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 control systems, building automation, and other applications requiring a dependable 12V power source in a compact form factor.

• Industrial automation and control systems
• Building automation (e.g., HVAC, lighting control)
• Security systems and surveillance equipment
• Communication devices
• Embedded systems requiring a 12V DC power source

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 onto a DIN rail (TS-35/7.5 or TS-35/15).
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.
   • Ensure the load does not exceed the maximum output current of 2.5A.
4. Power On:
   • After verifying all connections, power on the AC input.
   • The HDR-30-12 will provide a stable 12V DC output.

• Ventilation: Ensure adequate ventilation 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: Proper grounding is recommended to ensure safety and reduce electrical noise.
• Testing: Before connecting sensitive equipment, verify the output voltage using a multimeter.

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

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 properly connected to an AC power source.

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

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

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an 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:

   • Cause: Incorrect input wiring or no AC input.
   • Solution: Verify the AC input connections and ensure the input voltage is within the specified range.

2. Output Voltage Drops Under Load:

   • Cause: Load exceeds the maximum output current (2.5A).
   • Solution: Reduce the load to within the rated current limit.

3. Overheating:

   • Cause: Insufficient ventilation or operation in high-temperature environments.
   • Solution: Ensure proper ventilation and operate within the specified temperature range (-30°C to +70°C).

4. Intermittent Operation:

   • Cause: Loose connections or unstable input voltage.
   • Solution: Check all connections and ensure a stable AC input.

Q1: Can the HDR-30-12 be used with DC input?
Yes, the HDR-30-12 supports a DC input 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 only be used in indoor environments or within a protective enclosure.

Q3: Can I adjust the output voltage?
No, the HDR-30-12 provides a fixed 12V DC output and does not have an adjustable voltage feature.

Q4: What happens if the load exceeds 2.5A?
The HDR-30-12 is equipped with overload protection. If the load exceeds 2.5A, the power supply will enter protection mode to prevent damage.

Q5: Is the HDR-30-12 compatible with other DIN rail-mounted devices?
Yes, the HDR-30-12 is designed for standard DIN rail mounting and can be used alongside other DIN rail-mounted devices.