How to Use MW Mean Well UHP-350R-12: Examples, Pinouts, and Specs

The MW Mean Well UHP-350R-12 is a high-performance, 350W power supply designed for industrial applications. It features a compact, fanless design, high efficiency, and a wide input voltage range, making it ideal for powering various electronic devices and systems. This power supply is particularly suited for applications requiring reliable and stable DC power, such as industrial automation, LED lighting, and communication equipment.

• Industrial automation systems
• LED lighting and displays
• Communication equipment
• Test and measurement devices
• Battery charging systems

The MW Mean Well UHP-350R-12 features screw terminal connections for input and output. Below is the pin configuration:

1. Input Connection: Connect the AC input terminals (L and N) to the mains power supply. Ensure the input voltage is within the specified range (90-264V AC).
2. Output Connection: Connect the V+ and V- terminals to the load. Ensure the load does not exceed the maximum output current (29A).
3. Voltage Adjustment: Use the V ADJ potentiometer to fine-tune the output voltage within the adjustable range (10.8V to 13.2V).
4. Grounding: Connect the FG terminal to the earth ground for safety and to reduce electrical noise.

• Cooling: Ensure adequate ventilation around the power supply to maintain proper cooling, as it relies on convection cooling.
• Load Requirements: Do not exceed the maximum output power (348W) to avoid triggering the overload protection.
• Safety: Always disconnect the power supply from the mains before making any connections or adjustments.
• Mounting: Secure the power supply in a well-ventilated area using appropriate mounting hardware.

The MW Mean Well UHP-350R-12 can be used to power an Arduino UNO and other peripherals. Below is an example of how to connect it:

1. Connect the V+ terminal to the Arduino's VIN pin.
2. Connect the V- terminal to the Arduino's GND pin.
3. Ensure the output voltage is set to 12V using the V ADJ potentiometer.

// Example code to blink an LED connected to pin 13 of the Arduino UNO
// Ensure the Arduino is powered by the MW Mean Well UHP-350R-12

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. No Output Voltage

   • Cause: Input power is not connected or is outside the specified range.
   • Solution: Verify the AC input voltage and connections to the L and N terminals.

2. Overload Protection Triggered

   • Cause: The connected load exceeds the maximum output power (348W).
   • Solution: Reduce the load to within the specified limits.

3. Overheating

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

4. Voltage Fluctuations

   • Cause: Loose connections or incorrect adjustment of the V ADJ potentiometer.
   • Solution: Check all connections and adjust the V ADJ potentiometer carefully.

Q1: Can the UHP-350R-12 be used with a 24V system?
A1: No, the UHP-350R-12 is designed for a 12V output. For 24V systems, consider using a different model with a 24V output.

Q2: Is the power supply suitable for outdoor use?
A2: The UHP-350R-12 is not waterproof or weatherproof. It should be used in a dry, indoor environment or within a suitable enclosure.

Q3: Can I use this power supply to charge a 12V battery?
A3: Yes, but ensure the output voltage is properly adjusted to match the battery's charging requirements, and use a charge controller if necessary.

Q4: What happens if the input voltage drops below 90V AC?
A4: The power supply may shut down or operate erratically. Ensure the input voltage remains within the specified range (90-264V AC).