1. Introduction
This manual provides essential information for the safe and efficient operation of your NANKADF Adjustable DC Power Supply. Please read it thoroughly before use and keep it for future reference.
The NANKADF DC Power Supply is a miniature switching DC power supply designed for various applications including production line testing, mobile phone and computer repair, product aging, battery charging, and laboratory use. It features encoder adjustment for precise voltage and current control, a high-precision digital display, and multiple protection functions.
2. Package Contents
Please check the package for the following items:
- DC Power Supply Unit
- AC Power Cord (appropriate standard for your region)
- Output Test Cable (alligator clips)
- User Manual
3. Safety Instructions
- Always connect the power supply to a grounded outlet.
- Do not operate in wet or damp conditions.
- Ensure proper ventilation; do not block the cooling fan.
- Do not open the casing; there are no user-serviceable parts inside except for the fuse.
- Verify the input voltage switch setting matches your local power supply before connecting.
- Disconnect power before making or changing connections to the output terminals.
4. Product Overview
The NANKADF DC Power Supply features a compact design with a clear digital display and intuitive controls. Key components include:
Front Panel Controls and Indicators:
- **Voltage Display**: Shows the output voltage.
- **Current Display**: Shows the output current.
- **Power Display**: Shows the output power (W).
- **Voltage Regulation Encoder**: Adjusts the output voltage.
- **Current Regulation Encoder**: Adjusts the output current.
- **USB Fast Charging Interface**: USB-A and USB-C ports for fast charging devices.
- **Output Button (OUT)**: Enables or disables the power output.
- **Power Switch**: Turns the unit on/off.
- **Positive Output (Red)**: Connects to the positive terminal of the load.
- **Negative Output (Black)**: Connects to the negative terminal of the load.
- **Ground Terminal (Green)**: For safety grounding.
- **C.V. Indicator Light**: Constant Voltage mode indicator.
- **C.C. Indicator Light**: Constant Current mode indicator.
- **O.C.P. Indicator Light**: Over Current Protection indicator.
Rear Panel Components:
- **Cooling Fan**: For heat dissipation.
- **AC Input Voltage Switch**: Selects between 115V and 230V input.
- **AC Input Power Socket**: Connects the power cord.
- **Fuse Box**: Contains the protective fuse.
5. Setup Instructions
- **Unpacking**: Carefully remove the power supply and all accessories from the packaging. Inspect for any damage.
- **Input Voltage Selection**: Before connecting the power cord, locate the **AC Input Voltage Switch** on the rear panel. Ensure it is set to match your local mains voltage (115V or 230V).
Figure 4: Input Voltage Switch and Fuse Box - **Power Connection**: Connect the provided AC power cord to the **AC Input Power Socket** on the rear panel, then plug the other end into a grounded wall outlet.
- **Initial Power On**: Flip the **Power Switch** on the front panel to the 'ON' position. The display should light up.
- **Output Connections**: Before connecting any load, ensure the power supply output is disabled (OUT button is off). Connect your load to the **Positive Output (Red)** and **Negative Output (Black)** terminals using the provided test cables or appropriate wiring. For safety, connect the ground terminal if your application requires it.
6. Operating Instructions
6.1 Adjusting Voltage and Current
The power supply uses encoder adjustment for precise control:
- **Select Adjustment Mode**: Press the voltage or current encoder knob to switch between adjusting the coarse (whole number) or fine (decimal) values. Some models may have separate coarse/fine knobs.
- **Adjust Value**: Rotate the selected encoder knob clockwise to increase the value and counter-clockwise to decrease it. The display will show the set value in real-time.
- **Pre-setting**: You can set the desired voltage and current before enabling the output.
6.2 Enabling/Disabling Output
After setting the desired voltage and current, press the **OUT** button to enable the power output to your connected load. Press it again to disable the output.
6.3 USB Fast Charging
The power supply includes USB-A and USB-C fast charging ports with an output display. These ports support various fast charging protocols and provide up to 18W output.
- Connect your device to the USB-A or USB-C port.
- The display will show the USB charging voltage and current in real-time.
6.4 Data Storage (M1, M2, M3)
Some models feature three data storage buttons (M1, M2, M3) to save and recall frequently used voltage and current settings.
- **Save Setting**: Set the desired voltage and current. Long-press one of the M buttons (M1, M2, or M3) until the display indicates the setting is saved.
- **Recall Setting**: Short-press one of the M buttons (M1, M2, or M3) to recall the saved voltage and current settings.
7. Maintenance
7.1 Cleaning
- Ensure the power supply is turned off and unplugged before cleaning.
- Use a soft, dry cloth to wipe the exterior. Do not use abrasive cleaners or solvents.
- Periodically clean the cooling fan vents to prevent dust buildup, which can affect performance.
7.2 Fuse Replacement
If the unit does not power on, the fuse may need replacement. Always replace with a fuse of the same type and rating.
- Turn off the power supply and unplug it from the mains.
- Locate the **Fuse Box** on the rear panel (refer to Figure 4).
- Use a small flat-head screwdriver to gently pry open the fuse box cover.
- Remove the old fuse and insert a new fuse of the correct specification.
- Close the fuse box cover securely.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not power on. | No power from outlet, power cord loose, fuse blown, input voltage switch incorrect. | Check wall outlet, ensure power cord is securely connected, replace fuse (see Maintenance), verify input voltage switch setting. |
| No output voltage/current. | Output disabled, OCP triggered, faulty connection. | Press the OUT button to enable output. Check if OCP indicator is lit; if so, clear the short circuit and reset. Verify all output connections. |
| OCP (Over Current Protection) alarm sounds. | Load drawing too much current, short circuit in the load. | Immediately disconnect the load. Identify and fix the short circuit or reduce the load. Reset the OCP by long-pressing the current adjustment knob (some models) or cycling the power. |
| USB fast charging not working. | Device not compatible with fast charging protocols, faulty USB cable, device already fully charged. | Ensure your device supports the fast charging protocols. Try a different USB cable. Check device battery level. |
| Fan is noisy or not running. | Dust buildup, fan malfunction. | Clean the fan vents. If the fan still malfunctions, contact support. |
9. Specifications
| Feature | Specification |
|---|---|
| Input Power Supply | AC 230V/115V ±10%; 50Hz/60Hz |
| Output Power | 301 - 400W (varies by model) |
| Output Voltage Range | 0 to rated voltage (e.g., 30V, 60V) continuously adjustable |
| Output Current Range | 0 to rated current (e.g., 5A, 10A) continuously adjustable |
| Voltage Stability (CV) | 0.5% ±3mV |
| Load Stability (CV) | 0.5% ±3mV |
| Ripple Voltage | ≤0.5% Vp-p |
| Current Stability (CC) | 0.5% ±3mA |
| Load Stability (CC) | 0.5% ±3mA |
| Ripple Current | ≤0.5% Vp-p |
| Recovery Time | ≤500μS |
| Temperature Coefficient | ≤100ppm/°C |
| Display Type | 0.4-inch white light four-digit tube (Voltage, Current, Power); 0.25-inch green light three-digit tube (USB Voltage, USB Current) |
| Display Accuracy | 0.5% ±5 words |
| Display Resolution | Voltage 0.01V, Current 0.001A (USB: Voltage 0.01V, Current 0.01A) |
| USB Fast Charging Output | USB-A & USB-C, up to 18W, supports various fast charging protocols |
| Protection Modes | Over-Voltage Protection (OVP), Over-Current Protection (OCP), Over-Temperature Protection |
| Operating Temperature | 0℃～40℃; Relative humidity: <80%RH |
| Storage Temperature | -10℃～70℃; Relative humidity: <70%RH |
| Product Dimensions (L x W x H) | 190mm x 80mm x 145mm (approx. 7.5in x 3.15in x 5.7in) |
| Net Weight | 1.15Kg (approx. 2.54lb) |
10. User Tips
- **Pre-set before connecting**: Always set your desired voltage and current before connecting your load and enabling the output. This prevents accidental over-voltage or over-current to sensitive components.
- **Use the OUT button**: Get into the habit of using the 'OUT' button to enable/disable output rather than connecting/disconnecting wires while the unit is live.
- **Monitor the display**: Pay attention to the C.V. and C.C. indicators to understand if the power supply is operating in constant voltage or constant current mode.
- **Check input voltage**: Double-check the 115V/230V switch on the back before first use, especially if traveling or moving the unit.
11. Warranty and Support
This product typically comes with a 365-day warranty from the date of purchase. Please refer to your purchase documentation for specific warranty terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact the seller or manufacturer directly through the platform where you purchased the product. Keep your purchase receipt and product serial number handy.
