QJ-PS30SWI DC Power Supply User Manual

1. Introduction

The DSUNYK QJ-PS30SWI is a high-efficiency, compact, lightweight, and high-performance switching power supply. It is specifically engineered to minimize noise, particularly for communication applications. Should noise occur, it can be effectively eliminated using the Noise Offset control. This power supply includes convenient features such as a voltage preset knob and a highly visible backlit meter, making it a versatile and user-friendly device.

2. Package Contents

Please check the package for the following items:

• QJ-PS30SWI Switching Power Supply Unit
• Instruction Manual
• Power Cord

3. Product Overview

Familiarize yourself with the components and controls of your QJ-PS30SWI power supply.

Front Panel Controls and Indicators:

• Power Switch (ON/OFF): Toggles the power supply on or off.
• Power Indicator: Illuminates when the unit is powered on.
• Voltage/Current Indicating Switch (Meter): Selects between displaying output voltage (V) or current (A) on the meter.
• Voltage and Current Indicator (Meter): A backlit analog meter displaying either voltage or current, depending on the Meter switch setting.
• Noise Canceling Knob (Noise Offset): Adjusts to minimize noise, especially useful in communication environments.
• 10A Cigarette Lighter Output (MAX 10A): Provides a 10A DC output via a standard cigarette lighter socket.

Rear Panel Components:

• Cooling Fan: Ensures proper ventilation and prevents overheating.
• Fuse: Provides overcurrent protection for the input. (220V: 5A)
• Input Power Socket: For connecting the AC power cord (220VAC 50Hz).
• 13.8V/30A Output Interface: Dual-purpose terminal sockets (red for positive, black for negative) for connecting devices requiring up to 30A. These can be used with copper nose or banana head power cords.

4. Setup Instructions

1. Placement: Place the unit in a dry and well-ventilated area to ensure proper cooling.
2. Power Connection: Ensure the power switch on the front panel is in the "OFF" position. Connect the provided AC power cord to the input power socket on the rear panel and then plug it into a 220VAC 50Hz wall outlet.
3. Device Connection:
   • For devices requiring up to 10A, use the 10A cigarette lighter output on the front panel.
   • For devices requiring up to 30A, connect your device's power cable to the 13.8V/30A output interface on the rear panel. Ensure correct polarity: red terminal for positive (+), black terminal for negative (-). Use appropriate copper nose or banana head power cords for secure connection.
4. Initial Check: Double-check all connections before powering on the unit.

5. Operating Instructions

1. Power On: Flip the Power switch on the front panel to the "ON" position. The Power indicator light will illuminate.
2. Monitor Output: Use the Voltage/Current Indicating Switch (Meter) to toggle between displaying the output voltage (V) or current (A) on the backlit analog meter. The power supply provides a fixed output voltage of 13.8VDC.
3. Noise Reduction: If you experience noise, particularly in communication setups, adjust the Noise Canceling Knob (Noise Offset) to minimize it.
4. Power Off: When finished, turn off the connected device first, then flip the Power switch on the power supply to the "OFF" position.

6. Specifications

7. Safety Precautions and Cautions

Please read and adhere to the following safety guidelines to ensure safe operation and prevent damage to the unit or connected equipment:

• Even though the chassis of the unit is negatively grounded, always use correct terminals to connect cables, ensuring proper polarity.
• When plugging the unit into a wall outlet, ensure the power switch is in the "OFF" position.
• Place the unit in a dry and well-ventilated area to prevent overheating.
• Never touch the unit while it is working. Although designed for high efficiency, the unit may still get warm.
• A current limiting system is integrated to protect the unit from overloading.
• If a short circuit occurs during operation, the unit's short-circuit protection function will activate. Turn off the unit immediately, identify and repair the cause of the short circuit, then turn it back on.
• Do not use the unit for devices that require high current input at startup, such as motorized equipment, as this can exceed the unit's surge capacity.
• Do not use the unit to charge a car battery.
• Do not insert a car cigarette lighter into the cigarette plug output; this port is for powering devices, not for igniters.

8. Maintenance

• Cleaning: Disconnect the power supply from the main power outlet before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or aerosols.
• Ventilation: Ensure the cooling fan and ventilation openings on the rear panel are free from dust and obstructions. Regularly check for any build-up that might impede airflow.
• Storage: When not in use for extended periods, store the power supply in a cool, dry place, away from direct sunlight and extreme temperatures.
• Fuse Replacement: If the unit fails to power on, check the fuse on the rear panel. If it is blown, replace it with a fuse of the same type and rating (220V: 5A). Always disconnect the power cord before attempting fuse replacement.

9. Troubleshooting

10. User Tips

• Current Limits: While the power supply has a maximum output of 30A, it is designed for continuous operation at 20A. For amateur radio or other demanding applications, ensure your equipment's continuous current draw does not exceed 20A to ensure longevity and stable performance.
• Input Voltage: This model is designed for 220VAC 50Hz input. Ensure your power source matches this specification.

11. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.