of different RV's).
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RV-6A (aka "Junkyard Special ")
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  #20  
Old 06-20-2017, 11:16 AM
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Piper J3 Piper J3 is offline
 
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Thanks for chiming in Scott. Always appreciate your viewpoint and assistance…

Here’s my theory of the failure: I believe the Master Relay opened in flight and voltage regulator then lost its reference voltage. This caused VR to go full output thinking battery voltage was low. Perhaps the Master Relay re-energized when I throttled back for landing (warning stopped when I throttled back). This allowed elevator trim to work in the landing pattern and also allowed trim to be reset as I taxied in. Once I shut off the engine the Master Relay would not pull in again from that point on.
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 315
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