I ran into this same problem, and solved it by adding a second power supply.
(Ultimately I added a third, but that was because I didn't plan well when I
bought the second.) However, I wonder whether the simplest solution would be
a nice, hefty double-pole switch between the two distribution boards. No
fancy sequencer needed--just turn on the AC switch first, then turn on the
switch between the two distribution boards a few seconds later after the
caps on the first set of modules have charged up. Of course you have to
remember to turn off that switch, too, but after latching up your supply a
few times you'll learn. :-)
--Adam
> -----Original Message-----
> From: Mike Marsh [mailto:michael_marsh@...]
> Sent: Tuesday, November 22, 2005 8:35 PM
> To: motm@yahoogroups.com
> Subject: [motm] Re: Power Supply Crowbar
>
>
> Or add a second power supply...
>
> --- In motm@yahoogroups.com, "Paul Schreiber" <synth1@a...> wrote:
> >
> > It's not the steady-state load, it's charging up all the caps on
> the boards. The
> > current in the first 100ms is probably 1A or so.
> >
> > No real easy solution.....power sequencing is the best.
> >
> > Paul S.
> >
> >
> >
> > ----- Original Message -----
> > From: "djbrow54" <davebr@e...>
> > To: <motm@yahoogroups.com>
> > Sent: Tuesday, November 22, 2005 4:40 PM
> > Subject: [motm] Power Supply Crowbar
> >
> >
> > >I am running a single HAA15-0.8-A power supply in my middle cabinet
> > > connected to two MOTM-960 distributions boards, one on each
> side. I
> > > have been having problems with the power supply current limiting
> on
> > > power up. My total load on this supply is 480 mA nearly balanced
> on
> > > both +/- 15 volts.
> > >
> > > What have others done to deal with this? I've moved some modules
> > > around trying to change the loading but it never really fixes it.
> > >
> > > I've been thinking of adding a small sequencer to enable one of
> the
> > > 960 distribution boards after a small delay.
> > >
> > > Would some bulk inductance in series help?
> > >
> > > Thanks in advance. - Dave
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> >
>
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>
>
> Yahoo! Groups Links
>
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>