Introduction
The SINOTIMER MS-50-24 is a compact and efficient 50W switching power supply designed to convert alternating current (AC) input to a stable 24V direct current (DC) output at 2.1A. This mini-sized unit is suitable for various applications, particularly those involving LED lighting, and offers essential protection features to ensure reliable operation. This manual provides detailed instructions for the safe and effective use of your power supply.
Safety Information
- Ensure the input voltage switch is set correctly (110V or 220V) before connecting to the AC power source. Incorrect setting can cause damage to the unit.
- All wiring should be performed by a qualified professional to prevent electrical shock or fire hazards.
- Do not operate the power supply in wet or damp conditions.
- Ensure proper ventilation around the unit; do not cover ventilation holes.
- Disconnect power before making any adjustments or connections.
- This unit is designed for indoor use only.
Setup
Package Contents
- 1x MS-50-24 (50W, 24V) Switching Power Supply
Mounting
The power supply is designed for fixed installation. Ensure it is mounted in a location that allows for adequate air circulation, as it relies on free air convection for cooling. Refer to the dimensions in the specifications section for planning your installation space.
Input Voltage Selection
Before connecting the power supply to an AC source, verify the input voltage selector switch. This small red switch is located near the AC input terminals (L, N). Set it to either 110V or 220V to match your local mains voltage. Incorrect selection will damage the unit.
Wiring Connections
Refer to the wiring diagram below for proper connection of the AC input and DC output. Use appropriate gauge wires for your application.
- AC Input: Connect the Live (L) and Neutral (N) wires from your AC power source to the corresponding 'L' and 'N' terminals. Connect the Frame Ground (FG) wire to the ground symbol terminal.
- DC Output: Connect your load to the '+V' and '-V' terminals. Ensure correct polarity. The unit has two '+V' and two '-V' terminals for convenience.
Operating Instructions
Power On
Once all connections are securely made and the input voltage switch is correctly set, apply AC power. The LED indicator on the unit will illuminate, signifying that the power supply is operational.
Output Voltage Adjustment
The MS-50-24 features a DC voltage adjustment (ADJ) potentiometer. This allows for fine-tuning of the output voltage within a specified range (typically ±10% for 24V output). Use a small screwdriver to carefully turn the potentiometer to achieve the desired output voltage. It is recommended to measure the output voltage with a multimeter during adjustment to avoid over-voltage conditions that could damage connected devices.
Maintenance
Cooling
The power supply is cooled by free air convection. Ensure that the ventilation holes are not obstructed and that there is sufficient space around the unit for air to circulate freely. Regularly check for dust accumulation on the casing and clear it to maintain optimal cooling performance.
General Care
Keep the unit clean and dry. Avoid exposing it to extreme temperatures or humidity. Do not attempt to open the casing or repair the unit yourself, as this may void the warranty and pose a safety risk.
Troubleshooting
Protection Mechanisms
The MS-50-24 is equipped with built-in protection features:
- Overload Protection: If the output load exceeds 115%~150% of the rated power, the unit will enter hiccup mode, automatically recovering once the fault condition is removed.
- Short Circuit Protection: In the event of a short circuit, the power supply will protect itself and connected devices. It will automatically recover once the short circuit is resolved.
Common Issues
- No Power/LED Off: Check AC input connections, ensure the input voltage switch is correctly set, and verify the AC power source is active.
- Intermittent Output/Hiccup Mode: This indicates an overload or short circuit condition. Reduce the load or check for short circuits in your wiring.
- Incorrect Output Voltage: Use the ADJ potentiometer to adjust the output voltage. If it cannot be adjusted to the desired level, consult the specifications or contact support.
Specifications
| Category | Parameter | MS-50-5 | MS-50-12 | MS-50-15 | MS-50-24 |
|---|---|---|---|---|---|
| Output | DC voltage | 5V | 12V | 15V | 24V |
| Voltage tolerance | ±2% | ±1% | ±1% | ±1% | |
| Rated current | 10A | 4.2A | 3.4A | 2.1A | |
| Current range | 0~10A | 0~4.2A | 0~3.4A | 0~2.1A | |
| Rated power | 50W | 50.4W | 51W | 50.4W | |
| Ripple&noise | 80mvp-p | 120mvp-p | 120mvp-p | 120mvp-p | |
| DCvoltage ADJ.range | -9%~+10% | ±10% | ±10% | ±10% | |
| Input | Voltage range | 90~132VAC/170~264VAC (selected by switch), 235~373VDC | |||
| Frequency | 47~63HZ | ||||
| AC current | 1.3A/115VAC, 0.65A/230VAC | ||||
| Efficiency | 80% | 82% | 82% | 84% | |
| Inrush current | Cold start current 18A/115VAC, 36A/230VAC | ||||
| Leakage current | < 1mA/240VAC | ||||
| Protection | Overload | Rated output power 115%~150% start over load protection | |||
| Protection type | Hiccup mode, auto-recovery after fault condition is removed | ||||
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| Environment | Working temp, humidity | -10°C ~ +60°C, 20%~90%RH | |||
| Storage temp, humidity | -20°C ~ +85°C, 10%~95%RH non-condensing | ||||
| Withstand vibration | 10~500HZ, 2G 10min/1cycle, period for 60 minutes, each axes | ||||
| Safety | Withstand voltage | I/P-O/P:1.5KVAC I/P-FG:1.5KVAC O/P-FG:0.5KVAC | |||
| Isolated resistance | I/P-O/P, I/P-FG, O/P-FG: 100M ohms/500VDC | ||||
| Fitstandard | Safety standard | Fit UL1012 | |||
| EMC standard | EN55022, CLASSA | ||||
| Others | Dimension | 111*78*36mm (L*W*H) | |||
| Weight/packing | 0.26kg/50pcs/ 14kg/0.027 m³/0.96CUFT | ||||
| Note |
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User Tips
No specific user tips were available from provided customer reviews or Q&A. However, general best practices for switching power supplies include:
- Always double-check your wiring before applying power to prevent damage to the power supply or connected devices.
- If using for sensitive electronics, consider adding an external fuse on the DC output for additional protection.
- For long-term reliability, operate the power supply within 80% of its maximum rated load.
Warranty and Support
This product includes a factory warranty. The warranty does not cover items that have been abused, burned, or damaged in any form. For any issues or support inquiries, please contact the seller or manufacturer directly. A detailed user manual in PDF format may be available for download from the manufacturer's website or by contacting customer support.