How to Use MEAN WELL DRS-240-48: Examples, Pinouts, and Specs

The MEAN WELL DRS-240-48 is a high-performance 240W, 48V DC-DC power supply designed for industrial applications. It offers high efficiency, a compact form factor, and robust protection features, making it ideal for powering sensitive electronic equipment in demanding environments. This power supply is widely used in industrial automation, telecommunications, and control systems where reliable and stable power delivery is critical.

• Industrial automation systems
• Telecommunications equipment
• Control panels and PLCs
• Battery charging systems
• LED lighting systems

The DRS-240-48 features screw terminal connections for input and output. Below is the pin configuration:

1. Mounting: Secure the DRS-240-48 in a well-ventilated area to ensure proper heat dissipation. Use the mounting holes provided on the unit.
2. Input Connection: Connect the AC input terminals (L and N) to the mains power supply. Ensure the earth (FG) is properly grounded for safety.
3. Output Connection: Connect the +V and -V terminals to the load. Ensure the load does not exceed the rated 240W output power.
4. Voltage Adjustment: If required, use the Trim pin to fine-tune the output voltage. Refer to the datasheet for the adjustment range.
5. Control Signal: Use the DC OK pin to monitor the power status. This pin can be connected to a microcontroller or PLC for system monitoring.

• Input Voltage: Ensure the input voltage is within the specified range (90-264 VAC or 127-370 VDC).
• Load Requirements: Do not exceed the maximum output power of 240W to avoid triggering the overcurrent protection.
• Ventilation: Maintain adequate airflow around the unit to prevent overheating.
• Wiring: Use appropriately rated wires for both input and output connections to handle the current safely.
• Safety: Always disconnect the power supply before making any wiring changes.

The DRS-240-48 can be used to power an Arduino UNO by stepping down the 48V output to 5V using a DC-DC buck converter. Below is an example of how to monitor the DC OK signal with the Arduino:

// Arduino code to monitor the DC OK signal from the DRS-240-48
const int dcOkPin = 2; // Connect DC OK pin to Arduino digital pin 2

void setup() {
  pinMode(dcOkPin, INPUT); // Set DC OK pin as input
  Serial.begin(9600);      // Initialize serial communication
}

void loop() {
  int dcOkStatus = digitalRead(dcOkPin); // Read the DC OK signal
  if (dcOkStatus == HIGH) {
    Serial.println("Power supply is OK."); // Print status if power is stable
  } else {
    Serial.println("Power supply issue detected!"); // Print warning if unstable
  }
  delay(1000); // Wait 1 second before checking again
}

1. No Output Voltage

   • Cause: Input power is not connected or is outside the specified range.
   • Solution: Verify the input voltage and connections. Ensure the mains power is within the specified range.

2. Overcurrent Protection Triggered

   • Cause: Load exceeds the maximum output power of 240W.
   • Solution: Reduce the load to within the rated power capacity.

3. Overheating

   • Cause: Insufficient ventilation or operation in a high-temperature environment.
   • Solution: Improve airflow around the unit and ensure ambient temperature is within the operating range.

4. DC OK Signal Not Working

   • Cause: Incorrect wiring or damaged signal pin.
   • Solution: Check the wiring and ensure the DC OK pin is properly connected to the monitoring device.

Q: Can the DRS-240-48 be used with a battery system?
A: Yes, it can be used to charge batteries, but ensure the output voltage and current are compatible with the battery specifications.

Q: How do I adjust the output voltage?
A: Use the Trim pin to adjust the output voltage. Refer to the datasheet for the adjustment range and procedure.

Q: Is the DRS-240-48 suitable for outdoor use?
A: The unit is not weatherproof. If outdoor use is required, it must be installed in a weatherproof enclosure.

Q: What is the warranty period for the DRS-240-48?
A: Warranty terms vary by region. Refer to the manufacturer's documentation or contact your supplier for details.