1. Introduction
The AzarPixel Mean Well LRS-350-5 is an enclosed 300W 5V AC/DC power supply designed for various applications requiring stable and efficient power. This unit converts alternating current (AC) to direct current (DC) at 5 volts, making it suitable for industrial automation, LED lighting, and audio/video equipment. It features high efficiency, an adjustable output voltage, a built-in cooling fan, wide input voltage compatibility, and comprehensive protection mechanisms to ensure reliable operation.
Figure 1: AzarPixel Mean Well LRS-350-5 Power Supply
2. Safety Information
WARNING: Improper installation or operation can lead to electric shock, fire, or damage to the unit and connected equipment. Always ensure power is disconnected before making any connections or adjustments.
- Input Voltage Selection: Before connecting the power supply to an AC source, verify that the input voltage selector switch (located on the side of the unit) is set to the correct voltage (115V or 230V) corresponding to your local power grid. Incorrect selection can cause severe damage to the unit.
- Grounding: Ensure the unit is properly grounded to prevent electric shock.
- Ventilation: Provide adequate ventilation around the power supply to prevent overheating. Do not block the cooling fan or ventilation openings.
- Environment: Avoid operating the unit in environments with excessive moisture, dust, or extreme temperatures.
- Professional Installation: Installation should be performed by qualified personnel familiar with electrical wiring and safety standards.
Figure 2: AC Input Voltage Selector Switch (ensure correct setting before power-on)
3. Features
- High Efficiency (Up to 89.1%): Delivers optimal performance with minimal energy loss, suitable for energy-conscious applications.
- Adjustable Output Voltage (4.5-5.5V): Allows fine-tuning of the power output for precision in various systems.
- Built-in Cooling Fan with Smart ON-OFF Control: Ensures reliable operation by automatically activating at 50°C and deactivating below 40°C.
- Wide Input Voltage Range (100-120VAC / 200-240VAC): Compatible with global power grids, eliminating the need for additional converters.
- Comprehensive Protections: Includes over-temperature, over-voltage, over-current, and short-circuit protections for safe and reliable operation.
4. Setup and Connections
Follow these steps for proper installation and connection of your LRS-350-5 power supply.
Video 1: Overview of Mean Well LRS-350-5 connections and voltage selector.
- Input Voltage Selection:
Locate the red switch on the side of the unit (refer to Figure 2). Set it to either 115V or 230V according to your region's AC mains voltage. Failure to do so can damage the unit upon power-up.
- AC Input Wiring:
Connect your AC mains power cable to the input terminal block. Ensure correct polarity:
- L (Line): Connect to the live wire.
- N (Neutral): Connect to the neutral wire.
- ⏚ (Ground): Connect to the protective earth ground wire.
Tighten all screw terminals securely to prevent loose connections.
- DC Output Wiring:
Connect your load (e.g., LED strips, controllers) to the DC output terminal block. The unit provides multiple positive (+) and negative (-) terminals for convenience.
- +V: Connect to the positive input of your load.
- -V: Connect to the negative input of your load.
Ensure correct polarity and secure connections. It is recommended to use appropriate wire gauges for the current draw of your load.
- Output Voltage Adjustment:
A small potentiometer labeled V.ADJ is located near the DC output terminals. This allows for fine adjustment of the output voltage within the range of 4.5V to 5.5V. Use a small screwdriver to carefully turn the potentiometer to achieve the desired output voltage. It is advisable to measure the output voltage with a multimeter during adjustment.
- Mounting:
Mount the power supply in a location that allows for adequate airflow around the unit, especially around the cooling fan and ventilation slots. Avoid enclosed spaces that could trap heat.
Figure 3: Input and Output Terminal Connections
5. Operating Instructions
Once the power supply is correctly wired and the input voltage selector is set, you can power on the unit.
- Power On: Apply AC power to the input terminals. The power supply will begin to operate, providing 5V DC output.
- Cooling Fan Operation: The built-in cooling fan operates automatically. It will activate when the internal temperature reaches approximately 50°C and will turn off when the temperature drops below 40°C. This smart control ensures efficient cooling only when needed, reducing noise and extending fan life.
- Output Voltage Monitoring: Periodically check the output voltage, especially if precise voltage is critical for your application. Adjust using the V.ADJ potentiometer if necessary.
6. Maintenance
To ensure long-term reliability and optimal performance of your LRS-350-5 power supply, follow these maintenance guidelines:
- Keep Clean: Regularly clean the exterior of the unit, especially the ventilation openings and fan, to prevent dust buildup. Use a soft, dry cloth. Do not use liquid cleaners.
- Ensure Ventilation: Periodically check that the cooling fan and all ventilation slots are unobstructed. Proper airflow is essential for heat dissipation.
- Check Connections: Occasionally inspect all input and output wiring connections to ensure they remain tight and secure. Loose connections can lead to poor performance or safety hazards.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges.
7. Troubleshooting
If you encounter issues with your LRS-350-5 power supply, refer to the following troubleshooting tips:
- No Output Power:
- Verify that the AC input voltage selector switch is set correctly (115V or 230V).
- Check the AC input power source and connections (L, N, Ground).
- Ensure the DC output connections are correct and not short-circuited.
- Confirm that the load is not exceeding the maximum current rating (60A).
- Incorrect Output Voltage:
- Use a multimeter to measure the output voltage.
- Adjust the V.ADJ potentiometer to fine-tune the output voltage to the desired 5V.
- Overheating/Fan Constantly Running:
- Check for any obstructions to the cooling fan or ventilation openings.
- Ensure the power supply is not overloaded; reduce the connected load if necessary.
- Verify that the ambient temperature is within the specified operating range.
- Unit Shuts Down:
- This may indicate activation of protection features (over-temperature, over-voltage, over-current, short-circuit).
- Disconnect power, inspect for faults (e.g., short circuits in the load), correct the issue, and then reapply power.
8. Specifications
Below are the key technical specifications for the Mean Well LRS-350-5 power supply:
Figure 4: Detailed Specifications for LRS-350 Series (LRS-350-5 highlighted)
| Parameter | Value |
|---|---|
| Model | LRS-350-5 |
| DC Voltage | 5V |
| Rated Current | 60A |
| Rated Power | 300W |
| Ripple & Noise (max.) | 150mVp-p |
| Voltage Adj. Range | 4.5 - 5.5V |
| Voltage Tolerance | ±2.0% |
| Input Voltage Range | 90 ~ 132VAC / 180 ~ 264VAC by switch (selectable) |
| Frequency Range | 47 ~ 63Hz |
| Efficiency (Typ.) | 89.1% |
| AC Current (Typ.) | 6.8A/115VAC, 3.4A/230VAC |
| Protections | Overload, Over Voltage, Over Temperature, Short Circuit |
| Fan Control | ON: 50°C, OFF: 40°C |
| Working Temperature | -25 ~ +70°C |
| Dimensions (L x W x H) | 215 x 115 x 30 mm (8.46 x 4.53 x 1.18 inches) |
| Weight | 0.78 kg (1.72 lbs) |
For more detailed specifications and technical data, please refer to the official Mean Well datasheet: Mean Well LRS-350 Series Datasheet
9. Warranty and Support
The AzarPixel Mean Well LRS-350-5 power supply is backed by a 3-year warranty, ensuring peace of mind regarding its quality and reliability.
For technical support, warranty claims, or further inquiries, please contact AzarPixel customer service through the platform of purchase or refer to the official Mean Well website for product documentation and support resources.