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Power pack sizzles

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The power supplies are from meanwell, they take their supplies quite seriously, also on a safety standard. We tried everything to get them "destroyed", nothing worked. We did have 1 bad supply (in about 100) which died from a short-circuit, but it didn't do anything else then that. It just stopped working. (We tested a lot of the UM2 supplies on short circuit protection after that, never managed to destroy one after that single one)

There are 2 possible sources for the noise, one could be bad contact from the cable. Which is no real worry, but could switch off your printer unexpectedly. Another is the fact that it's a switching power supply, those emit frequencies, sometimes you can hear those frequencies.


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