How to Use MW LRS-350-48: Examples, Pinouts, and Specs

The MW LRS-350-48 is a high-efficiency, enclosed switching power supply unit (PSU) that delivers a consistent 48V DC output. With a power rating of 350 watts, it is designed to be versatile for use in a wide range of industrial and commercial electronic applications. Common applications include automation machinery, industrial control systems, mechanical and electrical equipment, and LED displays.

• Model: MW LRS-350-48
• Power Rating: 350W
• Output Voltage: 48V DC
• Output Current: 7.3A
• Input Voltage Range: 110-240V AC
• Frequency Range: 47-63Hz
• Efficiency: >89%
• Operating Temperature: -25°C to +70°C
• Dimensions: 215 x 115 x 30 mm (L x W x H)
• Certifications: UL, CE, CB, TUV

1. Wiring AC Input: Connect the AC live and neutral wires to pins 1 and 2, respectively. Ensure that the input voltage matches the PSU's specifications.
2. Grounding: Connect the frame ground (FG) to the earth ground of your system to prevent electrical shocks and interference.
3. DC Output: Connect your load to the V+ and V- terminals (pins 4 and 5). Ensure that the load does not exceed the PSU's maximum current rating of 7.3A.
4. Adjusting Output Voltage: If necessary, fine-tune the output voltage using the +V ADJ potentiometer (pin 6).

• Always disconnect power before making any connections to the PSU.
• Use appropriate wire gauges for AC input and DC output to handle the current without overheating.
• Ensure proper ventilation around the PSU for cooling, and do not cover the ventilation holes.
• Protect the PSU from dust and moisture to prevent short circuits and other failures.

• No Output Voltage: Check AC input connections and ensure the PSU is receiving power. Verify that the output terminals are correctly connected.
• Voltage Fluctuations: Ensure that the load does not exceed the PSU's capacity. Check for loose connections and inspect the +V ADJ potentiometer for proper adjustment.
• Overheating: Make sure there is adequate ventilation. Check if the ambient temperature is within the operating range.

Q: Can the MW LRS-350-48 be used with an Arduino UNO? A: Yes, but a voltage regulator or buck converter is needed to step down the voltage to 5V or 3.3V suitable for the Arduino.

Q: Is it possible to adjust the output voltage below 48V? A: Yes, the output voltage can be fine-tuned using the +V ADJ potentiometer.

Q: What is the warranty period for the MW LRS-350-48? A: The warranty period may vary. Please check with the manufacturer or distributor for the specific terms.

To use the MW LRS-350-48 with an Arduino UNO, you will need a DC-DC buck converter to step down the voltage to 5V. Below is a sample code snippet to read an analog sensor connected to the Arduino powered by the PSU through a buck converter.

// Define the sensor pin
const int sensorPin = A0;

void setup() {
  // Initialize serial communication at 9600 baud rate
  Serial.begin(9600);
}

void loop() {
  // Read the sensor value
  int sensorValue = analogRead(sensorPin);
  
  // Convert the reading to voltage
  float voltage = sensorValue * (5.0 / 1023.0);
  
  // Print the voltage to the Serial Monitor
  Serial.println(voltage);
  
  // Wait for a bit to avoid spamming the Serial Monitor
  delay(500);
}

Remember to adjust the buck converter to output 5V before connecting it to the Arduino UNO's 5V pin. Always ensure that the connections are secure and that the input/output ratings are respected to prevent damage to the Arduino or other components.