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EMC testing, problems with MeanWell power supply

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floobydust:
It's not the power supply, Mean Well GS12 is using TYN279PN SMPS IC which has auto-restart every 2.5 seconds after a perceived fault. I don't see this PSU going to lockout and needing a reboot, or doing anything strange after EFT.

Without some pictures of the product, it is hard to help with EMC troubleshooting. You can black out some parts of the photos, or use an EMC consultant.

For EMC testing, you have to be in the lab and not let techs or people who don't know the design, putting it through testing. Your company will soon learn why. Usually it is an idiot manager or arrogant engineer that thinks EMC tests are done this way, without the designer there. It costs a lot of money to keep repeating EMC tests and guessing what the problem is.

Gyro:

--- Quote from: honeybadger on March 16, 2019, 02:59:15 pm ---My colleague is quiet eager so he will try it with a different PSU next week. If this fails I will be there in person next time - I am not able to clone myself.

--- End quote ---

I will not comment further (it's not really possible with the lack of solid information anyway), other to say that non technical 'eagerness' is no qualification / justification for the task. If you were there, you wouldn't be wasting a greater amount of time quizzing your colleague, talking about it, second guessing, sourcing other PSUs etc.  There is no need to clone, just prioritize. There are few activities for an engineer that have a larger payback per hour spent. I can't understand your plan, given the results so far, but good luck with it anyway. :)

nctnico:
I fully agree with Gyro. If you can't be there then there is no use to do another test. Time at test houses is expensive and I can't imagine anything else being a better use of money other than being there.

honeybadger:
blueskull: I think the problem is someone decided we need to test it for 2kV as "Industrial" and the PSU is tested only for 1kV.

There is the power input side. It is as simple as it can be. V_SENSE goes through voltage divider -> filtration cap -> comparator -> Arduino. Arduino survives the blast so this should not be a problem.
LCD_PWR is only for the backlight LEDs.

D5 and D6 are TVS diodes.

honeybadger:
Good News Everyone! It was the power supply in combination with 2kV test which was not necessary.

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