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The problem is that you put the AC Input Voltage directly on the not grounded frame.
Your frame has no ground, is insulated by rubber feets. So the only way that a shortcut can go
is to stay on the frame, that means 220 V AC life voltage and you fry yourself by contact.
The other was is going back over your 12V DC Motors and the PCB, then it will find the ground
and everything is fried. So you need a cabel from the ground of the power supply to the frame,
that you have a security of shutoff with the FI.