Control Panels

Control power supply

Definition

The panel component converting incoming power to the DC voltage, usually 24 V, that the controller, I/O, and field devices run on.

Size it on total steady-state load plus the largest simultaneous inrush, add at least 25% headroom, then derate for the real maximum ambient. An undersized supply produces intermittent resets that are very hard to diagnose.

How to Size a Control Panel Power SupplyAdd up the real load, account for inrush and simultaneity, add headroom, and check the heat you just added to the enclosure.

Control power supply

Definition

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