Matronics Email Lists :: View topic - Problem with Power Sources

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Problem with Power Sources

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

scc_ron(at)yahoo.com
Guest

Posted: Tue Aug 15, 2006 5:04 pm Post subject: Problem with Power Sources

I just finished my RV-4 and used Bob's Z-11 plan with a Battery Bus, Main Bus and E Bus. Somehow I have them isolated so that the main works of the Master, the E bus switch lights the avionics, but I can't get the Main bus to feed the E Bus without turning it on. 

   

  At first I thought I had miswired and blown the Diode, but I replaced that and still have the same squawk. The plane's electrical systems all work, but I wonder what I did wrong. I also wonder if I'm placing the whole system in jeopardy by using both switches to hot up everything. Appreciate any troubleshooting ideas.

  Ron

  RV-4 - 10 hours 

 [quote][b]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

fvalarm(at)rapidnet.net
Guest

Posted: Tue Aug 15, 2006 7:14 pm Post subject: Problem with Power Sources

Ron,

  

 I doubt that you have blown the diode.  I'm no expert  but have studied Bob's drawings and have them in front of me.  I must  assume that when you say "but I can't get the Main bus to feed the E Bus without turning it on",  "it " refers to the master switch.  If this is the case, it is working  correctly.  The master switch activates the main contactor which supplies  power to the main buss and then the e-buss via the diode.  If the e-buss is  not powering up in this scenario, I would check the orientation of the  diode.  Having it reversed is not going to hurt it, but it just won't pass  current to the e-buss components.

  

 When the master switch is turned on and the e-buss  alternate feed switch is turned off, use your voltmeter to look  for 12V at the diode, and then at the e-buss.  When taking these  readings, the negative lead of the voltmeter should be touching ground. You  should have 12V (give or take) at the diode and the e-buss.

  

 With master switch on, the e-buss can also get  power when the e-buss alternate feed switch is turned  on. 

  

 Bevan

 RV7A finish kit

  

  From:  owner-aeroelectric-list-server(at)matronics.com  [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Ron  Patterson

Sent: Tuesday, August 15, 2006 6:03 PM

To:  aeroelectric-list(at)matronics.com

Subject: Problem  with Power Sources

 

 I just finished my RV-4 and used Bob's Z-11 plan with a Battery Bus, Main  Bus and E Bus. Somehow I have them isolated so that the main works of the  Master, the E bus switch lights the avionics, but I can't get the Main bus to  feed the E Bus without turning it on. 

  

 At first I thought I had miswired and blown the Diode, but I replaced that  and still have the same squawk. The plane's electrical systems all work, but I  wonder what I did wrong. I also wonder if I'm placing the whole system in  jeopardy by using both switches to hot up everything. Appreciate any  troubleshooting ideas.

 Ron

 RV-4 - 10 hours 

[quote]



href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://wiki.matronics.com">http://wiki.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/contribution



[b]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

bicyclop(at)pacbell.net
Guest

Posted: Tue Aug 15, 2006 9:24 pm Post subject: Problem with Power Sources

You definitely want the e-buss to be fed through the diode from the main buss so that the e-buss switch isn’t a single point of failure.   

   

Hotting up everything shouldn’t cause any problems that I can see. On our RV, we have the Master and E-buss switches side by side and turn them both on every flight.  It saves having to remember to turn on the e-buss prior to offing the master. The way I see it, if the alternator quits, we just turn off the master and shed whatever loads we can spare from the e-buss. I’d hate to re-boot the Dynon, GPS and autopilot (potentially in IMC) just because I got the order wrong.  

   

Pax,  

   

Ed Holyoke  

   

   

--

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

nuckollsr(at)cox.net
Guest

Posted: Wed Aug 16, 2006 4:53 am Post subject: Problem with Power Sources

I agree with Ron, either the diode is bad (not the case since

a new one didn't fix it) or wired wrong which must now be our

working hypothesis. See:



http://www.aeroelectric.com/Pictures/Misc/s401-25.jpg



and check your wiring against the photo.



Bob . . .



At 08:12 PM 8/15/2006 -0700, you wrote:



 	  Quote: 	
		  Ron,



I doubt that you have blown the diode.  I'm no expert but have studied 

Bob's drawings and have them in front of me.  I must assume that when you 

say "but I can't get the Main bus to feed the E Bus without turning it 

on", "it " refers to the master switch.  If this is the case, it is 

working correctly.  The master switch activates the main contactor which 

supplies power to the main buss and then the e-buss via the diode.  If the 

e-buss is not powering up in this scenario, I would check the orientation 

of the diode.  Having it reversed is not going to hurt it, but it just 

won't pass current to the e-buss components.



When the master switch is turned on and the e-buss alternate feed switch 

is turned off, use your voltmeter to look for 12V at the diode, and then 

at the e-buss.  When taking these readings, the negative lead of the 

voltmeter should be touching ground. You should have 12V (give or take) at 

the diode and the e-buss.



With master switch on, the e-buss can also get power when the e-buss 

alternate feed switch is turned on.



Bevan

RV7A finish kit



  From: owner-aeroelectric-list-server(at)matronics.com 

 [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Ron 

 Patterson

Sent: Tuesday, August 15, 2006 6:03 PM

To: aeroelectric-list(at)matronics.com

Subject: Problem with Power Sources



I just finished my RV-4 and used Bob's Z-11 plan with a Battery Bus, Main 

Bus and E Bus. Somehow I have them isolated so that the main works of the 

Master, the E bus switch lights the avionics, but I can't get the Main bus 

to feed the E Bus without turning it on.



At first I thought I had miswired and blown the Diode, but I replaced that 

and still have the same squawk. The plane's electrical systems all work, 

but I wonder what I did wrong. I also wonder if I'm placing the whole 

system in jeopardy by using both switches to hot up everything. Appreciate 

any troubleshooting ideas.

Ron

RV-4 - 10 hours

 

<http://www.matronics.com/Navigator?AeroElectric-List>http://www.matronics.com/Navigator?AeroElectric-List

<http://www.matronics.com/contribution>http://www.matronics.com/contribution

-- incoming mail is certified Virus Free.

Checked by AVG Anti-Virus.


	




        Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Sat Aug 19, 2006 7:31 pm Post subject: Problem with Power Sources

On Aug 15, 2006, at 7:02 PM, Ron Patterson wrote:



 	  Quote: 	
		   I just finished my RV-4 and used Bob's Z-11 plan with a Battery  

 Bus, Main Bus and E Bus. Somehow I have them isolated so that the  

 main works of the Master, the E bus switch lights the avionics, but  

 I can't get the Main bus to feed the E Bus without turning it on.


	


You have probably wired the diode wrong. The main bus attaches to the  

'~' input (either one or both) and the e-bus connects to the '+' lead  

of the bridge. If you are using a regular diode (or preferably a  

schottky power diode) you wire it like this:



  main-bus ----->|----  e-bus



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

nuckollsr(at)cox.net
Guest

Posted: Thu Aug 24, 2006 7:00 pm Post subject: Problem with Power Sources

At 06:02 PM 8/15/2006 -0700, you wrote:



 	  Quote: 	
		  I just finished my RV-4 and used Bob's Z-11 plan with a Battery Bus, Main 

Bus and E Bus. Somehow I have them isolated so that the main works of the 

Master, the E bus switch lights the avionics, but I can't get the Main bus 

to feed the E Bus without turning it on.



At first I thought I had miswired and blown the Diode, but I replaced that 

and still have the same squawk. The plane's electrical systems all work, 

but I wonder what I did wrong. I also wonder if I'm placing the whole 

system in jeopardy by using both switches to hot up everything. Appreciate 

any troubleshooting ideas.

Ron


	


   Did you get this figured out okay?



   Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum