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Advice on intermittent voltage spiking in Jab 3300

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Skyking13

Joined: 22 Nov 2016
Posts: 8
Location: California

Posted: Thu Jul 06, 2017 12:22 pm Post subject: Advice on intermittent voltage spiking in Jab 3300

After a recent catastrophic engine failure I purchased and installed a nearly new (14.6 hour) Gen 3 Jabiru 3300 engine to install in my Arion Lightning LS-1. After installation of the new engine I returned the aircraft to my home base and after about 10 minutes of flight I had a "High Volts" warning on my GRT Sport EFIS. The engine screen showed about 17.9 volts on the bus and battery.

I didn't experience any other problems and landed uneventfully. I then swapped the voltage regulator that was on the aircraft with the one that came with the Jabiru 3300 (same make/model regulator). I was certain that I matched the connections that existed prior to the engine swap when exchanging the regulators. I performed several additional flights testing the new engine and adjusting the prop for best performance but still had some recurring instances of "High Volts". Some of those occurrences happen intermittently during flight and sometimes the "High Volts" light and warnings happen right after takeoff and remain on until power is reduced for landing. Volts seem ok at idle at about 14 but go as high as 18 volts when the warning is illuminated. 

I have to confess to having little understanding of wiring, multi testers, and the magic of aircraft electrical systems. 

What may be causing this occasionally happening problem with my electrical system. I've checks connections again and again.

Thanks, Captain Bob

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_________________
Blue Skies & Tailwinds,
Captain Bob

BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Thu Jul 06, 2017 12:59 pm Post subject: Advice on intermittent voltage spiking in Jab 3300

Bob:

Working backwards...  Where does the voltage come from?  The Alternator!  So, start there.  

Bad brushes will cause both high current and voltage spikes.

Do you / Your plane have any OverVoltage protection circuits other than what is built into the ACU?

If it does - REMOVE THEM.

Check the resistance of your FIELD circuit on the Alternator.  It should read no more than 4 ohms.

Check the resistance of the wire going to the Field circuit from the ACU to the Alt.  Should read ZERO ohms.

ANY resistance there will increase the output of the Alt.

REMOVE the screws and Star Lock Washers on the ACU, GROUND and ALT.  Wire brush the connections and install NEW Star Lock washers.

There are other tricks for checking the ACU, but these are the basic steps.  Let's eliminate them firt.

Barry

On Thu, Jul 6, 2017 at 4:22 PM, Skyking13 <robertkperry(at)gmail.com (robertkperry(at)gmail.com)> wrote:

 	  Quote: 	
		  --> JabiruEngine-List message posted by: "Skyking13" <robertkperry(at)gmail.com (robertkperry(at)gmail.com)>

 

 After a recent catastrophic engine failure I purchased and installed a nearly new (14.6 hour) Gen 3 Jabiru 3300 engine to install in my Arion Lightning LS-1. After installation of the new engine I returned the aircraft to my home base and after about 10 minutes of flight I had a "High Volts" warning on my GRT Sport EFIS. The engine screen showed about 17.9 volts on the bus and battery.

 I didn't experience any other problems and landed uneventfully. I then swapped the voltage regulator that was on the aircraft with the one that came with the Jabiru 3300 (same make/model regulator). I was certain that I matched the connections that existed prior to the engine swap when exchanging the regulators. I performed several additional flights testing the new engine and adjusting the prop for best performance but still had some recurring instances of "High Volts". Some of those occurrences happen intermittently during flight and sometimes the "High Volts" light and warnings happen right after takeoff and remain on until power is reduced for landing. Volts seem ok at idle at about 14 but go as high as 18 volts when the warning is illuminated.

 I have to confess to having little understanding of wiring, multi testers, and the magic of aircraft electrical systems.

 What may be causing this occasionally happening problem with my electrical system. I've checks connections again and again.

 Thanks, Captain Bob

 

 --------

 Blue Skies &amp; Tailwinds,

 Captain Bob

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=470734#470734

 

 

 

 

 

 

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Skyking13

Joined: 22 Nov 2016
Posts: 8
Location: California

Posted: Thu Jul 06, 2017 1:06 pm Post subject: Re: Advice on intermittent voltage spiking in Jab 3300

Barry,

Thanks for the quick reply. Although I'll have to talk to some others who actually can translate much of what you've said, the Jabiru 3300 doesn't have a regular alternator, but something with magnets wound into the rear flywheel of the engine with two white wires that are connected to the voltage regulator. 

I don't think there are any brushes.

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_________________
Blue Skies & Tailwinds,
Captain Bob

jwd3ca(at)gmail.com
Guest

Posted: Thu Jul 06, 2017 1:11 pm Post subject: Advice on intermittent voltage spiking in Jab 3300

All good suggestions, but don't think he's using an aftermarket alternator with brushes. Polly standard Jabiru stator dynamo.



On Jul 6, 2017 14:01, "FLYaDIVE" <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote: 	  Quote: 	
		  Bob:

Working backwards...  Where does the voltage come from?  The Alternator!  So, start there.  

Bad brushes will cause both high current and voltage spikes.

Do you / Your plane have any OverVoltage protection circuits other than what is built into the ACU?

If it does - REMOVE THEM.

Check the resistance of your FIELD circuit on the Alternator.  It should read no more than 4 ohms.

Check the resistance of the wire going to the Field circuit from the ACU to the Alt.  Should read ZERO ohms.

ANY resistance there will increase the output of the Alt.

REMOVE the screws and Star Lock Washers on the ACU, GROUND and ALT.  Wire brush the connections and install NEW Star Lock washers.

There are other tricks for checking the ACU, but these are the basic steps.  Let's eliminate them firt.

Barry

On Thu, Jul 6, 2017 at 4:22 PM, Skyking13 <robertkperry(at)gmail.com (robertkperry(at)gmail.com)> wrote:

 	  Quote: 	
		  --> JabiruEngine-List message posted by: "Skyking13" <robertkperry(at)gmail.com (robertkperry(at)gmail.com)>

 

 After a recent catastrophic engine failure I purchased and installed a nearly new (14.6 hour) Gen 3 Jabiru 3300 engine to install in my Arion Lightning LS-1. After installation of the new engine I returned the aircraft to my home base and after about 10 minutes of flight I had a "High Volts" warning on my GRT Sport EFIS. The engine screen showed about 17.9 volts on the bus and battery.

 I didn't experience any other problems and landed uneventfully. I then swapped the voltage regulator that was on the aircraft with the one that came with the Jabiru 3300 (same make/model regulator). I was certain that I matched the connections that existed prior to the engine swap when exchanging the regulators. I performed several additional flights testing the new engine and adjusting the prop for best performance but still had some recurring instances of "High Volts". Some of those occurrences happen intermittently during flight and sometimes the "High Volts" light and warnings happen right after takeoff and remain on until power is reduced for landing. Volts seem ok at idle at about 14 but go as high as 18 volts when the warning is illuminated.

 I have to confess to having little understanding of wiring, multi testers, and the magic of aircraft electrical systems.

 What may be causing this occasionally happening problem with my electrical system. I've checks connections again and again.

 Thanks, Captain Bob

 

 --------

 Blue Skies &amp; Tailwinds,

 Captain Bob

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=470734#470734

 

 

 

 

 

 

 ===========

  -

 ruEngine-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

 ===========

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ===========

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