How to Use HDR-30-12 Power Supply DIN Rail: Examples, Pinouts, and Specs

The HDR-30-12 is a compact and reliable power supply unit manufactured by Mean Well. Designed for DIN rail mounting, it delivers a stable 12V DC output with a maximum current of 2.5A. This power supply is ideal for industrial and automation applications, offering high efficiency, low power consumption, and a slim form factor that saves space in control panels.

• Industrial automation systems
• Building automation and control
• Security and surveillance systems
• LED lighting systems
• Communication equipment
• General-purpose DC power supply for electronics projects

The following table outlines the key technical specifications of the HDR-30-12 power supply:

The HDR-30-12 features screw terminal connections for input and output. The pin configuration is as follows:

1. Mounting: Securely mount the HDR-30-12 on a DIN rail (TS-35/7.5 or TS-35/15) in your control panel or enclosure.
2. Input Connection:
   • Connect the AC line (L) and neutral (N) wires to the input terminals.
   • Ensure the input voltage is within the specified range (85-264 VAC).
3. Output Connection:
   • Connect the load to the +V and -V output terminals.
   • Verify that the total load does not exceed the maximum output current of 2.5A.
4. Power On:
   • After verifying all connections, power on the AC input to activate the power supply.
   • Measure the output voltage to confirm it is 12V DC before connecting sensitive devices.

• Ventilation: Ensure adequate airflow around the power supply to prevent overheating.
• Load Requirements: Do not exceed the maximum output current (2.5A) to avoid triggering overload protection.
• Wiring: Use appropriately rated wires for both input and output connections.
• Grounding: Properly ground the power supply to reduce electrical noise and improve safety.
• Environmental Conditions: Operate the power supply within the specified temperature range (-30°C to +70°C).

The HDR-30-12 can be used to power an Arduino UNO and other peripherals. Below is an example wiring and code snippet:

1. Connect the +V terminal of the HDR-30-12 to the VIN pin of the Arduino UNO.
2. Connect the -V terminal of the HDR-30-12 to the GND pin of the Arduino UNO.
3. Ensure the HDR-30-12 is powered by an appropriate AC input.

// Example code to blink an LED using Arduino UNO powered by HDR-30-12
// Ensure the HDR-30-12 is providing 12V DC to the Arduino's VIN pin.

const int ledPin = 13; // Built-in LED pin on Arduino UNO

void setup() {
  pinMode(ledPin, OUTPUT); // Set LED pin as output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);               // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);               // Wait for 1 second
}

1. No Output Voltage:

   • Verify that the AC input voltage is within the specified range (85-264 VAC).
   • Check the wiring connections for loose or incorrect terminals.
   • Ensure the load does not exceed the maximum output current (2.5A).

2. Overheating:

   • Ensure proper ventilation around the power supply.
   • Check for excessive load or short circuits on the output.

3. Output Voltage Fluctuations:

   • Verify that the input voltage is stable and within range.
   • Check for loose connections or damaged wires.

4. Power Supply Not Turning On:

   • Confirm that the AC input is live and properly connected.
   • Inspect the power supply for visible damage or faults.

Q1: Can the HDR-30-12 be used with DC input?
Yes, the HDR-30-12 supports DC input in the range of 120-370 VDC.

Q2: Is the HDR-30-12 suitable for outdoor use?
No, the HDR-30-12 is not weatherproof and should be used in a dry, indoor environment.

Q3: Can I use the HDR-30-12 to power multiple devices?
Yes, as long as the total current draw does not exceed 2.5A.

Q4: What happens if the load exceeds 2.5A?
The power supply's overload protection will activate, shutting down the output to prevent damage.

Q5: How do I reset the power supply after overload protection is triggered?
Remove the excessive load, then cycle the AC input power off and on to reset the unit.