Power supply commons

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Craig
Posts: 18
Joined: Tue Nov 24, 2020 9:34 pm
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CNC Control System Serial Number: A900928

Power supply commons

Post by 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


Am I supposed to connect those 3?
cncsnw
Posts: 1878
Joined: Wed Mar 24, 2010 5:48 pm

Re: Power supply commons

Post by 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
Posts: 18
Joined: Tue Nov 24, 2020 9:34 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: A900928

Re: Power supply commons

Post by Craig »

cncsnw wrote: Sat Feb 20, 2021 2:13 pm 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
Posts: 1878
Joined: Wed Mar 24, 2010 5:48 pm

Re: Power supply commons

Post by cncsnw »

No.
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