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Help-- High Voltage?

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Tom O'Hara

Joined: 26 Jan 2006
Posts: 34

Posted: Mon Apr 23, 2007 9:25 am Post subject: Help-- High Voltage?

First, let me say that I am a buyer/flyer not a builder/flyer.  Purchased a MKIII a year and a half ago and have been having a ball. I believe it is the first one out of the TN plant.



Saturday I went out for a flight and had an EIS warning light come on--- voltage.  Currently the EIS is set for 11.2 to 14.6 volts acceptable range.  I was running 16.2 to 17.4.



Are the set points correct?

Where should I start trouble shooting?

What are the consequences of the high voltage?

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by0ung(at)brigham.net
Guest

Posted: Mon Apr 23, 2007 9:59 am Post subject: Help-- High Voltage?

Saturday I went out for a flight and had an EIS warning light come on---

voltage.  Currently the EIS is set for 11.2 to 14.6 volts acceptable range.

I was running 16.2 to 17.4.



Are the set points correct?

Where should I start trouble shooting?

What are the consequences of the high voltage?



I think I would set the lower range to 11.8V  the 14.6 seems ok.  Lead acid

batteries are considered discharged at 11.8 V 



If you are running 16.2 to 17.4  the first thing I would do is compare it to

another volt meter,   if it is still that high I would check the battery, or

the voltage regulator/ rectifier.   I would compare the voltage without

starting up the engine... no need of having the last test be the one to let

the smoke out.

 

 You do know about the smoke don't you,,,,,   the factory fills all

electronics with smoke before they sell them....  if you let the smoke out

they quit working.  

 the consequences of the high voltage could include smoking  the eis,  that

would be an expensive puff of smoke,,,   it could also damage radios, gps,

etc,  if they are using onboard power.  It could even destroy the battery by

over charging it and boiling out the electrolyte.



Mine has always read 13.8 while running.

[Boyd]

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Apr 23, 2007 11:16 am Post subject: Re: Help-- High Voltage?

You ought to check your regulator/rectifier. High voltage is what happens when it goes out. Easy to replace. High voltage can damage instruments, 

radios and batteries. They are not expensive and it stands a high probability for the cause. I wouldn't fly it or run it any more than you have to until it's fixed.

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Mon Apr 23, 2007 11:19 am Post subject: Help-- High Voltage?

11.2 to 14.6 would be a good normal.

As far as trouble shooting, what engine are you running? What 

regulator/rectifier? Can't second guess the unknown, at least from this 

end...

As far as the consequences - probably something like fried avionics, battery 

with water boiled away (check it first), stuff like that.

Richard Pike

MKIII N420P (420ldPoops)



---

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Mon Apr 23, 2007 9:22 pm Post subject: Re: Help-- High Voltage?

16.2 volts is way to high, you should never see it that high. You will fry something in short order with a voltage that high.   I would not fly the plane until the voltage problem is fixed.



Mike

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captainron1(at)cox.net
Guest

Posted: Tue Apr 24, 2007 8:25 am Post subject: Help-- High Voltage?

First thing I would do is hook up a voltage regulator and make sure          the two instruments agree, if not, then I would find out where is the          voltage regulator and swap it out. Other than that can't think of          anything else off hand.              

                       

         Ron (arizona)              

         =-========================

---- Tom O'Hara          <tohara(at)alphagraphics.com> wrote:



=============

-->          Kolb-List message posted by: "Tom O'Hara" <tohara(at)alphagraphics.com>



 First, let me say that I am a buyer/flyer not a builder/flyer. Purchased a          MKIII a year and a half ago and have been having a ball. I believe it          is the first one out of the TN plant.



Saturday I went out for a          flight and had an EIS warning light come on--- voltage. Currently the          EIS is set for 11.2 to 14.6 volts acceptable range. I was running 16.2          to 17.4.



Are the set points correct?

Where should I start          trouble shooting?

What are the consequences of the high voltage?





 Read this topic online here:



         http://forums.matronics.com/viewtopic.php?p=108679#108679



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

 --

kugelair.com

            

      [quote][b]

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captainron1(at)cox.net
Guest

Posted: Tue Apr 24, 2007 8:31 am Post subject: Help-- High Voltage?

First thing I would do is hook up a voltage meter and make sure the          two instruments agree, if not, then I would find out where is the          voltage regulator and swap it out. Other than that can't think of          anything else off hand.              

                       

         Ron (Arizona)              

         =-========================

---- Tom O'Hara          <tohara(at)alphagraphics.com> wrote:



=============

-->          Kolb-List message posted by: "Tom O'Hara" <tohara(at)alphagraphics.com>



 First, let me say that I am a buyer/flyer not a builder/flyer. Purchased a          MKIII a year and a half ago and have been having a ball. I believe it          is the first one out of the TN plant.



Saturday I went out for a          flight and had an EIS warning light come on--- voltage. Currently the          EIS is set for 11.2 to 14.6 volts acceptable range. I was running 16.2          to 17.4.



Are the set points correct?

Where should I start          trouble shooting?

What are the consequences of the high voltage?





 Read this topic online here:



         http://forums.matronics.com/viewtopic.php?p=108679#108679



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

 --

kugelair.com

            

      [quote][b]

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Apr 24, 2007 8:49 am Post subject: Help-- High Voltage?

Gang:



Didn't say what engine he was running, but constant hight voltage on a 

two or four stroke Rotax is time to change out regulator/rectifier. 

Only takes a minute to have the battery boiling.  Been there and done 

that.  As an immediate expedient, turn on everything in the aircraft 

that consumes 12VDC power.  This will lessen the problem until you can 

land and shut down the engine.



john h

mkIII

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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