NANKADF Adjustable DC Power Supply Instruction Manual

1. Introduction

This manual provides detailed instructions for the safe and efficient operation of your NANKADF Adjustable DC Power Supply. This miniature switching DC power supply offers precise control over output voltage and current, with a high-precision digital display for real-time monitoring. It is designed for various applications requiring a stable and adjustable DC power source.

Key Features:

• Compact size, light weight, and high power density.
• Automatic switching between constant voltage (CV) and constant current (CC) modes.
• High-precision 4-digit LED display for voltage, current, and power.
• Continuously adjustable output voltage and current from 0 to nominal value.
• Built-in protection features: Over Voltage Protection (OVP), Over Current Protection (OCP), and Over Temperature Protection.
• Temperature-controlled cooling fan for quiet operation and extended lifespan.
• Dual voltage input compatibility (AC 110V/220V) with a convenient selection switch.
• Integrated USB fast charging port (18W).
• FCC & CE certified product.

2. Safety Information

WARNING: Failure to follow these safety instructions may result in electric shock, fire, or personal injury.

• Always ensure the power supply is turned off and unplugged from the mains before making any connections or adjustments to prevent electric shock.
• Do not operate the device in wet or damp conditions. Keep it away from liquids.
• Ensure proper ventilation around the unit to prevent overheating. Do not block the cooling fan or vents.
• Use only the provided power cord and test leads.
• Do not open the casing of the power supply. There are no user-serviceable parts inside. Refer servicing to qualified personnel.
• Verify the input voltage selector switch on the rear panel matches your local mains voltage (110V or 220V) before plugging in the unit.

3. Package Contents

Please check the package contents upon receipt. If any items are missing or damaged, contact your seller immediately.

• 1x NANKADF DC Power Supply Unit
• 1x Input Power Cord (EU, US, UK, AU options available)
• 1x Test Line (Output Power Cord)
• 1x Instruction Manual

4. Product Overview

4.1 Front Panel

1. Voltage Display: Shows the current output voltage in Volts (V).
2. Current Display: Shows the current output current in Amperes (A).
3. Power Display: Shows the current output power in Watts (W).
4. Voltage Stabilization Indicator (C.V): Lights up when the power supply is operating in constant voltage mode.
5. Steady Flow Indicator (C.C): Lights up when the power supply is operating in constant current mode.
6. Short Circuit Warning Indicator (OCP): Lights up when Over Current Protection is triggered.
7. Output Indicator (OUT): Lights up when the output is enabled.
8. Output Switch: Button to enable or disable the power output to the terminals.
9. Power Switch: Button to turn the unit ON/OFF.
10. USB Fast Charge Interface: USB port for quick charging compatible devices.
11. Voltage Regulation Knob: Rotary encoder for adjusting the output voltage. Press to select digits for fine adjustment.
12. Current Regulation Knob (Push/Hold OCP ON/OFF): Rotary encoder for adjusting the output current. Press to select digits for fine adjustment. Push and hold to toggle Over Current Protection (OCP) ON/OFF.
13. Positive Polarity Terminal (Red): Connects to the positive lead of your load.
14. Negative Polarity Terminal (Black): Connects to the negative lead of your load.
15. Ground Terminal (Green): For safety grounding.

4.2 Rear Panel

• Cooling Fan: Activates when the internal temperature exceeds 122°F (50°C) to maintain optimal operating temperature.
• Input AC 110V/220V Toggle Switch: Used to select the appropriate input voltage for your region.
• AC Power Input Socket: For connecting the provided input power cord.
• Fuse Box: Contains the protective fuse for the unit.

5. Specifications

6. Setup

1. Unpacking and Inspection: Carefully remove the power supply and all accessories from the packaging. Inspect the unit for any signs of damage during transit. If damage is found, do not use the unit and contact your seller.
2. Ventilation: Place the power supply on a stable, level surface, ensuring adequate space around the unit for proper ventilation. Do not obstruct the cooling fan or air vents.
3. Input Voltage Selection: IMPORTANT: Before connecting the power cord, locate the AC 110V/220V toggle switch on the rear panel (Figure 4.2). Set this switch to match your local mains voltage (e.g., 110V for North America, 220V for Europe). Incorrect selection can damage the unit.
4. Power Connection: Connect the provided input power cord to the AC power input socket on the rear panel and then plug the other end into a grounded AC outlet.
5. Output Connections: Connect the red (+) and black (-) test leads (output power cord) to the corresponding red (+) and black (-) output terminals on the front panel. Ensure the connections are secure. If grounding is required for your application, connect a separate ground wire to the green ground terminal.
6. Load Connection: Connect the other end of the test leads to your device or load, observing correct polarity (red to positive, black to negative).

7. Operating Instructions

1. Power On: Press the 'POWER' button on the front panel to turn on the power supply. The display will illuminate.
2. Setting Voltage: Rotate the 'VOLTAGE' knob to adjust the desired output voltage. For fine adjustment, press the 'VOLTAGE' knob to select the digit you wish to change (from left to right), then rotate the knob to set the value (0-9). Repeat for each digit until the desired voltage is set.

   

3. Setting Current Limit: Rotate the 'CURRENT' knob to set the maximum output current limit. Similar to voltage adjustment, press the 'CURRENT' knob to select the digit, then rotate to set the value. This sets the point at which the power supply will switch to constant current (CC) mode to protect your load.
4. Enabling Output: Once voltage and current limits are set and your load is connected, press the 'Output' button to enable the power output. The 'OUT' indicator will light up.
5. Over Current Protection (OCP): The OCP feature protects your load from excessive current. To activate OCP, push and hold the 'CURRENT' knob until the OCP indicator lights up. If an overcurrent condition or short circuit occurs while OCP is active, the power supply will emit a buzzer alarm and automatically cut off the output current. To reset OCP, resolve the fault, then push and hold the 'CURRENT' knob again to toggle OCP OFF and then ON, or simply turn the unit off and on.

   

6. USB Fast Charging: The dedicated USB port on the front panel provides 18W quick charging for compatible devices. Simply connect your device to this port. This function operates independently of the main DC output.

   

7. Power Off: Press the 'POWER' button to turn off the unit. Always disable output before powering off.

8. Applications

The NANKADF Adjustable DC Power Supply is suitable for a wide range of applications, including but not limited to:

• Production line testing and quality control.
• Maintenance and repair of mobile phones, computers, and other electronic appliances (e.g., Car DVD, car audio systems).
• Product aging tests for electronic components such as resistors, capacitors, relays, DC motors, and LEDs.
• Battery charging (ensure appropriate voltage and current settings for battery type).
• Laboratory experiments, scientific research, and educational purposes in schools and universities.
• General factory and maintenance power supply needs.

9. Troubleshooting

• No Power:
  - Check if the power cord is securely connected to both the power supply and the AC outlet.
  - Verify that the AC 110V/220V toggle switch on the rear panel is set correctly for your region.
  - Check the fuse in the fuse box on the rear panel. If blown, replace it with a fuse of the same type and rating.
• No Output Voltage/Current:
  - Ensure the 'Output' button on the front panel has been pressed and the 'OUT' indicator is lit.
  - Check all output connections to the load for proper contact and polarity.
  - If OCP is active (OCP indicator lit), resolve any short circuit or overcurrent condition and reset OCP.
• OCP (Over Current Protection) Triggered:
  - If the 'OCP' indicator lights up and an alarm sounds, it means the output current has exceeded the set limit or a short circuit has occurred.
  - Immediately disconnect the load.
  - Identify and resolve the cause of the overcurrent or short circuit.
  - To reset OCP, push and hold the 'CURRENT' knob to toggle OCP OFF, then push and hold again to toggle it ON, or cycle the power supply OFF and ON.
• Inaccurate Readings:
  - Ensure all connections are tight and free from corrosion.
  - Verify that your multimeter or other measuring instruments are calibrated and functioning correctly.
• Unit Overheating:
  - Ensure the cooling fan and air vents on the rear and sides of the unit are not obstructed.
  - Provide adequate space around the power supply for proper airflow.
  - If the fan is not spinning when the unit is warm, contact support.

10. Maintenance

• Cleaning: Wipe the exterior of the power supply with a soft, dry cloth. Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the casing and display.
• Ventilation: Regularly check that the cooling fan and all air vents are free from dust and debris. Use compressed air to gently clear any blockages if necessary.
• Storage: When not in use for extended periods, store the power supply in a cool, dry, and dust-free environment.
• Fuse Replacement: If the fuse blows, unplug the unit from the mains. Open the fuse box on the rear panel and replace the blown fuse with a new one of the exact same type and rating. Using an incorrect fuse can lead to damage or fire.

11. User Tips

• Precise Adjustments: For very precise voltage and current settings, utilize the encoder adjustment feature. Press the respective knob (Voltage or Current) to select the specific digit you want to modify, then rotate the knob to fine-tune that digit. This allows for highly accurate output control.
• Pre-setting Output: Always set your desired voltage and current limits *before* connecting your sensitive load and enabling the output. This prevents accidental overvoltage or overcurrent conditions that could damage your device.
• Utilize OCP: The Over Current Protection (OCP) is a critical safety feature. Familiarize yourself with how to activate and reset it. It can save your valuable electronic components from damage during testing or development.
• Check Input Voltage: Double-check the 110V/220V switch on the back of the unit before first use or when moving to a different region. This is a common oversight that can lead to immediate damage.

12. Warranty and Support

NANKADF products are manufactured to high-quality standards. For warranty information, technical assistance, or service inquiries, please refer to the contact details provided with your purchase documentation or visit the official NANKADF website. Please have your product model and serial number ready when contacting support.