Here is a easy mod for the inrush current issue
http://www.repeater-builder.com/astron/inrush/astron-surge.html
Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems™
4616 W Howard Ln Ste 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: t...@flexradio.com <mailto:t...@flexradio.com>
Web: www.flexradio.com <http://www.flexradio.com>
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On 10/26/2012 2:08 PM, Chuck ONeal wrote:
That's normal, mine does it also.
It's caused by the inrush current charging the power supply capacitor
with the resulting current surge in the power transformer making it
"ring". The amount of the surge will depend where on the 60 Hz power
line waveform you happen to switch it on. At the peak of voltage it
will be the worst. That's why it seems to vary each time you turn it on.
The supply could use a step start to eliminate it which basically is a
series resistor in the primary that is shorted out after a few
seconds, allowing the capacitor to charge slowly.
Chuck, K1KW
----- Original Message ----- From: "Hanford R Wright"
<jo...@earthlink.net>
To: "Dave Beumer WØDHB" <d...@w0dhb.net>
Cc: <flexra...@yahoogroups.com>; <flexradio@flex-radio.biz>
Sent: Friday, October 26, 2012 1:54 PM
Subject: Re: [Flexradio] Heads up on Astron Power supplies
I have an Astron RM-35 amp linear power supply powering my Flex-3000
and sometimes it will make a loud clank when I turn it on. Has
anyone know what causes that kind of racket?
73's
Hanford
WA4LZC
CCA # AC11-12590
Sent from my iPhoney please pardon my typos.
On Oct 26, 2012, at 13:01, Dave Beumer WØDHB <d...@w0dhb.net> wrote:
My apologies if this has been posted prior.
I have had 2 Astron RS-35 power supplies fail in 4 years for the
same reason
and apparently others have also.
If you observe any of the following symptoms with your Astron Linear
supply:
- intermittent Crow Bar
- Sudden loss of output
- Strong burning smell
On both of my power supplies the screw they used to fasten the
regulator
board to the top of the capacitor was too long and bottomed out
before the
connection was sufficiently tightened. That in turn caused a bad high
resistance connection that overheated and caused the intermittent
triggering
of the over voltage circuit.
It finally got hot enough to burn the board and damage the capacitor. I
would highly suggest that you check your supply and if they find a
similar
situation that you add a star style lock washer between the board on
the
first ring terminal and another between the two ring terminals. That
should
take enough slop out of it not to bottom the screws and cause a flaky
connection.
The problem didn't show up until about a year or so after I got the
supplies. One was brand new, the other was 10 years old when I got it.
After the above fix, both supplies are working fine.
I think the higher current draw of the V/U unit in my 5000A may have
made
the problem crop up sooner.
Dave
W0DHB
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