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High Voltage Indication

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JimmieBlackwell(at)austin
Guest

Posted: Fri Feb 02, 2007 7:35 pm Post subject: High Voltage Indication

With engine running I normally see about 14 volts  indicated on the panel meter and pulsating slightly if the strobes are on.   While flying today I noted that the voltage pegged high for awhile and then  settled back down to normal.  A  few minutes later the volt meter  again pegged high, (above 16 volts).  At that point I turned off the  alternator circuit and the meter immediately dropped down and showed a steady  13-14 volts.  Turning the alternator on again the volt meter pegged high  again, but after awhile settled down to normal.

  

 Would appreciate any ideas on what may be causing  this indication.

  

 Jimmie

 Model IV Speedster, 912  UL

   [quote][b]

kitfox(at)ida.net
Guest

Posted: Fri Feb 02, 2007 8:42 pm Post subject: High Voltage Indication

Internal regulator on the alternator??? They can  weld shut on some units when they are overloaded.

 ALbert

   [quote][b]

smokey_bear_40220(at)yaho
Guest

Posted: Sat Feb 03, 2007 3:18 am Post subject: High Voltage Indication

"Welded" points in the regulator, as has already been

mentioned, is the likely cause.  These points will

develope pits on one side and built up points on the

other.  Gently prying the points open will show if

that is true.  Filing them level will temporarily fix

it until replaced, but they will wear faster when

filed.  If you find the points are the problem,

replace ASAP.  Some things don´t like the high voltage

spikes.



Kurt S.  S-5



--- Jimmie Blackwell <JimmieBlackwell(at)austin.rr.com>

wrote:



 	  Quote: 	
		   With engine running I normally see about 14 volts

 indicated on the panel meter and pulsating slightly

 if the strobes are on.  While flying today I noted

 that the voltage pegged high for awhile and then

 settled back down to normal.  A  few minutes later

 the volt meter again pegged high, (above 16 volts). 

 At that point I turned off the alternator circuit

 and the meter immediately dropped down and showed a

 steady 13-14 volts.  Turning the alternator on again

 the volt meter pegged high again, but after awhile

 settled down to normal.

 

 Would appreciate any ideas on what may be causing

 this indication.

 

 Jimmie

 Model IV Speedster, 912 UL


	




 

Finding fabulous fares is fun.  

Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains.

http://farechase.yahoo.com/promo-generic-14795097

JimmieBlackwell(at)austin
Guest

Posted: Sat Feb 03, 2007 4:23 am Post subject: High Voltage Indication

Albert/Kurt

Sounds like a likely source.



Thank you.

---

Fox5flyer
Guest

Posted: Sat Feb 03, 2007 4:50 am Post subject: High Voltage Indication

Sounds to me like the voltage  regulator.

 Deke

  

 [quote]   ---

Bob

Joined: 24 Oct 2006
Posts: 89
Location: Damascus, Maryland, USA

Posted: Sat Feb 03, 2007 4:57 am Post subject: Re: High Voltage Indication

Good suggestions, but the first and easiest step is to check and clean each of the the alternator and battery connections.  If a bit loose or corroded, the regulator may sense lower voltage (V=IR, with increased R) and try to make up for it.

Bob

_________________
Remember that internet advice may only be worth what you pay.

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Sat Feb 03, 2007 5:27 am Post subject: High Voltage Indication

912 info overvoltage info you you guys,



Dave



Figure Z-16. Rotax 912/914 System is a "stone simple"



electrical system typical of many aircraft fitted with



permanent magnet alternators. A noteworthy feature in this



figure is the means by which I've added OV protection to the



alternator system. Many airplanes flying with a Rotax 912



have relatively small batteries. Even the limited 18 amps of



alternator output can push the bus voltage up rather quickly



on a small battery. Adding the relay and OV module as



shown provides automatic protection from unobserved



regulator failure.

---

_________________
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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Sat Feb 03, 2007 5:43 am Post subject: High Voltage Indication

Sorry,  I forgot the link

http://www.aeroelectric.com/articles/Rev11/AppZ_R11J.pdf

---

Glenn Horne

Joined: 10 Jan 2006
Posts: 96

Posted: Sat Feb 03, 2007 5:57 am Post subject: High Voltage Indication

Had the same problem with my Key West regulator and  it blew off the firewall.

 Called Key West manufacture and they have had  problem with the older models 

 regulators. The compactor inside is suppose to be  vented to the atmosphere.

 If yours is a Key West give them a call and they  will re-place it free.

 Glenn Horne

 Model II 582 ----- Original Message  ----- 

 [quote]   From:    Jimmie Blackwell (JimmieBlackwell(at)austin.rr.com) 

   To: kitfox-list(at)matronics.com (kitfox-list(at)matronics.com) 

   Sent: Friday, February 02, 2007 10:32    PM

   Subject: High Voltage    Indication

   



   With engine running I normally see about 14 volts    indicated on the panel meter and pulsating slightly if the strobes are    on.  While flying today I noted that the voltage pegged high for awhile    and then settled back down to normal.  A  few minutes later the volt    meter again pegged high, (above 16 volts).  At that point I turned off    the alternator circuit and the meter immediately dropped down and showed a    steady 13-14 volts.  Turning the alternator on again the volt meter    pegged high again, but after awhile settled down to normal.

    

   Would appreciate any ideas on what may be causing    this indication.

    

   Jimmie

   Model IV Speedster, 912 UL

 	  Quote: 	
		  



href="http://www.matronics.com/Navigator?Kitfox-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.com



	
[b]

kerrjohna(at)comcast.net
Guest

Posted: Sat Feb 03, 2007 6:34 am Post subject: High Voltage Indication

voltage regulator going, going, gone south....

  

 It happened to me over the backwoods of Idaho.  I coaxed it back to civilization and ordered a replacement from Lockwood.

  

 John Kerr

  

 [quote]-------------- Original message -------------- 

From: "Jimmie Blackwell" <JimmieBlackwell(at)austin.rr.com> 

    With engine running I normally see about 14 volts indicated on the panel meter and pulsating slightly if the strobes are on.  While flying today I noted that the voltage pegged high for awhile and then settled back down to normal.  A  few minutes later the volt meter again pegged high, (above 16 volts).  At that point I turned off the alternator circuit and the meter immediately dropped down and showed a steady 13-14 volts.  Turning the alternator on again the volt meter pegged high again, but after awhile settled down to normal.

  

 Would appreciate any ideas on what may be causing this indication.

  

 Jimmie

 Model IV Speedster, 912 UL

 	  Quote: 	
		  

	
[b]

lcfitt(at)sbcglobal.net
Guest

Posted: Sat Feb 03, 2007 8:01 am Post subject: High Voltage Indication

Sorry, no joy here, the 912 has a generator and no points in the regualtor.



Lowell

---

smokey_bear_40220(at)yaho
Guest

Posted: Sat Feb 03, 2007 9:14 am Post subject: High Voltage Indication

Thanks lowell,



The old points systems were not as reliable, but you

could temp fix them with a fingernail file until you

got home.  Something gained, something lost.



If not a bad connection as Rob says, a change is

required.  Hopefully the free replacement mentioned

for the bad capacitor???



Kurt S.



Do not archive



--- Lowell Fitt <lcfitt(at)sbcglobal.net> wrote:



 	  Quote: 	
		   Sorry, no joy here, the 912 has a generator and no

 points in the regualtor.

 

 Lowell


	




 

Don't pick lemons.

See all the new 2007 cars at Yahoo! Autos.

http://autos.yahoo.com/new_cars.html

torgemor(at)online.no
Guest

Posted: Sat Feb 03, 2007 3:28 pm Post subject: High Voltage Indication

Hi Jimmie,



Interesting, this one.



As many already said, this system is a "permanent magnet generator"  

system, well -if you do not have the "optional alternator system" with  

this fault..  



Anyhow, this is the charging system that's found in all of the Rotax  

engines, even the smallest of them..



The (big?) benefit of this system -over the standard alternator setup is  

this(I'll belive); this system do not need any excitation voltage to come  

alive. So, if your battery is completely dead and you manage to start your  

engine, this system start to deliver power anytime the engine is running.



Yes, -as all the others out there I'll agree this might be the  

rectifier-regulator that's fails "now and then".



But, don't throw away your old regulator yet, -cause I do believe there is  

a spare circuit inside this box!  Why you might ask, well remember this  

unit is born as a three phase unit -and most probably contain one more SCR  

(silicone controlled rectifier) unit that's working OK.



Now remember this regulator contain three yellow input wires, and one of  

them is never in use, so you'll have two more combination to try -and one  

of them probably give you a new regulator..



This depend a little if there is one zener for each phase, or if it just  

one zener for all three phases -then bad luck, if it is the zener that's  

the problem, bad luck.



Over the yrs. most of the problems like this is due to a faulty zener  

(diode), but sometimes other parts fails. So, make a try!



Just something general about this system;  This regulator shunt the  

alternator if the voltage arise above the preset voltage (close to 14  

volt), then the SCR short all the way until the current cross the "zero"  

line, then it's ready for a new shot (half period). So you see, this  

system work with full load all the time, even when your battery is fully  

charged or all empty.



Here's a link to tympanium corp., the producer of those regulators:



I'll think the design tip is worth reading.



http://www.tympanium.com/index.html



Here's another one, a complete schematic, for those who want to build your  

own one -go for diodes and SCR's handling 40 Amp's and this never fails,  

 , experimental -yes  :



http://www.takisnet.org/~abayko/vreg.pdf



You know, I've often heard lot's of good thing about Key West rectifier  

regulator, but folks where can we find some more facts about this  

regulator, -as is this a serial regulator (?), or is this just another  

shunt rectifier-regulator?



Why do I ask like this, well -  (see my next posting).

Keep up the good work, and good luck.

Torgeir.

On Sat, 03 Feb 2007 04:32:40 +0100, Jimmie Blackwell  

<JimmieBlackwell(at)austin.rr.com> wrote:



 	  Quote: 	
		   With engine running I normally see about 14 volts indicated on the panel  

 meter and pulsating slightly if the strobes are on.  While flying today  

 I noted that the voltage pegged high for awhile and then settled back  

 down to normal.  A  few minutes later the volt meter again pegged high,  

 (above 16 volts).  At that point I turned off the alternator circuit and  

 the meter immediately dropped down and showed a steady 13-14 volts.   

 Turning the alternator on again the volt meter pegged high again, but  

 after awhile settled down to normal.



 Would appreciate any ideas on what may be causing this indication.



 Jimmie

 Model IV Speedster, 912 UL


	


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