1. Introduction
This manual provides essential information for the safe and efficient operation of the MEAN WELL LRS-350-24 Single Output Switchable Power Supply. Please read this manual thoroughly before installation and use.
Figure 1: MEAN WELL LRS-350-24 Power Supply. This image shows the enclosed power supply unit with its ventilation grille, terminal block, and model label.
2. Safety Information
- Ensure proper grounding to prevent electrical shock.
- Do not operate the unit in wet or damp conditions.
- Verify input voltage selection switch (115VAC/230VAC) is set correctly before connecting to power. Incorrect setting can cause damage.
- Installation should be performed by qualified personnel.
- Do not open the power supply casing; there are no user-serviceable parts inside.
- Ensure adequate ventilation to prevent overheating.
- Disconnect power before performing any maintenance or wiring changes.
3. Product Overview
3.1 Features
- AC input range selectable by a switch.
- Withstands 300 VAC surge input for 5 seconds.
- No load power consumption below 0.75W.
- 1U low profile design.
- High operating temperature, up to 70°C.
- Protections: Short circuit, Overload, Over voltage, Over temperature.
- Built-in cooling fan with ON-OFF control.
- Compliance to UL 60950-1.
- Withstands 5G vibration test.
- High efficiency, long life, and high reliability.
- LED indicator for power on status.
- 100% full load burn-in test.
- 3-year warranty.
3.2 Applications
- Industrial automation machinery.
- Industrial control systems.
- Mechanical and electrical equipment.
- Electronic instruments, equipment, or apparatus.
Figure 2: Overview of LRS-350 series features and typical applications. This image displays a summary of the power supply's capabilities and suitable uses.
4. Setup and Installation
4.1 Pre-Installation Check
Before installation, ensure the power supply is undamaged and that all necessary components are available. Verify the input voltage requirement of your application matches the power supply's capabilities.
4.2 AC Input Voltage Selection
The LRS-350-24 features an AC input range selectable by a switch. Locate the switch on the side of the unit. Set it to either 115VAC (for 90-132VAC input) or 230VAC (for 180-264VAC input) according to your local mains voltage. Failure to set this correctly can result in damage to the unit.
4.3 Wiring Connections
Connect the power supply using the screw terminal block. Refer to the mechanical specification diagram for terminal assignments.
- AC Input: Connect Live (L), Neutral (N), and Ground (FG) to the corresponding input terminals.
- DC Output: Connect the positive (+) and negative (-) load wires to the DC OUTPUT terminals.
Figure 3: Mechanical dimensions and terminal block assignments for the LRS-350 series. This diagram provides physical measurements and pinout details for wiring.
4.4 Mounting
Mount the power supply in a location that allows for adequate airflow around the unit, especially near the cooling fan. Use appropriate screws and mounting points as indicated in the mechanical specification diagram.
5. Operating Instructions
5.1 Power On
After ensuring all connections are secure and the AC input voltage switch is correctly set, apply AC power. The LED indicator on the unit will illuminate, indicating that the power supply is operational.
5.2 Output Voltage Adjustment
The output voltage can be finely adjusted using the potentiometer located near the output terminals. Use a small screwdriver to carefully turn the potentiometer to achieve the desired output voltage within the specified range (typically 21.6V to 28.8V for the 24V model).
5.3 Cooling Fan Operation
The built-in cooling fan operates with ON-OFF control, activating automatically when the internal temperature reaches a certain threshold to maintain optimal operating conditions. It will turn off when the temperature drops.
6. Maintenance
The LRS-350-24 power supply is designed for long-term reliability with minimal maintenance. However, periodic checks can help ensure optimal performance.
- Cleaning: Ensure ventilation openings are free from dust and debris. Use a soft, dry cloth or compressed air to clean the exterior. Do not use liquid cleaners.
- Connections: Periodically check all wiring connections to ensure they remain tight and secure.
- Environment: Maintain the operating environment within specified temperature and humidity ranges to prolong the unit's lifespan.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No output voltage / LED off |
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| Output voltage too low or unstable |
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| Fan is loud or constantly running |
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8. Specifications
Detailed electrical and mechanical specifications for the MEAN WELL LRS-350-24 power supply.
Figure 4: Comprehensive specification table for the LRS-350 series, including input, output, protection, and environmental data.
| Parameter | Value |
|---|---|
| Model | LRS-350-24 |
| Primary Output Voltage (VDC) | 24 |
| Output Current (A) | 14.6 |
| Maximum Output Power (W) | 350.4 |
| Input Voltage (VAC) | 90 to 132 / 180 to 264 (selectable) |
| Input Frequency (Hz) | 47 to 63 |
| Maximum Input Current (A) | 6.8 |
| Output Connector Type | Screw Terminal Block |
| Number of Outputs | 1 |
| Form Factor | Enclosed |
| Product Dimensions (L x W x H) | 8.46 x 1.18 x 4.53 inches |
| Item Weight | 1.64 pounds |
| Cooling Method | Air (Built-in fan) |
| Operating Temperature | Up to 70°C |
| Protections | Short circuit, Overload, Over voltage, Over temperature |
| Compliance | UL 60950-1 |
| Warranty | 3 years |
Figure 5: Block diagram illustrating the internal structure and performance curves (derating, static characteristics) of the LRS-350 series.
9. Warranty and Support
The MEAN WELL LRS-350-24 power supply comes with a 3-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
For technical support, warranty claims, or service inquiries, please contact your authorized MEAN WELL distributor or reseller. Do not attempt to repair the unit yourself, as this will void the warranty and may pose safety risks.
