Answer from the Supply Manufacturer was RE: [sdiy] The Next Newb ie Power Supply question...

[Rhen, Kris]

Heard back from the mfr's tech support - here's their official word:
 
Kris,
1)  No need to jumper or make any connections to the +S & -S.
2)  For 115VAC input make sure to jumper terminals 1 & 3 and 2&4 and apply
AC input to 1 & 4.  The AC fuse is 2A slow blo.
3)  If fuse rating is correct try disconnecting the ground you have on the
output.
4)  The output grounds can be connected to the same point as the AC ground.
5)  No other wiring diagrams available just follow the AC connection chart
on the power supply silkscreen.
Hope this helps.
 
It doesn't :-(  Looking for shorts now...
KRIS

-----Original Message-----
From: John L Marshall [mailto:john.l.marshall at gte.net]
Sent: Monday, December 10, 2001 7:25 PM
To: 'SynthDIYmailinglist '
Subject: Re: [sdiy] The Next Newbie Power Supply question...


+S must be connected to +5V and -S must be connected to GND preferably at
the load but okay at the power supply.
 
See if the transformer primary has an internal short to ground.
 
A 1A fuse in the primary implies that the power supply can draw upto 120
watts. At 50% efficency 60 watts for load. Plenty.

----- Original Message ----- 
From: Rhen, Kris <mailto:krhen at stucki.com>  
To: 'SynthDIYmailinglist ' <mailto:synth-diy at dropmix.xs4all.nl>  
Sent: Monday, December 10, 2001 2:43 PM
Subject: [sdiy] The Next Newbie Power Supply question...


I've got a +-12v, +5v regulated power supply which is acting odd (or more
likely I just don't understand what's up with it).  Wired it up to take AC
through a standard plug, one of the non-ground leads goes through a fuse (in
this case a 1A fast-blow fuse, even though the supply goes to 1.5A I'll
never draw that much from it).  The other end of the fuse, as well as the
other non-ground lead from the input goes to the supply.  I take the ground
and connect it to the case as well as the GROUND output lead (of which it
has two)  Power it up as-is and its great, I get my +12v, -12v and +5v
relative to the ground just fine.

Now I run some wires from the GND, +5, +12 and -12 to a power dist board and
power it up with a switch on a power strip its plugged into.  Fuse blows
with a nice flashy lightshow.  I've gone through a couple of fuses like this
(note NO LOAD (Doepfer/As/AS modules) yet - and I won't until I understand
why they're blowing).  Note its outputs are

-12v   GND   +12v   +5v   +S   -S   GND 

and I don't have the sensing hooked to anything.  

Can anyone tell me (without shouting :-) why the fuse is blowing?  Again,
gotta learn somehow and you all have been great teachers.  Thanks again

KRIS 



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