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oscar garcia
oscar garcia
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Can COM and earth be connected in thorugh PCBsthorough the PCB ground pin?

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oscar garcia
oscar garcia
  • 53
  • 4

Can COM and earth be connected in thorugh PCBs?

I'm using an AC/DC switching supply (Meanwell PD-45) with the following schematics:

enter image description here

The Frame Ground (FG) is connected to the metal chassis of my device with a screw. The output of the switching supply is used to power a PCB. Therefore, +5V and COM are connected to the PCB. But the ground of the PCB is in itself also connected to the metal chassis via the mounting screws. Therefore, COM and FG are connected. Is this a good practice? Should the PCBs be kept floating with COM only?