KUAIQU 5-digit Adjustable Laboratory Power Supply User Manual

1. Product Overview

The KUAIQU 5-digit Adjustable Laboratory Power Supply is a high-precision DC power supply designed for various applications including laboratory work, electronic repair, battery charging, plating, lamp testing, aging testing, DIY projects, and educational purposes. It features a 2.8-inch TFT color screen, 5-digit display, and advanced protection functions.

Key Features:

• 5-digit high-precision display (0.001V, 0.01mA, 0.001mW resolution)
• Real-time voltage and current curve display
• Over Current Protection (OCP) and Over Voltage Protection (OVP)
• Short circuit alarm function
• Four sets of storage list memory (M1-M4)
• Precision encoder for accurate adjustment
• Output ON/OFF switch
• Dual fast charging ports (USB-A 5V2A, USB-C 5V2A)
• Intelligent cooling fan
• Optional RS232/RS485/USB communication interface for PC control

2. Setup

2.1 Unpacking and Inspection

Carefully unpack the power supply and check for any signs of damage. Verify that all accessories are present according to the packing list.

2.2 Power Connection

1. Ensure the power supply is switched OFF.
2. Connect the provided power cord to the AC input on the rear of the unit and then to a suitable power outlet.
3. For US models, use AC 110V 60Hz. For Poland and Spain models, use AC 220V 50Hz.

2.3 Connecting a Load

Connect your load to the positive (+) (red) and negative (-) (black) output terminals on the front panel. Ensure proper polarity. The GND (green) terminal is for grounding.

2.4 PC Communication (Optional)

If your model includes RS232, RS485, or USB communication interfaces:

1. Connect the DC power supply to your PC using a communication cable (USB communication cables are typically included; RS232 and RS485 cables may need to be purchased separately).
2. Install the necessary driver programs and upper computer software on your PC. Refer to the provided WORD document for detailed installation methods.
3. Open the installed software to begin controlling the power supply.

Software download address: https://drive.google.com/file/d/1SMwRcJSb0na0KTnAJE1z0Vurww15Ym-V/view?usp=drive_link

3. Operating Instructions

3.1 Front Panel Functions

• Voltage Encoder Knob: Adjusts output voltage. Press to toggle digit position.
• Current Encoder Knob: Adjusts output current. Press to toggle digit position.
• POWER Switch: Turns the unit on/off.
• OUTPUT Button: Activates or deactivates the power output. Press to start output after presetting values.
• OCP Button: Over Current Protection. Press and hold to set the current limit.
• OVP Button: Over Voltage Protection. Press and hold to set the voltage limit.
• CURVE Button: Toggles the real-time voltage/current curve display.
• LOCK Button: Locks the front panel to prevent accidental changes.
• Memory Button: Accesses and saves preset voltage/current values.
• USB/Type-C Ports: 5V/2A fast charging outputs.

3.2 Setting Voltage and Current

1. Turn on the power supply using the POWER switch.
2. Rotate the VOLTAGE knob to adjust the desired voltage. Press the knob to select the digit to adjust (coarse/fine adjustment).
3. Rotate the CURRENT knob to adjust the desired current. Press the knob to select the digit to adjust.
4. Once the desired voltage and current are set, press the OUTPUT button to enable the power output to your load.

3.3 Over Voltage Protection (OVP) and Over Current Protection (OCP)

These features provide critical safety for your connected devices.

1. Setting OVP: Press and hold the OVP button to enter the voltage limit setting interface. Adjust the maximum voltage value using the VOLTAGE knob. Press the VOLTAGE knob to confirm and save the setting.
2. Setting OCP: Press and hold the OCP button to enter the current limit setting interface. Adjust the maximum current value using the CURRENT knob. Press the CURRENT knob to confirm and save the setting.
3. If the output voltage/current exceeds the preset OVP/OCP limits, the power supply will automatically stop output and sound a beeping alarm, with OVP/OCP flashing on the display.
4. To resume operation after an OVP/OCP event, adjust the voltage/current or disconnect the load (if a short circuit was detected) and then repress the OVP/OCP button.

3.4 Memory Storage Function

The power supply allows you to store and recall up to four sets of commonly used voltage and current settings.

1. Press the Memory button to enter the memory list interface.
2. Rotate the VOLTAGE knob to select the desired memory group (M1-M4).
3. Press the VOLTAGE knob to enter the setting for that group.
4. Press and rotate the VOLTAGE and CURRENT knobs to adjust the values for the selected memory group.
5. Press the VOLTAGE knob again to finish storing the values.
6. To recall a stored setting, select the desired memory group and press the OUTPUT button.

3.5 Real-time Curve Display

The power supply can display real-time voltage and current curves, helping you visualize changes during operation.

1. Press the CURVE button to enter the curve graph screen.
2. Connect your load and turn on the output switch to observe the real-time output curve graph.
3. The blue curve represents the output voltage, and the orange curve represents the output current.
4. You can adjust the output voltage or current to see how the curves synchronize with the display.

Video 1: Demonstration of Curve Graph Function, Memory Storage, OVP, and Accuracy Test.

3.6 Panel Lock Function

To prevent accidental changes to settings during operation, you can lock the front panel.

1. Press the LOCK button. The lock icon on the display will light up.
2. While locked, no buttons or knobs on the panel can be used to change settings.
3. Press the LOCK button again to unlock the panel.

3.7 Mute Function

The power supply includes a beeper for alarms. You can mute it if needed.

1. Press and hold the LOCK button for approximately 5 seconds to turn the beeper sound on or off.

3.8 USB/Type-C Fast Charging

The unit is equipped with USB-A and USB-C ports for charging external devices.

• Connect your device to the 5V/2A USB-A or USB-C port for fast charging.

3.9 Automatic Current Switching

The display automatically switches between Amperes (A) and milliamperes (mA) for precise readings.

• Current values below 0.1A will automatically switch to a 0.01mA display.

4. Maintenance

• Cleaning: Disconnect the power supply from the mains before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use abrasive cleaners or solvents.
• Ventilation: Ensure the ventilation openings are clear and unobstructed to allow for proper airflow and cooling. The intelligent cooling fan will activate when the internal temperature exceeds 50℃ (122℉).
• Storage: Store the unit in a cool, dry place away from direct sunlight and extreme temperatures.
• Fuse Replacement: If the unit fails to power on, check the fuse. Replace it with a fuse of the same type and rating (5A).

5. Troubleshooting

• No Power: Check the power cord connection and the fuse. Ensure the power switch is ON.
• No Output: Ensure the OUTPUT button is pressed (LED is lit). Check for OVP/OCP alarms on the display. Adjust voltage/current settings if they are outside the safe operating range or protection limits.
• Short Circuit Alarm: If a "Possible short circuit" warning appears, immediately disconnect the load and inspect for any short circuits in your circuit. The power supply will stop output automatically. Resolve the short circuit, then repress the OVP/OCP button to clear the alarm and resume operation.
• Unresponsive Controls: Check if the LOCK button is active (lock icon lit). Press it to unlock the panel.
• Overheating: Ensure the ventilation openings are not blocked. The intelligent cooling fan should activate automatically. If overheating persists, reduce the load or operate in a cooler environment.
• PC Communication Issues: Verify that the correct drivers and software are installed. Check the communication cable connection. Ensure the correct COM port is selected in the software.

6. Specifications

General Specifications:

Constant Voltage (CV) State:

• Voltage stability: ≤0.1%+3mV
• Low Voltage: 0.2~0.3%+3mV
• Load stability: ≤0.5%+3mV
• Ripple noise: ≤30mVrms

Constant Current (CC) State:

• Current stability: ≤0.2%+3mA
• Load stability: ≤0.2%+3mV
• Ripple noise: ≤20mArms

Model Specifics (SPPS-K Hyperbolic Microcurrent Series):

7. Warranty and Support

This KUAIQU power supply comes with a Three Year Warranty. For any support inquiries or warranty claims, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.

For software and related materials, please visit: https://drive.google.com/file/d/1SMwRcJSb0na0KTnAJE1z0Vurww15Ym-V/view?usp=drive_link

8. User Tips

• Pre-setting Values: Utilize the precision encoder knobs to set desired voltage and current values *before* enabling the output. This prevents sudden voltage/current spikes to your load.
• Output Switch Convenience: Use the dedicated OUTPUT switch to quickly enable or disable power to your load without needing to disconnect cables or power down the unit. This is especially useful when switching between different test setups.
• Memory Presets: For frequently used voltage/current combinations, save them to the M1-M4 memory slots for quick recall and efficiency.
• Monitoring with Curves: The real-time curve display is excellent for observing transient behavior or subtle changes in voltage and current, particularly useful for analyzing electronic product startup sequences or power consumption.
• Microcurrent Measurement: The 0.01mA resolution is ideal for testing the standby power consumption of electronic products, allowing for precise monitoring of low-power states.