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Jabiru regulator wiring and 2nd ground

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Tue Nov 03, 2009 6:54 pm Post subject: Jabiru regulator wiring and 2nd ground

Hi!



I am mounting my filter capacitor and alt disconnect relay on the cool side of the firewall. Voltage regulator and battery would be FWF. One alternator lead would go through the firewall to the COM terminal of the alt disconnect relay.  From the regulator, one ltblu wire, the red wire, and the yel wire would go through the firewall to the filter capacitor. From the filter capacitor, there would be one wire come back through the firewall to the starter contactor. This is how I'd planned it a few months ago. The only changes were to downsize the wires.



But today, I ran across the following on the US Jabiru website:



We suggest keeping the red and yellow wires ahead of the firewall.  We run them directly but separately to the battery.  



This differs from how I have it, since my red and yellow wires are not kept fwf. And they are not run directly to the battery, but go first to the filter capacitor, starter contactor, battery contactor and then to the battery. Is there any problem doing it how I have it?

I also noticed in the Z drawings with the Jabiru regulator, Bob shows two grounds, one from the black wire and another drawn between the voltage regulator box to the firewall. I'm wondering if this ground drawing should be deleted. The voltage regulator metal case certainly contacts the firewall, fwiw.

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nuckolls.bob(at)aeroelect
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Posted: Wed Nov 04, 2009 6:59 am Post subject: Jabiru regulator wiring and 2nd ground

At 08:54 PM 11/3/2009, you wrote:

 	  Quote: 	
		  



Hi!



I am mounting my filter capacitor and alt disconnect relay on the 

cool side of the firewall. Voltage regulator and battery would be 

FWF. One alternator lead would go through the firewall to the COM 

terminal of the alt disconnect relay.  From the regulator, one ltblu 

wire, the red wire, and the yel wire would go through the firewall 

to the filter capacitor. From the filter capacitor, there would be 

one wire come back through the firewall to the starter contactor. 

This is how I'd planned it a few months ago. The only changes were 

to downsize the wires.



But today, I ran across the following on the US Jabiru website:



We suggest keeping the red and yellow wires ahead of the 

firewall.  We run them directly but separately to the battery.



This differs from how I have it, since my red and yellow wires are 

not kept fwf. And they are not run directly to the battery, but go 

first to the filter capacitor, starter contactor, battery contactor 

and then to the battery. Is there any problem doing it how I have it?

I also noticed in the Z drawings with the Jabiru regulator, Bob 

shows two grounds, one from the black wire and another drawn between 

the voltage regulator box to the firewall. I'm wondering if this 

ground drawing should be deleted.


	


    It depends on the specific regulators . . . some regulators

    require an electrical case ground for proper function

    so I always show it . . . if the critter is mounted to your

    conductive firewall, then it IS grounded whether electrically

    necessary or not.



 	  Quote: 	
		    The voltage regulator metal case certainly contacts the firewall, fwiw.


	


    Yes . . . that's what that symbol is about.



   You're mixing multiple recipes for success together

   with predicable consternation. There's no good reason to

   have just the relay and filter capacitor on the

   cockpit side of the firewall. Good practice calls

   for minimizing firewall penetrations.



   If it were my airplane, I'd put all the alternator

   stuff forward of the firewall and bring a

   minimum of power distribution and control wires

   through to the cockpit.

        Bob . . .



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

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Wed Nov 04, 2009 9:17 am Post subject: Re: Jabiru regulator wiring and 2nd ground

 	  Quote: 	
		  You're mixing multiple recipes for success together 

with predicable consternation. There's no good reason to 

have just the relay and filter capacitor on the 

cockpit side of the firewall. Good practice calls 

for minimizing firewall penetrations. 



If it were my airplane, I'd put all the alternator 

stuff forward of the firewall and bring a 

minimum of power distribution and control wires 

through to the cockpit. 	




I could certainly do that. The main reason I planned on putting them in the cabin was because that's where the documentation for the relay and capacitor said to put them. "Regulator and capacitor should be mounted in a cool place and should be mounted on the cockpit side of the firewall" The diagram shows the battery, alt disconnect relay, capacitor and voltage regulator behind the firewall. Of these, only the battery has a fixed position fwf in a Sonex. I had planned to put the regulator fwf mainly because that's where Jabiru has it.



As it's drawn now in my schematic, I have 5 wires going through the firewall between the regulator, relay, and capacitor. Moving the regulator into the cabin would cut that down to 3: the 2 alternator leads and the single wire from the capacitor to the starter contactor.



Or I could mount all of these components fwf, which would eliminate all the firewall penetrations shown and add just the 22awg alt relay coil wire going fwf.



It sounds like this latter way is how you would do it, which means less firewall penetrations would trump having these components in the cooler cabin.

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