1. Introduction
The NANKADF GA/GC series are advanced four-window dual-color digital display switching DC voltage regulators. These power supplies feature a USB fast-charging output with a dedicated display, allowing simultaneous monitoring of voltage and current. Designed for versatility, they are ideal for mobile phone and computer repair, battery charging, educational purposes, and production line testing. The GA/GC series incorporates encoder potentiometers (GA series) or buttons (GC series) for continuous and precise adjustment of output voltage and current from 0 to their nominal values. A pre-display function allows users to set values before activation. Equipped with comprehensive short-circuit protection, excellent stability, and low ripple, these compact, lightweight, and aesthetically pleasing units are built for long-term, full-load operation.
Video: Unboxing, USB fast charging demonstration, and voltage/current adjustment.
2. Product Features
- Micro-switching DC power supply design.
- Compact size, light weight, and high power density.
- Automatic switching between constant voltage (CV) and constant current (CC) modes.
- Integrated USB fast charging interface with output display, supporting various fast charging protocols.
- Continuously adjustable output voltage and current from 0 to the rated value.
- Four-window/two-color digital display for high-precision voltage and current readings.
- Equipped with Over Voltage Protection (OVP), Over Current Protection (OCP), and Over Temperature Protection.
- Temperature-controlled fan cooling for low noise and extended lifespan.
- Compatible with both AC 110V and 220V input voltages.
3. Product Specifications
Figure 3.1: Detailed Product Parameters for GA/GC Series Models
| Attribute | Value |
|---|---|
| Brand Name | NANKADF |
| Output Power | 201 - 300W (varies by model) |
| Output Current | 0-10A (varies by model) |
| Output Frequency | 50/60Hz |
| Output Type | SINGLE |
| Certification | CE |
| Origin | Mainland China |
| Product Dimensions | 190mm (L) x 145mm (W) x 80mm (H) |
| Net Weight | 1.15kg |
| Working Temperature | 0°C-40°C; Humidity: <80%RH |
| Storage Temperature | -10°C~70°C; Humidity: <70%RH |
| Voltage Stability (CV) | ≤0.5%+3mV |
| Load Stability (CV) | ≤0.5%+3mV |
| Ripple Voltage (CV) | ≤0.5% Vp-p |
| Current Stability (CC) | ≤0.5%+3mA |
| Load Stability (CC) | ≤0.5%+3mA |
| Ripple Current (CC) | ≤0.5% Vp-p |
| Protection Mode | Current limit protection/short circuit alarm stop output |
| Display | Two sets of 0.4 inch white light four digit digital tubes display; Two sets of 0.25 inch green light three digit digital display. |
| Accuracy | 0.5%±digits |
| Resolution | Voltage:0.01V/Current:0.001A USB voltage:0.01V current:0.01A |
4. Package Contents
Please check the package contents upon receipt to ensure all items are present and undamaged:
- 1x NANKADF DC Power Supply Unit
- 1x Power Cord (EU, US, UK, AU compatible)
- 1x Output Test Line (alligator clips)
- 1x User Manual
Figure 4.1: Contents of the NANKADF Power Supply Package
5. Setup Instructions
5.1. Input Voltage Selection
Before connecting the power supply to the mains, verify the input voltage switch setting on the rear panel. This switch allows selection between 115V and 230V. Ensure it matches your local power grid voltage to prevent damage to the unit.
Figure 5.1: Rear Panel showing Input Voltage Switch and Fuse Box
5.2. Connecting Output Cables
Connect the provided output test lines to the output terminals on the front panel. The red terminal is for positive (+) output, and the black terminal is for negative (-) output. Ensure a secure connection before applying power to your load.
Figure 5.2: GA Series Front Panel with Labeled Terminals
Figure 5.3: GC Series Front Panel with Labeled Terminals
6. Operating Instructions
6.1. Panel Overview
Familiarize yourself with the front panel controls and displays:
- Voltage Display: Shows the output voltage.
- Current Display: Shows the output current.
- USB Fast Charging Voltage/Current Display: Shows the output from the USB port.
- CV Indicator: Illuminates when the unit is operating in Constant Voltage mode.
- CC Indicator: Illuminates when the unit is operating in Constant Current mode.
- Current/Voltage Regulation Knobs (GA Series): Used to adjust output current and voltage.
- Buttons (GC Series): Used for precise adjustment and function selection.
- Power Switch: Turns the unit on/off.
- Output Terminals: Red for positive (+), Black for negative (-).
6.2. Power On/Off
Press the 'POWER' button on the front panel to turn the unit on or off. The display will illuminate upon power-on.
6.3. Adjusting Voltage and Current (GA Series)
The GA series uses encoder adjustment knobs for precise control:
- Voltage Adjustment: Rotate the 'VOLTAGE' knob to adjust the output voltage. Press the knob to switch between adjusting different digits for fine-tuning.
- Current Adjustment: Rotate the 'CURRENT' knob to adjust the output current. Press the knob to switch between adjusting different digits for fine-tuning.
Figure 6.1: GA Series Encoder Knob Operation
6.4. Adjusting Voltage and Current (GC Series)
The GC series features button-based adjustment for accuracy:
- Digit Selection: Use the left/right arrow buttons to select the digit you wish to adjust.
- Value Adjustment: Use the '+' and '-' buttons to increase or decrease the value of the selected digit.
- Voltage/Current Switching: Press the 'V/A' button to switch between voltage and current adjustment modes.
- Output Switch: Use the 'OUT' button to enable or disable the main output.
- OCP Switch: Use the 'OCP' button to toggle Over Current Protection.
Figure 6.2: GC Series Button Adjustment for Voltage and Current
6.5. USB Fast Charging
The integrated USB fast charging interface allows you to charge compatible devices. Simply connect your device to the USB port. The dedicated display will show the voltage and current being delivered to the connected device.
Figure 6.3: USB Fast Charging Interface with Output Display
7. Maintenance
- Cleaning: Regularly clean the exterior of the power supply with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure ventilation openings are free from dust and debris.
- 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 located on the rear panel (refer to Figure 5.1). Replace with a fuse of the same type and rating if necessary.
8. Troubleshooting
- No Power:
- Check if the power cord is securely connected to both the unit and the mains outlet.
- Verify the input voltage switch on the rear panel is set correctly (115V or 230V) for your region.
- Inspect the fuse on the rear panel. If blown, replace it with a fuse of the identical rating.
- No Output Voltage/Current:
- Ensure the output terminals are correctly connected to your load.
- For GC series, check if the 'OUT' button is activated (output enabled).
- If the CC or CV indicator is flashing or behaving unusually, the unit might be in a protection state (Over Current Protection, Over Voltage Protection). Reduce the load or adjust settings.
- Verify that the voltage and current settings are not set to zero.
- Inaccurate Readings:
- Ensure proper connection of test leads.
- Compare readings with a calibrated multimeter if precision is critical.
- Overheating:
- Ensure adequate ventilation around the unit. Do not block the cooling fan vents on the rear panel.
- The intelligent temperature-controlled fan automatically activates when the internal temperature reaches 50°C to dissipate heat.
9. User Tips
- Pre-setting Values: Utilize the pre-display feature to set your desired voltage and current before connecting a sensitive load or enabling the output. This helps prevent accidental over-voltage or over-current conditions.
- USB Charging Convenience: The integrated USB fast charging port is highly convenient for charging mobile devices or powering small USB-powered circuits directly from the power supply, freeing up other power outlets.
- Fine Adjustment: For precise voltage and current settings, especially with the GA series encoder knobs, press the knob to switch between digits for finer control. For GC series, use the arrow buttons to select the specific digit.
- Safety First: Always double-check your connections and settings before powering on the unit or connecting a load. Pay attention to polarity (red for positive, black for negative).
10. Applications
The NANKADF GA/GC series power supplies are suitable for a wide range of applications, including but not limited to:
- Production line testing
- Repairing mobile phones, computers, and other electronic appliances
- Product aging and electroplating processes
- Battery charging
- Laboratory experiments, scientific research, and educational purposes
- Any other occasion requiring a stable and regulated DC power supply
Figure 10.1: Various Application Scenarios for the NANKADF Power Supply
11. Warranty and Support
NANKADF products are manufactured to high-quality standards. For any technical assistance, warranty claims, or support inquiries, please contact the official NANKADF customer service or your authorized reseller. Please retain your proof of purchase for warranty validation.
