LDHJBNAC SPS1203-2KD Dual-Channel Variable DC Power Supply User Manual

1. Introduction

This manual provides detailed instructions for the safe and efficient operation of your LDHJBNAC SPS1203-2KD Dual-Channel Variable DC Power Supply. This high-precision benchtop power supply features dual channels, a 4-digit LCD display, and multiple protection functions including over-voltage, over-current, over-power, over-temperature, and short-circuit protection. It is designed for applications such as production line testing, electrical maintenance, product aging, battery charging, laboratory research, and educational purposes.

2. Safety Instructions

To ensure safe operation and prevent damage to the unit or injury to personnel, please observe the following safety precautions:

• Always connect the power supply to a grounded electrical outlet.
• 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 ventilation openings.
• Do not open the casing of the power supply. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
• Verify that the input voltage selector (if present) matches your local AC supply voltage (220V for this model) before connecting to power.
• Avoid short-circuiting the output terminals for extended periods, even with protection features enabled.
• Disconnect power before making any connections or disconnections to the output terminals.

3. Product Overview

The LDHJBNAC SPS1203-2KD is a dual-channel variable DC power supply. Below are the key components and controls.

Front Panel

This image displays the front panel of the power supply. It features two sets of 4-digit LED displays for Voltage (V), Current (A), and Power (W) for each channel (CH1 and CH2). Below the displays are indicators for Constant Voltage (C.V.) and Constant Current (C.C.) modes. Each channel has dedicated knobs for adjusting Current and Voltage. A central section includes a POWER button and mode selection buttons for Independent (INDEP), Series (SER), and Parallel (PAR) operation. On the right, a 5V/2A USB charging port is visible. The bottom of the panel features red and black output terminals for CH1, CH2, and a combined Series/Parallel output.

• 4-Digit LCD Display: Shows real-time Voltage, Current, and Power for each channel.
• C.V. / C.C. Indicators: Light up to indicate Constant Voltage or Constant Current operating mode.
• Current Adjustment Knobs (CH1, CH2): Used to set the output current limit for each channel.
• Voltage Adjustment Knobs (CH1, CH2): Used to set the output voltage for each channel.
• POWER Button: Turns the unit on or off.
• Mode Selection Buttons (INDEP, SER, PAR): Selects between independent, series, or parallel operation of the two channels.
• USB Charging Interface (5V/2A): Provides a regulated 5V, 2A output for charging compatible devices.
• Output Terminals: Red for positive (+), black for negative (-). Separate terminals for CH1, CH2, and a combined output for series/parallel modes.

Side and Rear Panels

This image shows a side view of the power supply, highlighting the ventilation grilles designed for heat dissipation. Proper airflow through these grilles is essential for maintaining optimal operating temperature.

This image provides another perspective of the power supply, likely showing the rear panel where the AC power input socket and cooling fan are typically located. The cooling fan helps regulate internal temperature during operation.

4. Setup

Follow these steps to set up your power supply:

1. Unpack and Inspect: Carefully remove the power supply from its packaging. Inspect the unit for any signs of physical damage.
2. Placement: Place the power supply on a stable, level, and non-conductive surface. Ensure there is adequate space around the unit for proper ventilation, especially around the side and rear grilles.
3. Power Connection:
   • Ensure the power switch on the front panel is in the 'OFF' position.
   • Connect the provided AC power cord to the power input socket on the rear panel of the power supply.
   • Plug the other end of the AC power cord into a grounded electrical outlet. This model requires a 220V AC input.
4. Initial Check: Before connecting any load, turn on the power supply using the POWER button. The display should illuminate, showing default voltage and current settings.

5. Operating Instructions

The LDHJBNAC SPS1203-2KD offers flexible operation modes for various applications.

5.1. Independent Mode (INDEP)

In this mode, each channel operates independently, providing two separate power outputs.

1. Press the 'INDEP' button to select independent mode.
2. Ensure the power supply is OFF before connecting your load.
3. Connect your load to the CH1 output terminals (red for positive, black for negative) and/or CH2 output terminals.
4. Turn on the power supply using the POWER button.
5. Adjust the VOLTAGE knob for CH1 to set the desired output voltage. Use the fine adjustment for precise settings.
6. Adjust the CURRENT knob for CH1 to set the desired current limit. It is recommended to set the current limit before connecting the load or with the load disconnected to prevent overcurrent.
7. Repeat steps 5 and 6 for CH2 if using both channels independently.
8. The display will show the set voltage, current, and calculated power for each channel.

5.2. Series Mode (SER)

In series mode, the output voltages of CH1 and CH2 are added, providing a higher total voltage. The current limit is determined by the lower of the two channel's current settings.

1. Press the 'SER' button to select series mode.
2. Ensure the power supply is OFF.
3. Connect the positive terminal of CH1 to the negative terminal of CH2 using a short, insulated wire.
4. Connect your load to the remaining free negative terminal of CH1 and the positive terminal of CH2.
5. Turn on the power supply.
6. Adjust the VOLTAGE and CURRENT knobs for both channels as needed. The total voltage will be displayed on the CH1 display, and the current limit will be shown on the CH2 display.

5.3. Parallel Mode (PAR)

In parallel mode, the output currents of CH1 and CH2 are added, providing a higher total current. The voltage is determined by the lower of the two channel's voltage settings.

1. Press the 'PAR' button to select parallel mode.
2. Ensure the power supply is OFF.
3. Connect the positive terminals of CH1 and CH2 together using a short, insulated wire.
4. Connect the negative terminals of CH1 and CH2 together using another short, insulated wire.
5. Connect your load across these combined positive and negative terminals (using the dedicated series/parallel output terminals if available, or the combined CH1/CH2 terminals).
6. Turn on the power supply.
7. Adjust the VOLTAGE and CURRENT knobs for both channels as needed. The total current will be displayed on the CH1 display, and the voltage will be shown on the CH2 display.

5.4. USB Output

The 5V/2A USB port on the front panel can be used to charge compatible devices. Simply connect your device to the USB port using an appropriate cable.

6. Maintenance

Proper maintenance ensures the longevity and reliable operation of your power supply.

• Cleaning: Disconnect the power supply from the AC outlet before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use abrasive cleaners, solvents, or liquids that could seep into the unit.
• Ventilation: Regularly check that the ventilation openings on the sides and rear are free from dust and debris. A clogged fan or vents can lead to overheating.
• Storage: When not in use for extended periods, store the power supply in a cool, dry, and dust-free environment.
• Inspection: Periodically inspect the power cord and output cables for any signs of damage. Replace damaged cables immediately.

7. Troubleshooting

If you encounter issues with your power supply, refer to the following troubleshooting guide:

8. Specifications

The following are the technical specifications for the LDHJBNAC SPS1203-2KD Dual-Channel Variable DC Power Supply:

9. Warranty and Support

For warranty information, technical assistance, or service inquiries, please contact the manufacturer, LDHJBNAC, or your authorized point of purchase. Please have your product model number (SPS1203-2KD) and purchase date available when contacting support.