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diode vs guarded switch

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LarryRosen

Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ

Posted: Mon Jan 18, 2010 5:05 am Post subject: diode vs guarded switch

Bob Nuckolls

I am designing my dual alternator RV10 system, and would like your 

opinion. I am providing an alternate feed to the Ebus from a remote 

relay at the battery. I want this so I can power the Ebus for extended 

periods, to program the FMS before engine start, as well for abnormal 

inflight situations. I have planned an avionics bus relay to feed the 

avionics bus from the main. (I know your thoughts on this, but I want 

the ability to have all that stuff off for engine start). My design will 

have a guarded switch or diode to provide a back door to the main bus, 

thru the Ebus, and it's bus-tie breaker to the avionics bus. The guarded 

switch will give me the most control of this back door, as well as a 

backup to the avionics bus relay, but it'll cost me a voltage drop 

(shouldn't be an issue). The diode will allow the back flow without any 

pilot action, which has it's own merits. The ebus to avionics bus-tie 

breaker will be a lower value than the ebus feed breaker, to assure that 

if the alternate Ebus feed is over taxed by anything on the avionics, or 

main bus, it'll open and I'll still have power to the Ebus.

Would you suggest that I use a diode, or guarded switch for this function?

Thanks

Chris Hukill



*

*

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_________________
Larry Rosen
#40356
N205EN (reserved)
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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 18, 2010 7:59 am Post subject: diode vs guarded switch

At 06:55 AM 1/18/2010, you wrote:

 	  Quote: 	
		  





Bob Nuckolls

I am designing my dual alternator RV10 system, and would like your 

opinion. I am providing an alternate feed to the Ebus from a remote 

relay at the battery. I want this so I can power the Ebus for 

extended periods, to program the FMS before engine start, as well 

for abnormal inflight situations. I have planned an avionics bus 

relay to feed the avionics bus from the main. (I know your thoughts 

on this, but I want the ability to have all that stuff off for 

engine start). My design will have a guarded switch or diode to 

provide a back door to the main bus, thru the Ebus, and it's bus-tie 

breaker to the avionics bus. The guarded switch will give me the 

most control of this back door, as well as a backup to the avionics 

bus relay, but it'll cost me a voltage drop (shouldn't be an issue). 

The diode will allow the back flow without any pilot action, which 

has it's own merits. The ebus to avionics bus-tie breaker will be a 

lower value than the ebus feed breaker, to assure that if the 

alternate Ebus feed is over taxed by anything on the avionics, or 

main bus, it'll open and I'll still have power to the Ebus.

Would you suggest that I use a diode, or guarded switch for this function?


	


   Hmmmm . . . I'm in M.L. today and I thought I received

   and answered this question from Wichita yesterday or perhaps

   the day before. Check your inbox.



   Bob . . .

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