GVDA Adjustable DC Power Supply User Manual

1. Introduction

This manual provides detailed instructions for the GVDA Adjustable DC Power Supply. This miniature switching DC power supply allows for precise control and adjustment of output voltage and current. Its high-precision three-window digital display shows voltage, current, and power simultaneously, offering users an intuitive overview of the device's operational status and parameters.

The GVDA DC Power Supply is designed for various applications including production line testing, electrical maintenance, product aging, battery charging, laboratory scientific research, and educational purposes, wherever a regulated DC power supply is required.

2. Safety Information

• Always connect the power supply to a grounded outlet.
• Do not operate the device in wet or damp conditions.
• Ensure proper ventilation to prevent overheating. The internal cooling fan activates when the temperature exceeds 50°C (122°F).
• Do not open the casing; there are no user-serviceable parts inside. Refer servicing to qualified personnel.
• Before connecting or disconnecting loads, ensure the output is turned off.
• Use appropriate fuses as specified in the technical details.

3. Product Features

• High-precision LED digital display for voltage, current, and power.
• Constant Voltage (CV) and Constant Current (CC) modes.
• Simultaneous display of Voltage (V), Amperage (A), and Wattage (W).
• Overload protection for safe operation.
• Continuously adjustable voltage and current outputs.
• Ability to preset voltage and current values.
• Temperature-controlled cooling fan for low noise operation.
• Integrated USB charging socket (5V/2A).

4. Package Contents

Upon opening the package, please verify that all items listed below are present and in good condition:

• 1 x GVDA DC Power Supply Unit
• 1 x Power Cord
• 1 x Output Load Cord (with alligator clips)
• 1 x User Manual (PDF version available at User manual (PDF))
• 1 x Product Box

5. Product Overview and Panel Instructions

Familiarize yourself with the front panel controls and indicators:

1. Output Voltage Display
2. Output Current Display
3. Output Power Display
4. Constant Voltage (CV) Indicator
5. Constant Current (CC) Indicator
6. Voltage Adjust Knob (Press down to select cursor position)
7. Current Adjust Knob (Press down to select cursor position)
8. Power Switch
9. USB Charging Socket (5V/2A)
10. Output Button (ON/OFF)
11. Positive Polarity Output (+) (Red)
12. Grounding (GND) (Green)
13. Negative Polarity Output (-) (Black)
14. Cooling Fan (Rear)
15. Power Socket (Rear)
16. Fuse Box (Rear)

6. Setup and Basic Operation

6.1 Initial Setup

1. Place the power supply on a stable, well-ventilated surface.
2. Ensure the power switch (8) is in the OFF position.
3. Connect the provided power cord to the power socket (15) on the rear panel and then to a suitable AC power outlet.
4. Connect the output load cord to the output terminals: Red to Positive (+), Black to Negative (-), and Green to Ground (GND) if required by your application.

6.2 Adjusting Voltage and Current

To adjust the output voltage and current:

1. Turn on the power switch (8).
2. Adjust the Voltage Adjust Knob (6) to set the desired output voltage. Press the knob to select the digit you wish to adjust for fine-tuning.
3. Adjust the Current Adjust Knob (7) to set the desired output current limit. Press the knob to select the digit you wish to adjust.
4. Once voltage and current are set, press the Output Button (10) to enable the output. The display will show the actual output voltage, current, and power.

Reminder: When adjusting voltage/current, press down on the respective knob to select the cursor position for accurate parameter adjustment.

7. User Tips

7.1 How to Adjust Current Without Load

To accurately set the current limit without a connected load:

1. Adjust the voltage below 5V using the Voltage Adjust Knob (6).
2. Short-circuit the positive and negative output terminals of the output line (connect the red and black alligator clips together).
3. Adjust the Current Adjust Knob (7) to set the desired current limit.
4. Once set, remove the short circuit and connect your load.

7.2 USB Charging Port

The integrated 5V/2A USB charging socket (9) can be used to charge compatible devices. Simply plug your device's USB cable into the port.

8. Maintenance

• Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
• Ensure the ventilation openings are not blocked to maintain efficient cooling.
• Store the power supply in a cool, dry place when not in use.
• If the fuse blows, replace it with a fuse of the correct rating as specified in the technical details (Fuse Box 16).

9. Troubleshooting

• No Power: Check the power cord connection, the power switch (8), and the fuse (16) on the rear panel.
• No Output: Ensure the Output Button (10) is pressed to enable output. Check if the current limit is set too low for the connected load.
• Overload/Short Circuit: If the CC indicator (5) is lit and output voltage drops, the device is in constant current mode or experiencing an overload/short circuit. Reduce the load or increase the current limit.
• Fan Not Running: The cooling fan (14) is temperature-controlled and will only activate when the internal temperature exceeds 50°C (122°F). This is normal operation.

10. Specifications

Model Specifics:

11. Warranty and Support

GVDA products are manufactured to high-quality standards. For any technical assistance or warranty inquiries, please refer to the contact information provided with your purchase documentation or visit the official GVDA website. Please retain your proof of purchase for warranty claims.