On Tue, 9 Dec 2014, andy pugh wrote:
Date: Tue, 9 Dec 2014 18:46:19 +0000
From: andy pugh <bodge...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] MTBF
On 3 December 2014 at 15:46, Dave Cole <linuxcncro...@gmail.com> wrote:
If you want a power supply that you can install, power up and have a
fair expectation of it lasting 25+ years I would go with an Acopian
linear power supply.
I have had a chat with them, and it looks like about ??300 for a PSU
for this application.
I am wondering, though, if it might not be a better idea to use a very
simple transformer/rectifier/cap PSU. The solenoid coil seems rather
indifferent to the quality of power, it works down to 5V and probably
wouldn't melt at 50 V. Currently it has a duty cycle of 1.5 A for
100mS every 30 seconds. A ??300 PSU for that seems overkill.
The problem seems likely to be finding a cap that can smooth 1.5A at
50Hz but that will also last a long time.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
What about no cap? The time constant of the solenoid may be sufficient
to filter the 100 Hz ripple, and if not, a series inductor could be added
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Mesa Electronics
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