Looking for 60W PSU in the UK????

[Davek0974]

Nah, i looked inside the one i have and it has semiconductors bolted to the back case panel.

I could make an adaptor mount panel easily if the sizes work out, if not i'll have to drill some holes.

[Lee Roberts]

Ahh fair enough, new holes sound less involved then!

[Voicecoil]

Incidentally, if it is simply a leakage matter (sometimes caused by a slightly wonky interference filter on the PSU input), adding an isolation transformer will often cure it.

[Davek0974]

Thats what i thought, i'll keep that idea as a final option. I think i am right that in this instance I would continue the earth connection through to the machine as well, for static and safety reasons - its a complex matter when using isolating transformers.

[Voicecoil]

Yes, certainly keep the earth running through, it still has some safety value and will likely help with interference supression as well. And you'd only need a very basic 230V: 230V (or 230V : 2 x 115V) transformer, not the typical industrial types that have 380V inputs and auxiliary 24V windings.

[Davek0974]

Well, there's salutary lesson in checking things again and again....

Fitting the new PSU, drilled holes, mounted, went to check the connections and.......found what was the original fault !

Have a look at the picture below of the mains power connector in place, those with eagle-eyes will spot the error, an error that means the machine will run fine on a supply with only MCB's but will fail on a supply with RCD's.....



Spotted it yet?

Our wonderful Chinese machine builders have wired the Neutral and Earth connections in the wrong order so the supply was across the earth and live not the live and neutral. Passing the current to earth (although electrically connected at the main supply) is enough to trip the RCD every time.

So £120 and three days later (good speed from China) I now have a new PSU plus the old one as a spare :(

Oh well, lesson learned but in my defence, the old PSU did not have markings for the supply terminals so without the new one as reference it probably would not have been spotted.

[Voicecoil]

The oriental numpty farm is obviously still going strong.... just be thankful that live and neutral weren't swapped at your workplace.....