Power supply commons

[Craig]

On one of the Centroid YouTube videos it say something like “Need to connect the commons of the power supplys.”

I have a Vfd, centroid power supply and this
https://www.amazon.com/dp/B01HPJT7C0/re ... B01HPJT7C0

Am I supposed to connect those 3?

[cncsnw]

No. They are talking about the 0V (COM) outputs of the AC-to-DC switching power supplies.

What you have pictured is a transformer (AC-to-AC), which would only be used for contactor coils. It does not need a shared common with the DC supplies.

[Craig]

No. They are talking about the 0V (COM) outputs of the AC-to-DC switching power supplies.

What you have pictured is a transformer (AC-to-AC), which would only be used for contactor coils. It does not need a shared common with the DC supplies.

My Vfd and centroid power supply are AC to DC, should those commons be connected?

[cncsnw]

No.