Nord PSU question--used wrong voltage (230 on transformer set to 115). What do I do next?

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smrfz
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Nord PSU question--used wrong voltage (230 on transformer set to 115). What do I do next?

Post by smrfz »

UPDATE: it was the fuse (US power and fuse worked ok). Will get a new fuse (with correct 230V) and hopefully that will work.

So this is actually about a NW1 but the PSUs seem to be the same as the leads and I figured there might be more knowledge here.

Long story short, I plugged my NW1 into 220V when the transformer was set to 115V. I DID change the fuse before hand but forgot the switch the transformer internally :facepalm: :facepalm: :facepalm: :facepalm: :facepalm: :facepalm:

The unit lit up briefly before turning off. No pops or burning that I was aware of.

I then opened up and switched the transformer to 230V and switched back on--nothing :(

So three possible scenarios:
1) I blew the fuse (seems unlikely, it still looks intact).
2) I blew the transformer (likely)
3) I blew something downline ("hopefully" less likely?)

Can anyone suggest anything I can do to check this? I guess I could check to see if any voltages coming out of the PSU to start with...
Last edited by smrfz on 22 Nov 2025, 14:57, edited 1 time in total.
cgrafx
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Re: Nord PSU question--used wrong voltage (230 on transformer set to 115). What do I do next?

Post by cgrafx »

Most likely blew the fuse even if it looks intact. Start there.
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Re: Nord PSU question--used wrong voltage (230 on transformer set to 115). What do I do next?

Post by smrfz »

cgrafx wrote: 21 Nov 2025, 22:32 Most likely blew the fuse even if it looks intact. Start there.
So it was actually the fuse! I switched back to a US fuse (and 115V) and using a power converter it turned right on. PHEW.

But my question now is, how would a 230V rated fuse blow? Could the transformer not being switched correctly actually cause that?
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Re: Nord PSU question--used wrong voltage (230 on transformer set to 115). What do I do next?

Post by cgrafx »

fuses are not voltage dependent devices, they are current dependent devices. They blow when the current through them exceeds the rated amperage.
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Re: Nord PSU question--used wrong voltage (230 on transformer set to 115). What do I do next?

Post by FZiegler »

A 230V rated fuse doesn't mean it's meant to blow when exceeding that voltage - as cgrafx said. A fuse being 230 V rated only means that it's 230 V proof for doing its work.
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