YIHUA 3005D Variable DC Power Supply

Specifications

I. Applications & Features

Designed specifically for scientific research, product development, lab testing, higher education practical applications, laptop repair, and electronic assembly line. This unit comes with continuously adjustable voltage and current within the rated range, and the output is highly accurate and reliable. The unit comes with a full set of overload protection circuit to protect your circuit board at work, making it an ideal choice for the industry.

II. Control Panel Guide

A diagram shows the control panel with numbered components. The primary display shows "5.0000 30.00" with "CURRENT" and "VOLTAGE" indicators. Key components include:

• 1. Current Display
• 2. Preset Channel Indicator (3 Channels Available)
• 3. Current Setting Indicator
• 4. Function Setting Indicator
• 5. ON/OFF Button (RF Signal Metering)
• 6. Current Protection Mode Selector (Over-current Cut-Off or Constant Current Output)
• 7. Data Storage Button (for the 3 preset channels)
• 8. Current Setting Button
• 9. Data DOWN Button
• 10. Function Lock Button
• 11. Output Terminal (Negative -)
• 12. Terminal (Ground GND)
• 13. Output Terminal (Positive +)
• 14. Power Switch
• 15. Data UP Button
• 16. Output ON/OFF Button
• 17. Voltage Setting Button
• 18. Constant Output Button (19V 5A)
• 19. Constant Output Button (4.2V 2A)
• 20. Buzzer ON/OFF Button
• 21. Voltage Setting Indicator
• 22. Output Indicator
• 23. Voltage Display
• 24. Constant Output Indicator (19V 5A)
• 25. Constant Output Indicator (4.2V 2A)
• 26. Buzzer ON/OFF Indicator
• 27. C.V. Mode Indicator (Constant Voltage)
• 28. C.C. Mode Indicator (Constant Current)
• 29. Over-Voltage Protection Indicator
• 30. Current Protection Mode Indicator

III. Operation

1. Connect the power supply's power cord to an electrical outlet.
2. Turn ON the power switch. The power supply will display the current and voltage setting from the previous use.
3. Basic Operations
   The settings can only be changed when the setting lock is turned OFF (Function Lock Indicator OFF).
   3-1. Press the voltage or current setting button.
   3-2. Press the UP or DOWN button to set the value, then press the voltage/current setting button to confirm.
   3-3. Select the over-current protection mode.
   3-4. Connect the power supply's leads to the load.
   3-5. Press the OUTPUT button to begin operation. [Output ON/OFF Button]
4. Data Storage
   4-1. Press the voltage or current setting button.
   4-2. Press the UP or DOWN button to set the desired value, then press the voltage/current setting button to confirm.
   4-3. Press and hold any one of the 3 preset channel buttons until the respective number on the display blinks. A prolonged beep indicates successful data storage.

5. Constant Output & Preset Channels

Press any of the buttons below to set the power supply in the settings specified in the preset channels or constant output channels.

[4.2V 2A Button] [19V 5A Button] [1] [2] [3]

6. Function Lock

Users can use this function under different operation conditions to ensure a safe, reliable, and consistent work result.

Functions accessible when function lock is turned OFF: [All the buttons]

Functions accessible when function lock is turned ON: [LOCK Button] [1] [2] [3] [CURRENT] [VOLTAGE] [4.2V 2A] [19V 5A]

Functions not accessible when function lock is turned ON: [Output ON/OFF Button]

7. Memory Function (Previous Output Setting)

When the power supply is turned OFF, press and hold the output ON/OFF button, then turn ON the power supply. The display will show "OFF" or "ON". Press the data UP button to turn ON the memory function, and the display will show "ON". Or, press the data DOWN button to turn OFF the memory function, and the display will show "OFF".

8. Over-Voltage Protection

When the output voltage exceeds 36V, the over voltage indicator will blink with "OVP", along with buzzer alarms (if not OFF) to prompt the status. Turn ON the power supply again only once the problem has been diagnosed and solved.

9. Current Protection Modes (Over-current Cut-Off or Constant Current Output)

There are two modes available when outputting power. Press the OCP button, and the OCP indicator turns ON, indicating Over-current Cut-Off Mode. In this mode, the power supply cuts off voltage supply when output current exceeds the set value. If the OCP indicator is OFF, it means Constant Current output mode. In this mode, the power supply outputs constant current as per the set current value.

10. Characteristics of Constant Voltage / Constant Current

This power supply's key function is "automatic C.V. and C.C. switching". It switches between C.V. mode and C.C. mode automatically based on the load change connected to the power supply. The change between modes is referred to as the point of change.

How it works: If the load puts the DC power supply in C.V. (Constant Voltage) Mode, the power supply outputs stabilized voltage (CV indicator ON). As the load increases, the output voltage remains stabilized until it reaches the preset current. At this point, the output current remains stabilized (CC indicator ON). As the load increases, the output voltage decreases proportionally to the load increase. The change from C.C. (Constant Current) mode to C.V. (Constant Voltage mode) occurs as the load decreases.

IV. Maintenance & Precautions

1. When charging the battery, DO NOT connect the positive and negative poles incorrectly.
2. This unit is designed to operate normally without a cooling fan. The specified maximum operation duration under full capacity is at least 4 hours. If a longer duration of use is required, keep the usage rate within 80%. Failure to do so may result in premature failure of the power supply. Set aside additional current capacity when ordering this unit.