Power Supply

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Radonix control boards connect to the power supply via a 3-pin connector.
The +24 V pin must be tied to the positive rail, and the GND pins to the negative rail. There are two GND pins—both are common internally—so you only need to connect the negative rail to either one.

The board’s positive input is diode-protected against reverse polarity. The simplified schematic of the input protection circuit is shown below:

• Supply voltage: 12 – 24 V DC
• Typical current draw: ~0.5 A
• Recommended PSU: A regulated switch-mode supply (24 V) to minimize the effect of line fluctuations.

Calculating Required PSU Current

Sum the current draw of the control board plus all connected devices. For example, if your panel has:

• 4 relays (0.1 A each)
• 3 pneumatic valves (0.25 A each)
• 1 Radonix control board (0.5 A)

Then:

Total current = 0.5 A (board) + 4 × 0.1 A (relays) + 3 × 0.25 A (valves)
= 0.5 A + 0.4 A + 0.75 A = 1.65 A

Choosing a 2 A supply provides a safety margin.

For high-load devices (e.g., servo brakes, solenoid valves), measure each component’s resistance R with an ohmmeter, then calculate current I using Ohm’s law: