[sdiy] blowing fuses

[ColinMuirDorward]

Maybe someone has some suggestions for me.

I'm blowing fuses on my "industrial" power supply. This is a salvaged
+/-15v, 3a supply housed in a rugged metal enclosure. I've wired it up with
a fuse on the AC mains side, and fuses on the +/-15v side. The AC/mains
fuse is giving me grief.

Step1) I can turn the unit on, and everything is fine. My synth is only
drawing 1/2 an amp (or nothing when disconnected).
Step2) Turn the unit off. At this point, I can remove the mains fuse, and
test it: yes, still good.
Step3) Re-install fuse, switch on. Nothing. Remove fuse and test again, now
it's blown.
Step4) Install new fuse. Go to Step1)

I haven't used the PSU much yet, but I've powered it on and off loads of
times and this problem never manifested till now. The fuses are 2amp, 250v,
which I think is fine, but here is maybe my mistake: they are quick blow
type. I'm uncertain, though. Wondering if I need to try to find a fault in
the PSU, or just order the new fuses. But why didn't those quick blow fuses
break before?

Thanks for reading!
Colin


-- 
https://www.instagram.com/colinmuirdorward/
-
<https://www.instagram.com/colinmuirdorward/>
https://www.instagram.com/ssdp_synthesis/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20200216/f39bf6c4/attachment.htm>