1. Introduction
Thank you for choosing the KUAIQU Adjustable Lab DC Power Supply. This device is a professional switching power supply regulation unit designed for various applications including electronics repair, laboratory experiments, battery charging, and more. It features a high-resolution 4-digit LED display, output switch control, and multiple safety protections. This manual provides essential information for the safe and efficient operation of your power supply.
2. Safety Information
Your safety is paramount. Please read and understand all safety instructions before operating the device. Failure to do so may result in injury or damage to the equipment.
- All KUAIQU lab power supplies are CE & FCC certified, ensuring compliance with safety standards.
- The device is built with multiple protection functions: leakage protection, grounding terminal, over-voltage protection, over-current protection, over-power protection, over-load protection, over-temperature protection, and short-circuit protection.
- Always ensure proper grounding when connecting the power supply.
- Do not operate the power supply in wet or damp conditions.
- Avoid blocking the ventilation openings to prevent overheating.
- Before making any connections or disconnections, ensure the output is turned off using the OUTPUT (ON/OFF) button.
3. Product Overview
The KUAIQU DC Power Supply is designed for precision and ease of use. Below are the main components and features:
3.1 Front Panel Layout
- Voltage Display: Shows the output voltage in Volts (V).
- Current Display: Shows the output current in Amperes (A).
- Power Display: Shows the output power in Watts (W).
- Constant Voltage (C.V.) Indicator: Lights up when the power supply is operating in constant voltage mode.
- Constant Current (C.C.) Indicator: Lights up when the power supply is operating in constant current mode.
- Encoder Knob (CURRENT): Used to adjust the output current.
- Encoder Knob (VOLTAGE): Used to adjust the output voltage.
- POWER Button: Main power switch for the unit.
- 5V/2A USB Interface: For charging USB devices.
- OUTPUT ON/OFF Button: Controls the output power to the terminals.
- Output Negative (-): Black terminal for negative output.
- GND: Green terminal for ground connection.
- Output Positive (+): Red terminal for positive output.
3.2 Rear Panel Features
- Smart Cooling Fan: Activates when the internal temperature exceeds 50°C (122°F) to ensure efficient heat dissipation and prolong device lifespan.
- Fuse Box: Provides voltage overload protection.
3.3 Dimensions and Weight
- Dimensions: 218mm (8.6 inches) x 85mm (3.3 inches) x 150mm (5.9 inches)
- Weight: Approximately 1.3 kg (2.8 lbs)
4. Specifications
| Attribute | Value |
|---|---|
| Brand Name | KUAIQU |
| Model Number | KUAIQU19-SPPS-B305D (and other variants) |
| Output Power | 201 - 300W (varies by model) |
| Output Current | 0-10A (varies by model) |
| Output Voltage | Up to 120V (varies by model) |
| Output Frequency | 50/60Hz |
| Output Type | SINGLE |
| Input Voltage | 115V±10% 60Hz / 220V±10% 50Hz |
| Working Temperature | 0 ℃ - 40℃ |
| Relative Humidity (Working) | ＜80%RH |
| Storage Temperature | -10 ℃ - 70℃ |
| Relative Humidity (Storage) | ＜70%RH |
| Voltage Stability (Constant Voltage State) | ≤0.1%+3mV (Low Voltage: 0.2~0.3%+3mV) |
| Load Stability (Constant Voltage State) | ≤0.5%+3mV |
| Ripple Noise (Constant Voltage State) | ≤30mVrms |
| Current Stability (Constant Current State) | ≤0.2%+3mA |
| Load Stability (Constant Current State) | ≤0.2%+3mV |
| Ripple Noise (Constant Current State) | ≤20mArms |
| Display Accuracy | 0.5%+2digits |
| Display Resolution (Voltage) | 000.1V |
| Display Resolution (Current) | 0.001A |
| Fuse Standard | 5A (AC 110V Input) |
| Certification | CE, FCC |
5. Setup
Before using your KUAIQU DC Power Supply, follow these setup steps:
- Unpacking: Carefully remove the power supply and all accessories from the packaging. Verify that all components listed in the package contents are present (power supply unit, output power cord, input power cord).
- Placement: Place the power supply on a stable, level surface with adequate ventilation. Ensure there is enough space around the unit for the cooling fan to operate effectively. The shock-absorbing rubber feet on the bottom provide stability.
- Power Connection: Connect the provided input power cord to the AC input socket on the rear panel of the power supply and then to a suitable AC power outlet. Ensure the voltage matches the power supply's input voltage (115V or 220V).
- Initial Power On: Press the POWER button on the front panel to turn on the unit. The 4-digit LED display should illuminate.
6. Operating Instructions
This section details how to operate your KUAIQU DC Power Supply.
6.1 Adjusting Voltage and Current
- Turn off Output: Before connecting any load, ensure the OUTPUT (ON/OFF) button is in the 'OFF' state (light off).
- Adjust Voltage: Use the VOLTAGE encoder knob to set the desired output voltage. The 4-digit display provides precise readings. The knob allows for both coarse and fine adjustments.
- Adjust Current: Use the CURRENT encoder knob to set the desired output current limit. This acts as a current limiter to protect your circuit.
- Connect Load: Connect your device or circuit to the output terminals (red for positive, black for negative, green for ground) using the provided output lines.
- Enable Output: Press the OUTPUT (ON/OFF) button to enable the power output. The status light will turn on, and the display will show the actual voltage, current, and power being delivered.
6.2 Using the Output ON/OFF Button
The OUTPUT (ON/OFF) button allows you to set voltage and current parameters without immediately applying power to your load. This prevents accidental damage.
- Set the desired current and voltage using their respective encoder knobs while the output is OFF.
- Once parameters are set, press the OUTPUT (ON/OFF) button. The output will be enabled, and the status light will turn on.
- To disable the output, press the OUTPUT (ON/OFF) button again. The status light will turn off.
6.3 Constant Voltage (C.V.) and Constant Current (C.C.) Modes
The power supply automatically switches between Constant Voltage (C.V.) and Constant Current (C.C.) modes depending on the load. The corresponding indicator (C.V. or C.C.) on the display will light up to show the current operating mode.
- C.V. Mode: The output voltage remains constant at the set value, and the output current varies according to the load.
- C.C. Mode: The output current remains constant at the set limit, and the output voltage varies according to the load. This typically occurs when the load resistance is too low for the set voltage, causing the current to reach its limit.
6.4 Using the 5V/2A USB Port
The integrated 5V/2A USB port can be used to quickly charge mobile phones or other USB-powered devices. Simply connect your device's USB cable to this port.
6.5 Product Demonstration Video
Video 6.1: A brief demonstration of the KUAIQU DC Power Supply's features and operation, including knob adjustments and USB charging.
7. Maintenance
Proper maintenance ensures the longevity and reliable performance of your power supply.
- Cleaning: Keep the unit clean and free from dust. Use a soft, dry cloth for cleaning. Do not use liquid cleaners or solvents.
- Ventilation: Ensure the ventilation openings on the sides and rear of the unit are not obstructed. The smart cooling fan will activate automatically when needed.
- Fuse Replacement: In case of a power surge or internal fault, the fuse may blow. The fuse box is located on the rear panel. Replace with a fuse of the same rating (5A for AC 110V input). Always disconnect the power cord before attempting fuse replacement.
- Storage: When not in use for extended periods, store the power supply in a cool, dry place with relative humidity below 70%RH.
8. Troubleshooting
This section provides solutions to common issues you might encounter.
- No Power:
- Check if the power cord is securely connected to both the unit and the AC outlet.
- Ensure the POWER button on the front panel is pressed.
- Check the fuse on the rear panel and replace if blown (refer to Maintenance section).
- No Output Voltage/Current:
- Ensure the OUTPUT (ON/OFF) button is pressed and its indicator light is on.
- Verify that the voltage and current knobs are adjusted to desired non-zero values.
- Check the load connections for any shorts or open circuits.
- Overheating:
- Ensure the cooling fan vents on the sides and rear are not blocked.
- Reduce the load or operating time if the unit consistently overheats. The smart cooling fan should activate to manage temperature.
- Unstable Output:
- Check for loose connections in the output lines.
- Ensure the load is within the power supply's specifications.
If you encounter issues not covered here or require further assistance, please contact KUAIQU customer service.
9. Warranty & Support
KUAIQU provides a 12-month warranty for this product, covering manufacturing defects and malfunctions under normal use. Additionally, lifetime technical support is offered to assist you with any questions or operational guidance.
For warranty claims or technical support, please contact KUAIQU customer service with your purchase details.
10. User Tips
While no specific user reviews or Q&A were provided for this manual, here are some general tips to enhance your experience with the KUAIQU DC Power Supply:
- Pre-set Safely: Always use the OUTPUT (ON/OFF) button to set your desired voltage and current limits before connecting or enabling power to your circuit. This prevents accidental over-voltage or over-current to sensitive components.
- Monitor Displays: Pay attention to the C.V. and C.C. indicators. If the C.C. indicator lights up unexpectedly, it means your circuit is drawing the maximum set current, and the voltage may be lower than intended. Adjust your load or current limit accordingly.
- USB Convenience: Don't forget the built-in 5V/2A USB port. It's handy for charging your phone or powering small USB devices while you work, keeping your workspace tidy.
- Keep it Cool: Ensure the power supply has good airflow. While it has an intelligent cooling fan, keeping it in an open space will help it run more efficiently and quietly.
- Versatile Applications: This power supply is highly versatile. Experiment with it for various tasks like testing LEDs, charging different battery types (e.g., LiFePO4), or powering small electronic projects.
