Today's Message Index:
----------------------
1. 01:22 PM - Advice on intermittent voltage spiking in Jab 3300 (Skyking13)
2. 01:33 PM - Re: Advice on intermittent voltage spiking in Jab 3300 (Paul Mulwitz)
3. 01:44 PM - Re: Advice on intermittent voltage spiking in Jab 3300 (Nick Otterback)
4. 01:59 PM - Re: Advice on intermittent voltage spiking in Jab 3300 (FLYaDIVE)
5. 02:06 PM - Re: Advice on intermittent voltage spiking in Jab 3300 (Skyking13)
6. 02:11 PM - Re: Advice on intermittent voltage spiking in Jab 3300 (j. davis)
7. 02:24 PM - Re: Re: Advice on intermittent voltage spiking in Jab 3300 (FLYaDIVE)
8. 02:53 PM - Re: Re: Advice on intermittent voltage spiking in Jab 3300 (Paul Mulwitz)
Message 1
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| 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
--------
Blue Skies & Tailwinds,
Captain Bob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470734#470734
Message 2
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| Subject: | Re: Advice on intermittent voltage spiking in Jab |
3300
Hi Bob,
One idea that comes to mind is you don't have your engine electrically
bonded to your airframe. On mine this is accomplished by a large copper
braid connected from the engine to the single ground point for the whole
aircraft which is on the firewall. The braid is connected with
significant slack so the vibrations from the engine don't try to break
the bond wire or shake the firewall.
Paul
Camas, WA
Zodiac XL, Jab 3300
On 7/6/2017 1:22 PM, Skyking13 wrote:
>
> 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 & Tailwinds,
> Captain Bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470734#470734
>
>
Message 3
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| Subject: | Advice on intermittent voltage spiking in Jab |
3300
The engine is grounded to the Airframe with a 4gauge welding cable. That ground
point is grounded to the main ground buss for the entire aircraft with another
4 gauge welding cable. More than sufficient for the job.
Nick Otterback
Arion Aircraft LLC
General Manager
9316801781
nick@flylightning.net
Open Mon- Friday 8am-5pm
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Paul Mulwitz
Sent: Thursday, July 06, 2017 3:33 PM
Subject: Re: JabiruEngine-List: Advice on intermittent voltage spiking in Jab 3300
Hi Bob,
One idea that comes to mind is you don't have your engine electrically bonded to
your airframe. On mine this is accomplished by a large copper braid connected
from the engine to the single ground point for the whole aircraft which is
on the firewall. The braid is connected with significant slack so the vibrations
from the engine don't try to break the bond wire or shake the firewall.
Paul
Camas, WA
Zodiac XL, Jab 3300
On 7/6/2017 1:22 PM, Skyking13 wrote:
>
> 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 & Tailwinds,
> Captain Bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470734#470734
>
>
Message 4
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| Subject: | Re: 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@gmail.com> wrote:
> robertkperry@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 & Tailwinds,
> Captain Bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470734#470734
>
>
Message 5
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| 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.
--------
Blue Skies & Tailwinds,
Captain Bob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470739#470739
Message 6
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| Subject: | Re: 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@gmail.com> wrote:
> 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@gmail.com> wrote:
>
>> robertkperry@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 & 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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>>
>>
>>
>
Message 7
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| Subject: | Re: Advice on intermittent voltage spiking in |
Jab 3300
OUCH!!!!
Sorry Bob ;-(
And I guess installing a separate belt or direct driven alternator would be
quite difficult?
Can you supply me with schematic of the alternator and electrical system?
I should be able to identify the problem. BUT!!! If the only problem is
overvoltage the cure should be easy... I am an EE & ME.
Barry
On Thu, Jul 6, 2017 at 5:06 PM, Skyking13 <robertkperry@gmail.com> wrote:
> robertkperry@gmail.com>
>
> 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.
>
> --------
> Blue Skies & Tailwinds,
> Captain Bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470739#470739
>
>
Message 8
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| Subject: | Re: Advice on intermittent voltage spiking in |
Jab 3300
I think the magnets and pickup you mentioned are not the alternator but
rather the ignition system. The wires from the pickups shouldn't go to
the voltage regulator (I think) but should connect eventually to the
distributors and spark plugs. I can't remember where the electronics
live in the ignition system but I don't think it is the voltage
regulator which is part of a different system entirely.
I think the alternator on the Jabiru 3300 is inside the bright aluminum
frame work on the back of the engine.
Paul
On 7/6/2017 2:24 PM, FLYaDIVE wrote:
> 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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