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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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 Posted: Fri Oct 21, 2011 6:33 am Post subject: Jabiru Voltage Regulator Low Voltage Light |
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Hi!
I started my Jabiru 3300 for the first time a couple days ago. Here's a link:
http://www.youtube.com/watch?v=qB0qe9uE1vQ
I found out that I need to reprogram my MGL EFIS, but also my LV indicator light acted unexpectedly. I have the stock voltage regulator which has 6 leads. They say to connect the green one to a LV light, which I did. A fuslink then a 22awg wire takes it back to the panel where I've got it wired to a red LED light and grounded to the panel ground buss. I've got a reverse diode wired across the LED also. My master switch is a 2-10, Off-Bat only-Bat+Alt. With the engine off (no alternator), the LV light is brightly lit in both the Bat only and Bat+Alt positions. With the engine running and the alternator offline, the light is also brightly lit. So far so good.
But when I add the alternator, the light dims about halfway. I expected it to be off. This was at high idle, 900 RPM. The EFIS showed a supply voltage of 12.8V at this time. Would I expect to see the light go out at higher rpm? If not, is there a way to make the dimmed light go out when the alternator is online, and allow a bright light to come through when the alternator is offline?
My MGL Enigma EFIS has an alarm that can be set for LV, so the indicator light is a backup. If I can't fix it, I'd just disconnect it, or wire it to the EFIS for a general warning light that would come on for any alarm.
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Mike Welch
Joined: 13 Feb 2011
Posts: 272
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| Posted: Fri Oct 21, 2011 8:14 am Post subject: Jabiru Voltage Regulator Low Voltage Light |
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Dan,
I noticed in your video that when the motor finally fired up, the plane's tail-end raised up.
I think you dodged a bullet THAT time, but next time you may not be so lucky. A few hundred
more rpm on your initial start-up and I am convinced your plane would have nosed over, wiping out your
prop and lots of other expensive parts...like your motor.
Your wheel chocks and rope to the tree do not address the forward tipping tendency of a highly
revved engine.
I watched this exact same phenomenon a few days ago...also almost tipping onto it's nose.
I highly suggest you consider securing the plane DOWN at the tail-end, like using a steel stake or
VERY heavy weight.
That's just my opinion. Other guys can watch your plane tip forward and make up their own
opinion.
Mike Welch
On Oct 21, 2011, at 9:33 AM, messydeer wrote:
[quote]--> AeroElectric-List message posted by: "messydeer" <messydeer(at)yahoo.com (messydeer(at)yahoo.com)>
Hi!
I started my Jabiru 3300 for the first time a couple days ago. Here's a link:
http://www.youtube.com/watch?v=qB0qe9uE1vQ
I found out that I need to reprogram my MGL EFIS, but also my LV indicator light acted unexpectedly. I have the stock voltage regulator which has 6 leads. They say to connect the green one to a LV light, which I did. A fuslink then a 22awg wire takes it back to the panel where I've got it wired to a red LED light and grounded to the panel ground buss. I've got a reverse diode wired across the LED also. My master switch is a 2-10, Off-Bat only-Bat+Alt. With the engine off (no alternator), the LV light is brightly lit in both the Bat only and Bat+Alt positions. With the engine running and the alternator offline, the light is also brightly lit. So far so good.
But when I add the alternator, the light dims about halfway. I expected it to be off. This was at high idle, 900 RPM. The EFIS showed a supply voltage of 12.8V at this time. Would I expect to see the light go out at higher rpm? If not, is there a way to make the dimmed light go out when the alternator is online, and allow a bright light to come through when the alternator is offline?
My MGL Enigma EFIS has an alarm that can be set for LV, so the indicator light is a backup. If I can't fix it, I'd just disconnect it, or wire it to the EFIS for a general warning light that would come on for any alarm.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=355651#355651
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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| Posted: Sat Oct 22, 2011 4:29 am Post subject: Re: Jabiru Voltage Regulator Low Voltage Light |
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Thanks, Mike and Bob.
Yes, I'll get downward pressure on the tail next time. I've driven a couple pieces of ~1" pipe ~18" into the ground angled back and away from each other, about 2' apart. I'll tie a rope near the ground on one, loop it up 6" to go through the bottom end of the tailcone, then back down to the other pipe. I'm tempted also to put a 50# weight on the end. Right now, there's not much pressure on the tailspring, maybe 20-30 lbs. The wheels being chocked also caused it to nose over, but I think I'll keep them.
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Mike Welch
Joined: 13 Feb 2011
Posts: 272
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| Posted: Sat Oct 22, 2011 7:02 am Post subject: Jabiru Voltage Regulator Low Voltage Light |
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Hi Dan,
It's an excellent idea to hold the tail down better next time. Wheel chocks and ropes straight back to trees
are a great way to keep the plane from rolling forward, but they do virtually nothing to keep the propeller from
driving the nose into the dirt.
A 50# weight tied close to the tail will go a loooong way to keep the plane from catastrophic disaster. The secure
steel pipes are an excellent idea, too......and also the minimum you should consider. The pipes and the weight will
guarantee you will not have that situation reoccur. I'm glad to know you are fixing things.
Mike Welch
On Oct 22, 2011, at 7:29 AM, messydeer wrote:
| Quote: |
Thanks, Mike and Bob.
Yes, I'll get downward pressure on the tail next time. I've driven a couple pieces of ~1" pipe ~18" into the ground angled back and away from each other, about 2' apart. I'll tie a rope near the ground on one, loop it up 6" to go through the bottom end of the tailcone, then back down to the other pipe. I'm tempted also to put a 50# weight on the end. Right now, there's not much pressure on the tailspring, maybe 20-30 lbs. The wheels being chocked also caused it to nose over, but I think I'll keep them.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=355719#355719
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