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bbradburry(at)bellsouth.n
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 Posted: Thu May 22, 2008 12:40 pm Post subject: Previous Master solonoid clicking |
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A while back, I discussed a clicking sound that I heard after I turned the
alternator on when the engine was running.
Today I discovered that my low voltage module was not working and when I
removed it, the clicking went away.
I tested the module by putting +9V on pin 4, grounded pin 5, and looked for
the LED to come on and also for a ground to show up on pin 1. No light, no
ground. Must have crapped out??!!
I also noticed that when the module was disconnected, If I had the main
battery set to "Alternator", and the engine battery set to "ON", I got about
13.4V. If I flipped the engine battery switch to "Auto", the voltage went
up to about 14.6V.
I was at a loss as to why this would be. I didn't try it with the engine
battery set to "OFF", so I don't know what would have happened if I did.
Does anyone have any ideas as to what was happening to cause the clicking if
the module caused it, and why the voltage increase? I at first thought..I
am turning one of the batteries off, so the voltage went up, but then I
thought...why wouldn't the voltage regulator bring it back down in that
case.
Thanks for the help!
Bill B
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bbradburry(at)bellsouth.n
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| Posted: Fri May 23, 2008 7:22 am Post subject: Previous Master solonoid clicking |
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I left out that my plane is wired closely to the Z-19 architecture.
Also the low voltage module is one that I built using one of Bob's boards
from the old model.
Bill B
A while back, I discussed a clicking sound that I heard after I turned the
alternator on when the engine was running.
Today I discovered that my low voltage module was not working and when I
removed it, the clicking went away.
I tested the module by putting +9V on pin 4, grounded pin 5, and looked for
the LED to come on and also for a ground to show up on pin 1. No light, no
ground. Must have crapped out??!!
I also noticed that when the module was disconnected, If I had the main
battery set to "Alternator", and the engine battery set to "ON", I got about
13.4V. If I flipped the engine battery switch to "Auto", the voltage went
up to about 14.6V.
I was at a loss as to why this would be. I didn't try it with the engine
battery set to "OFF", so I don't know what would have happened if I did.
Does anyone have any ideas as to what was happening to cause the clicking if
the module caused it, and why the voltage increase? I at first thought..I
am turning one of the batteries off, so the voltage went up, but then I
thought...why wouldn't the voltage regulator bring it back down in that
case.
Thanks for the help!
Bill B
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nuckolls.bob(at)cox.net
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| Posted: Sat May 24, 2008 4:35 am Post subject: Previous Master solonoid clicking |
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At 11:18 AM 5/23/2008 -0400, you wrote:
| Quote: |
<bbradburry(at)bellsouth.net>
I left out that my plane is wired closely to the Z-19 architecture.
Also the low voltage module is one that I built using one of Bob's boards
from the old model.
Bill B
A while back, I discussed a clicking sound that I heard after I turned the
alternator on when the engine was running.
Today I discovered that my low voltage module was not working and when I
removed it, the clicking went away.
|
How long has the system been in operation? Has it worked as
expected for any period of time and is now behaving differntly?
| Quote: | I tested the module by putting +9V on pin 4, grounded pin 5, and looked for
the LED to come on and also for a ground to show up on pin 1. No light, no
ground. Must have crapped out??!!
|
Send it back for evaluation/repair. You pay the postage
to me, I'll pay it back to you.
| Quote: | I also noticed that when the module was disconnected, If I had the main
battery set to "Alternator", and the engine battery set to "ON", I got about
13.4V. If I flipped the engine battery switch to "Auto", the voltage went
up to about 14.6V.
|
| Quote: | I was at a loss as to why this would be. I didn't try it with the engine
battery set to "OFF", so I don't know what would have happened if I did.
Does anyone have any ideas as to what was happening to cause the clicking if
the module caused it, and why the voltage increase? I at first thought..I
am turning one of the batteries off, so the voltage went up, but then I
thought...why wouldn't the voltage regulator bring it back down in that
case.
|
A reasonable hypothesis suggests that the engine battery
was discharged and was pulling the alternator down while
it was huffing to push energy back into the battery. Putting
the LVWarn/ABMM switch in the AUTO position with the module
disconnected is the same as turning that battery OFF which
would relieve the alternator of that re-charge load. You
didn't mention what RPM the engine was running while these
observations were made. It seems likely that the bus
voltage would come raise while charging the battery if
RPMs were high enough for alternator to develop full output.
Suggest you put battery maintainers on both batteries.
Let's evaluate/repair the LVWarn/ABMM module as needed
before we carry the study further.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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bbradburry(at)bellsouth.n
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| Posted: Sat May 24, 2008 6:37 am Post subject: Previous Master solonoid clicking |
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Bob,
Thanks for the evaluation/repair offer. I will send it in, but please
remember that you only supplied the board. I supplied the components. You
don't owe me any free repair!
The engine, with this module working, has been running on the ground for
probably 2 hours. I am not ready for flight yet.
Bill
--
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nuckolls.bob(at)cox.net
Guest
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| Posted: Sat May 24, 2008 10:10 am Post subject: Previous Master solonoid clicking |
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At 10:31 AM 5/24/2008 -0400, you wrote:
| Quote: |
<bbradburry(at)bellsouth.net>
Bob,
|
| Quote: | Thanks for the evaluation/repair offer. I will send it in, but please
remember that you only supplied the board. I supplied the components. You
don't owe me any free repair!
|
But I do owe you a "grade" on your efforts with
a goal of honing your skills. It also affords me a data
point which may have future value.
I've fielded a ton of incoming cabbages and tomatoes
for allegedly faulty design and/or advice . . . all
based on situations about which I was honorably skeptical
but unable to defend for lack of hands-on experience.
This was in spite of life-time, money-back guarantees
so I suspect the allegations were bogus. But my warranty
extends to both ideas and product so we're doing each
other a favor here my friend.
| Quote: | The engine, with this module working, has been running on the ground for
probably 2 hours. I am not ready for flight yet.
|
Understand. Let's see if we can figure out
what's going on.
Bob . . .
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bbradburry(at)bellsouth.n
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| Posted: Mon Jun 02, 2008 1:12 pm Post subject: Previous Master solonoid clicking |
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I sent the board in the other day. It should be waiting when you return
from your vacation. It will be interesting to see what you find.
Thanks,
Bill B
--
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bbradburry(at)bellsouth.n
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| Posted: Mon Jun 02, 2008 1:13 pm Post subject: Previous Master solonoid clicking |
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I sent the board in the other day. It should be waiting when you return
from your vacation. It will be interesting to see what you find.
Thanks,
Bill B
--
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