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Grnd Pwr Jack

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frank.phyllis(at)mindspri
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Posted: Mon Nov 20, 2006 6:15 am Post subject: Grnd Pwr Jack

Not sure I've properly installed the Ground Power Jack per the diagram

from Bob.  I'm wondering if I have the circuit breaker switch properly

connected--which terminal goes to the ground ("Line" or "Load") & which

goes to the contactor?

When I connect power to the plug the test light comes on, regardless of

which position the circuit breaker switch is in.  Is this what's

supposed to happen?  I am thinking that I should be able to test the

ground pwr contactor to see if it's closed by testing the voltage across

the terminals but I don't get the voltage I expect (~ 12 v?).  I'm using

a Schumacher Model WM-1562A "Fully Automatic Battery Charger/Maintainer"

(1.5 amp slow charge)when I test the system.

Frank McD

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nuckollsr(at)cox.net
Guest

Posted: Mon Nov 20, 2006 6:44 am Post subject: Grnd Pwr Jack

At 09:13 AM 11/20/2006 -0500, you wrote:



 	  Quote: 	
		  



Not sure I've properly installed the Ground Power Jack per the diagram

from Bob.  I'm wondering if I have the circuit breaker switch properly

connected--which terminal goes to the ground ("Line" or "Load") & which

goes to the contactor?

When I connect power to the plug the test light comes on, regardless of

which position the circuit breaker switch is in.  Is this what's

supposed to happen?  I am thinking that I should be able to test the

ground pwr contactor to see if it's closed by testing the voltage across

the terminals but I don't get the voltage I expect (~ 12 v?).  I'm using

a Schumacher Model WM-1562A "Fully Automatic Battery Charger/Maintainer"

(1.5 amp slow charge)when I test the system.


	




   There are several ground power wiring options in the

   literature I've published. Since you speak of a light

   then I presume you're referring to the drawing shown

   in . . .



   http://aeroelectric.com/articles/grndpwr.pdf



   The symptoms you describe suggest that the light

   fixture is wired wrong. There are three terminals

   on the back that must be wired as depicted or

   you'll get unpredictable behavior which includes

   the symptoms you've described.



   I don't think the WM1562 charger is appropriate to

   simulate a ground power source. This charger is of

   limited output current . . . about 1 amp as I recall

   and the ground power contactor needs about 0.7 of

   the total. It MIGHT work but without trying it

   or doing more detailed analysis of the charger's

   expected behavior, I cannot predict.



   When you connect a ground power source (try a battery

   with a 10A fuse in the line), the indicator lamp should

   be dark as long as the breaker-switch is open. Pressing

   the fixture should produce a light showing that ground

   power is applied and that the lamp is good. Closing

   the breaker should also cause the contactor to close.

   This will happen with a audible "thunk". The light

   will come on also showing that ground power is now

   applied to ship's wiring.



   A reversed ground power source will cause the switch

   breaker to open immediately after you try to close it.

   Likewise, if you've installed the over voltage protection

   option, applying 24v to a 12v airplane will also cause the

   switch=breaker to open.



   Bob . . .

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frank.phyllis(at)mindspri
Guest

Posted: Thu Nov 23, 2006 7:09 am Post subject: Grnd Pwr Jack

Thanks for your note, Bob.

I rechecked my connections (again) and now it works like a champ--just

as you described.

FYI, the described charger below does work with the circuit.

Hope you're Thanksgiving is a blessed one.

Frank McD 



--

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nuckollsr(at)cox.net
Guest

Posted: Thu Nov 23, 2006 7:38 am Post subject: Grnd Pwr Jack

At 10:08 AM 11/23/2006 -0500, you wrote:



 	  Quote: 	
		  



Thanks for your note, Bob.

I rechecked my connections (again) and now it works like a champ--just

as you described.


	


   I'm pleased that the solution was simple.



 	  Quote: 	
		  FYI, the described charger below does work with the circuit.


	


   Good data point. Thanks! I have a couple of those

   on the shelf for use in the shop but I've never

   explored their behavior as utility power sources.



   I did explore their behavior as battery chargers

   and posted the data at:



http://www.aeroelectric.com/Pictures/Curves/schumacher_2.jpg

http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg

http://www.aeroelectric.com/Pictures/Curves/schumacher_4.jpg

   These curves confirm the manner in which these devices

   "top off" a battery and then drop to support terminal

   voltage a some point well below charging potentials but

   high enough to make the charger assume the loads of all

   leakage currents.



 	  Quote: 	
		  Hope you're Thanksgiving is a blessed one.


	


   Thank you sir!  I'm off to Medicine Lodge to pick

   up my hospitalized father for transport out to Uncle

   George and Aunt Sally's for the day over in Leon, KS.

   We're expecting 40 folks to show up and the weather is

   clear, relatively calm and 70 degrees. All in all, the

   prospects for a great day are in place.



   Bob . . .

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