Florian and Ricardo,

you find my comments below.

Best wishes
Dieter Doepfer

> Hi Florian ,
>
> Thanks for the advice.
>
> It's weird but it was Eric Barbour (Metasonix) who told me to
> wire the -V in the Mean Well switch to the GND terminal in the
> g6. Not sure why he said that , he's not a man of many words.

I think he is right. The Meanwell PSU is obviously a single PSU (i.e. one
voltage output only, not two like the A-100PSU2). In this case the -V output
of the Meanwell has to be connected to GND of the A-100 system. You may use
e.g. a free GND terminal at the bus board. The +V of the Meanwell (= +5V)
has to be connected to the unused +5V terminal of the A-100 bus board.

> When I asked about the G6 connections he said: "ask Doepfer"
> Regarding the connection of the Mean Well input to the G6 Ac
> input , Where's the best place to do this , As you suggested , i
> shouldn't wire them to those connectors with blue caps (3rd
> picture) because they are connected with the fuses. So then ,
> should i wire them together with the G6 black and blue AC input
> cables in their own connectors in the PSU board Does it matter
> which cable goes to each connector

The wiring of the mains terminals of the Meanwell are a bit a problem
because the mains inlet/fuse/switch combo of the A-100 has this sequence:

mains - fuse - switch

If you connect the mains terminals of the Meanwell in parallel to the mains
terminals of the A-100PSU2 there is one common fuse for both PSU only. But
due to electrical safety a separate fuse for each PSU should be available.
This causes a problem because of the mains-fuse-switch sequence mentioned
above. You would have to re-wire the mains inlet and change the wiring
sequence to

/ fuse #1 (for A-100 PSU)
mains - switch --
\ fuse #2 (for the Meanwell PSU)

This requires sufficient electrical knowledge and should be carried out only
by a specialist !!! There is danger to life if you make a mistake in the
wiring !!!

Though it's possible I do not recommend to operate both PSUs with one fuse
only. In this case the value of the fuse has to be calculated by adding the
values of both PSUs. The data sheet of the Meanwell PSU should tell you the
recommended fuse value and you have to add this to the value of the A-100
fuse (800 mA for PSU2 / 115V version).

> Thanks in advance
>
> Ricardo
>
>
>
>
> --- In Doepfer_a100@yahoogroups.com , Florian Anwander
> <fanwander@...> wrote:
> >
> > Hello
> >
> >
> > > 2nd picture: here you see the Mean Well connectors , the GND and -V
> > > connects to one of the G6 case GROUND terminals.
> > WRONG: connect only the Mean Well GND to th G6 Ground terminals. DO NOT
> > connect "-V" to the G6 ground terminals!
> >
> >
> > > 3rd picture: here the G6 psu AC input. There are two red labeled
> > > arrows pointing those blue connector caps, the ones saying :DON't
> > > KNOW WHAT ARE THESE now i think they are placed there to pass AC
> > > power to other psu (in case it's needed) Am I right if not please
> > > let me know their purpose.
> > >
> > > 4th picture: here i removed the cables and caps to have a better look
> > > at the connectors. If the top connectors with the labeled arrows
> > > are there to pass AC power to other psu, then , I assume , i have to
> > > sold the Mean Well AC inputs there, is that ok (I'll add heat
> > > shrink tubbing for protection) , It doesn't matter which Blue or
> > > Black AC lead goes to any of the Mean Well Ac inputs , right (please
> > > check 2nd picture to confirm) If I'm wrong please let me know.
> > Hmm, I would not really do this. These connectors a after (!) the fuse
> > in the power socket on the rear panel. So if you switch on the panel,
> > the fuse would have to stand the current which is drawn from
> the Doepfer
> > supply plus the current drawn from the Mean Well supply. This
> would blow
> > the regular fuse. If you increase the fuses value, then a
> problem at one
> > of the two powersupplies would cause the fuse to blow later than wanted.
> >
> > I recommend to add two additional fuse sockets in the
> rearpanel. One for
> > each of the powersupplies. Then brigde the former fuse holder in the in
> > the power socket with a large valued fuse, and put the suitable
> fuses in
> > the new fuse sockets.
> >
> >
> >
> > > 5th picture: here I'm showing where the +V = (+5v) output on the
> > > Mean Well is going to be connected (as well heat shrink tubbing over
> > > solder points for protection), If wrong please let me know.
> > That is the correct place to add the +V. The ground from the Meanwell
> > should be connected to the bus pcb too. There are additional connectors
> > for +5V and GND at the end of the bus pcb.
> >
> > Florian
> >
> > --
> > http://fa.utfs.org/
> >
>
>
>
>
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