NANKADF DC Power Supply User Manual

1. Introduction

The NANKADF DC Power Supply is a miniature switching DC power supply designed for precision and convenience. It features adjustable output voltage and current, controlled by variable resistors and encoder potentiometers. The unit provides a high-precision 4-digit LED display for voltage, current, and power, allowing users to monitor operational status and parameters intuitively. This power supply is suitable for a wide range of applications including mobile phone and computer maintenance, circuit board testing, battery charging, and DIY experiments.

2. Safety Information

• Ensure the power supply is connected to a properly grounded outlet.
• Do not operate the device in wet or damp conditions.
• Avoid blocking ventilation openings to prevent overheating.
• Always disconnect power before making or changing connections.
• Do not attempt to service the unit yourself. Refer all servicing to qualified personnel.

3. Package Contents

Upon opening your NANKADF DC Power Supply package, please verify that all items listed below are present and in good condition.

• 1 x NANKADF DC Power Supply Unit
• 1 x Power Cord (appropriate for your region: EU, USA, UK, or Australia)
• 1 x Test Lead (U-shaped output cable)
• 1 x Instruction Manual

Image: Contents of the NANKADF DC Power Supply package.

4. Product Overview

4.1 Front Panel

Image: Detailed front panel layout and controls.

• Voltage Display: Shows the output voltage.
• Current Display: Shows the output current.
• USB Voltage/Current Display: Shows the voltage and current for the USB fast charging port.
• C.V (Constant Voltage) Indicator: Lights up when the power supply is operating in constant voltage mode.
• C.C (Constant Current) Indicator: Lights up when the power supply is operating in constant current mode.
• USB Fast Charging Port: Provides 5V/2A output for charging devices.
• Current Adjustment Knob: Used to set the output current.
• Voltage Adjustment Knob: Used to set the output voltage.
• Power Switch: Turns the unit on/off.
• Output Terminals: Red for Positive Polarity (+), Black for Negative Polarity (-).

4.2 Rear Panel

Image: Rear panel layout with input voltage switch and cooling fan.

• Cooling Fan: Automatically activates when the internal temperature reaches 50°C to dissipate heat.
• Input Voltage Switch: Allows selection between 115V and 230V input. Ensure this is set correctly for your region.
• Fuse Box: Contains the protective fuse for the unit.

5. Setup Instructions

5.1 Initial Inspection

Before connecting the power supply, inspect the unit for any visible damage. Ensure all accessories are present as listed in Section 3.

5.2 Setting Input Voltage

Locate the input voltage switch on the rear panel of the power supply. Set the switch to either 115V or 230V according to your local mains voltage. Incorrect setting can damage the unit.

5.3 Connecting Power

Connect the provided power cord to the AC input socket on the rear panel and then to a grounded wall outlet.

5.4 Connecting Output Cables

Connect the test leads (U-shaped output cable) to the output terminals on the front panel. The red lead connects to the positive (+) terminal, and the black lead connects to the negative (-) terminal. Ensure connections are secure before applying power to your load.

6. Operating Instructions

6.1 Power On/Off

Press the Power Switch on the front panel to turn the unit on or off. The LED display will illuminate upon power-on.

6.2 Adjusting Voltage and Current

The NANKADF DC Power Supply uses encoder knobs for precise voltage and current adjustment. These knobs allow for both fine and coarse adjustments.

Image: Encoder knob operation for setting voltage and current.

• To adjust a value: Press the respective Voltage or Current knob to toggle the digit position you wish to change.
• To change the value: Turn the knob clockwise to increase the value or counter-clockwise to decrease it.
• The display will show the pre-set values before output is enabled.

Image: Digital encoder adjustment for precise control.

6.3 USB Fast Charging

The power supply includes USB-A and Type-C fast charging ports, supporting multiple fast charging protocols up to 18W. Simply connect your mobile device to the appropriate USB port. The display will show the real-time voltage and current being delivered to your device.

Image: USB fast charging in action with real-time display.

Image: USB-A and Type-C charging ports with fast charging capabilities.

6.4 Data Storage Memory (M1, M2, M3)

For programmable models, the power supply offers three data storage memory buttons (M1, M2, M3). You can save specific voltage and current parameters to these keys for quick recall, enhancing convenience and saving time during repetitive tasks.

Image: Data storage memory buttons for saving and recalling settings.

6.5 Over-Current Protection (OCP)

The unit features an Over-Current Protection (OCP) function that stops the output in case of a short circuit or overload. This protects both the power supply and the connected device.

Image: USB fast charging function with short-circuit alarm.

7. Maintenance

7.1 Cleaning

Wipe the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.

7.2 Cooling Fan Operation

The power supply is equipped with a temperature-controlled cooling fan. This fan will automatically activate when the internal temperature reaches approximately 50°C to ensure optimal performance and longevity. If the fan is not running, it may be because the unit has not reached the activation temperature. Ensure the rear ventilation openings are clear of obstructions.

7.3 Fuse Replacement

If the unit fails to power on, check the fuse located in the fuse box on the rear panel. Replace with a fuse of the same type and rating if necessary.

8. Troubleshooting

• Unit does not power on:
  • Check if the power cord is securely connected.
  • Verify the input voltage switch on the rear panel is set correctly (115V or 230V) for your region.
  • Check and replace the fuse in the fuse box if blown.
• No output voltage/current:
  • Ensure the output cables are correctly connected to the terminals and the load.
  • Check if the OCP (Over-Current Protection) or other protection features are active.
  • Verify that the voltage and current settings are not at zero.
• Fan is not running:
  • The fan is temperature-controlled and will only activate when the internal temperature reaches approximately 50°C. This is normal operation and not a fault.
  • Ensure the ventilation openings on the rear and sides are not blocked.
• Display shows scratches:
  • There is a protective film on the display to prevent scratches during shipping. You can carefully peel this film off if desired.

9. Specifications

Image: Product dimensions and weight.

10. User Tips

• Protective Film: The display screen comes with a protective film. If you notice what appears to be scratches, it might just be on this film, which can be removed.
• Input Voltage: Always double-check the 115V/230V switch on the back of the unit to match your local power grid before plugging it in.
• Fan Operation: Don't be alarmed if the cooling fan isn't always running. It's designed to activate only when the internal temperature reaches approximately 50°C to maintain quiet operation.
• Battery Charging: This power supply is suitable for battery charging. Ensure you set the correct voltage and current limits for the battery type you are charging to prevent damage.
• Encoder Knobs: For precise adjustments, press the encoder knob to select the digit you want to change, then rotate to set the value. This allows for fine-tuning.

11. Warranty and Support

Your NANKADF DC Power Supply comes with a warranty card included in the package. Please retain this card and your proof of purchase for any warranty claims.

If you encounter any issues with your power supply that are not resolved by the troubleshooting steps, or if the unit does not work as expected upon receipt, please contact the seller or manufacturer's customer support immediately for assistance. They will be able to provide further guidance and support.