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dan(at)azshowersolutions.
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 Posted: Mon Jun 18, 2012 5:24 am Post subject: SL-40 |
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Bob,
A good thought, but the first fuse blew as I was doing that very thing (running with the alternate feed switch closed). So for the last 12 hours or so, I have run with the alternate switch off. Just strange that it took 12 hours to pop again. Like one of the guys suggested, when I do my tests I might find the radio draw is dancing around the 5A limit...so over time it would probably eat away at the fuse until it fails. I guess the easy fix could be to throw the 7.5 A in there, but it still bothers me that the radio specs indicate the high end draw at tx should be 3.5A (going from memory here) or close to that. I am off to the field now and hope to gather some useable information today. Just hope I don't blow a fuse out there...should get up to about 110 in Phoenix today.
Dan
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Friday, June 15, 2012 10:35 AM
Subject: Re: SL-40
| Quote: | | Bob, the problem fuse is on the E-bus (Z-16) going to the SL-40 radio. I have a 5A fuse there as called out in the installation manual. |
Yeah, I recall now.
Okay, if you're blowing that fuse, it's because the
radio draws enough current to do it. Do I recall that
the fuse does not pop if the alternate feed switch to
the e-bus is closed? A useful experiment would be to
leave the alternate feed switch on for all normal ops.
Turn it on before master switch, off after master
switch. See if the fuse blowing behavior changes.
[quote] Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 19, 2012 3:01 am Post subject: SL-40 |
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At 08:22 AM 6/18/2012, you wrote:
Bob,
A good thought, but the first fuse blew as I was doing that very
thing (running with the alternate feed switch closed). So for the
last 12 hours or so, I have run with the alternate switch off. Just
strange that it took 12 hours to pop again. Like one of the guys
suggested, when I do my tests I might find the radio draw is dancing
around the 5A limit...so over time it would probably eat away at the
fuse until it fails. I guess the easy fix could be to throw the 7.5 A
in there, but it still bothers me that the radio specs indicate the
high end draw at tx should be 3.5A (going from memory here) or close
to that. I am off to the field now and hope to gather some useable
information today. Just hope I don't blow a fuse out there...should
get up to about 110 in Phoenix today.
As I mentioned before, fuses should be 'de-rated'
about 25%, 50% doesn't hurt a thing. If your radio
is drawing that much current, there has to be a reason.
What are your bus voltage measurements showing?
Bob . . .
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