How to Use Meanwell ELG-300-24A: Examples, Pinouts, and Specs

The Meanwell ELG-300-24A is a high-performance 300W LED driver designed to provide a constant voltage output of 24V. It is ideal for powering LED lighting systems in both indoor and outdoor environments, thanks to its robust IP67-rated enclosure that ensures protection against dust and water ingress. This driver is known for its high efficiency, wide input voltage range, and built-in safety features, making it a reliable choice for various lighting applications.

• Outdoor LED lighting systems (e.g., streetlights, architectural lighting)
• Indoor LED installations (e.g., commercial and industrial lighting)
• Signage and display lighting
• Applications requiring high reliability and environmental protection

The Meanwell ELG-300-24A has input and output wiring connections. Below is the pin configuration:

1. Input Connection:

   • Connect the black wire to the live (L) terminal of the AC mains.
   • Connect the white wire to the neutral (N) terminal of the AC mains.
   • Connect the green/yellow wire to earth ground for safety.

2. Output Connection:

   • Connect the red wire to the positive terminal of the LED load.
   • Connect the black wire to the negative terminal of the LED load.

3. Dimming Control (Optional):

   • For dimming functionality, connect the blue (Dim -) and white (Dim +) wires to a compatible dimming controller (0-10V, PWM, or resistance-based).

4. Power On:

   • Ensure all connections are secure and insulated.
   • Turn on the AC mains power to activate the LED driver.

• Load Matching: Ensure the total power of the connected LED load does not exceed 300W.
• Ventilation: Install the driver in a well-ventilated area to prevent overheating.
• Waterproofing: For outdoor installations, ensure all connections are properly sealed to maintain the IP67 rating.
• Dimming Compatibility: Verify that the dimming controller is compatible with the 3-in-1 dimming interface.
• Safety: Always disconnect power before making any wiring changes.

While the ELG-300-24A is not directly controlled by an Arduino, it can be used with an Arduino to implement dimming functionality. Below is an example of using PWM dimming with the Arduino UNO:

// Example: Controlling the Meanwell ELG-300-24A dimming via PWM
// Connect Arduino PWM pin (e.g., D9) to the Dim(+) wire of the driver
// Connect Dim(-) wire to Arduino GND

const int pwmPin = 9; // PWM pin connected to Dim(+) of the driver

void setup() {
  pinMode(pwmPin, OUTPUT); // Set the PWM pin as an output
}

void loop() {
  // Gradually increase brightness
  for (int brightness = 0; brightness <= 255; brightness++) {
    analogWrite(pwmPin, brightness); // Write PWM signal to dimming input
    delay(10); // Small delay for smooth dimming
  }

  // Gradually decrease brightness
  for (int brightness = 255; brightness >= 0; brightness--) {
    analogWrite(pwmPin, brightness); // Write PWM signal to dimming input
    delay(10); // Small delay for smooth dimming
  }
}

1. No Output Voltage:

   • Cause: Incorrect input wiring or no AC power.
   • Solution: Verify the AC input connections and ensure the mains power is on.

2. LEDs Flickering:

   • Cause: Incompatible dimming controller or unstable input voltage.
   • Solution: Check the dimming controller compatibility and ensure stable AC input.

3. Driver Overheating:

   • Cause: Poor ventilation or excessive load.
   • Solution: Ensure proper ventilation and reduce the load to within the rated 300W.

4. Dimming Not Working:

   • Cause: Incorrect dimming connections or incompatible dimming signal.
   • Solution: Verify the dimming connections and ensure the dimming signal matches the driver’s requirements (0-10V, PWM, or resistance).

1. Can the ELG-300-24A be used outdoors?

   • Yes, the IP67 rating ensures it is suitable for outdoor use.

2. What happens if the load exceeds 300W?

   • The driver’s built-in over-current protection will activate, shutting down the output to prevent damage.

3. Is the driver compatible with all dimming controllers?

   • The driver supports 0-10V, PWM, and resistance-based dimming. Ensure your controller matches one of these methods.

4. Can I use this driver with a 12V LED load?

   • No, the ELG-300-24A provides a constant 24V output and is not suitable for 12V loads. Use a driver with a 12V output instead.