XY7025S CNC DC Buck Boost Converter User Manual

1. Introduction

The XY7025S is a high-performance CNC DC Buck Boost Converter designed for laboratory and charging applications. It functions as a constant voltage and constant current power regulator, capable of handling up to 25A and 1750W. Key features include MPPT solar charging support, external temperature probe for over-temperature protection, and a user-friendly 1.8-inch full-view high-brightness true color LCD.

2. Important Safety Warnings

• Reverse Connection Protection: This product does NOT have output reverse connection protection. Reversing the positive and negative terminals of the battery or load will damage the device. Always double-check polarity before connecting.
• Battery Charging: Battery charging requires specific professional knowledge. Non-professionals should NOT attempt to charge batteries directly with this device without proper understanding and safety measures to prevent fire and explosion.
• Anti-Backflow Diode: When charging rechargeable batteries, an external anti-backflow diode MUST be connected to the output terminal to prevent current from flowing back into the converter, unless you are a professional and understand the implications of not using one.
• Ventilation: Ensure adequate ventilation during operation to prevent overheating.
• Power Rating: Do not exceed the maximum input voltage, output current, or output power ratings specified in the technical specifications.

3. Product Features

• Wide Input/Output Range: Input voltage 12-85V, Output voltage 0-70V, Output current 0-25A.
• High Power Output: Up to 1750W.
• MPPT Functionality: Supports Maximum Power Point Tracking for efficient solar charging.
• External Temperature Probe: Provides over-temperature protection for connected batteries, automatically stopping charging if temperature limits are exceeded.
• Constant Voltage (CV) & Constant Current (CC) Modes: Precise control over output parameters.
• Data Storage: 10 groups of user-defined settings can be stored and recalled.
• Advanced Display: 1.8-inch Full-View High-Brightness True Color LCD with customizable color schemes and 4-way rotation support.
• Communication: Supports standard Modbus protocol for serial communication, including independent dual serial ports, TTL, and on-board RS485 communication.
• Efficient Cooling: Intelligent Temperature-Controlled Fan with large-area heat sinks.
• Low Ripple Output: Achieved through input common-mode inductors and output 2-stage filtering.
• Robust Design: Employs high-power, high-temperature iron-silicon-aluminum magnetic ring inductors.
• Firmware Upgrade: Supports future firmware updates.

4. Technical Specifications

5. Components Overview

The XY7025S consists of a main circuit board and a display unit. Below are the key components and their functions:

• IN+/IN-: Input terminals for connecting the power source (e.g., solar panel, DC power supply).
• OUT+/OUT-: Output terminals for connecting the load or battery.
• Power Switch (hard switch ON/OFF): Physical switch to turn the entire unit on or off.
• MPPT Hardware Switch: Activates the MPPT function; an indicator light illuminates when active.
• NTC Temperature Probe Interface: Port for connecting the external temperature probe.
• Intelligent Temperature-Controlled Fan: Automatically adjusts speed based on internal temperature to ensure optimal cooling.
• Input Common-Mode Inductors: Reduce input power ripple for a stable output.
• Output 2-Stage Filtering: Further refines the output for cleaner power delivery.

• VSET Button: Short press to set Constant Voltage (CV). Long press to quickly recall data set M1.
• SW Button: Short press to enter quick settings. Long press to enable four-way screen rotation.
• ISET Button: Short press to set Constant Current (CC). Long press to enter or exit the data group settings UI.
• Encoder Button: Short press to shift between parameters. Long press to lock/unlock the buttons.
• Power Button (ON/OFF on display): Short press to turn power output on/off. Long press to shut down the device.

6. Setup and Installation

Follow these steps for safe and proper installation:

1. Connect Input Power: Connect your DC power source (e.g., 12-85V DC supply, solar panel) to the IN+ and IN- terminals. Ensure correct polarity.
2. Connect Output Load/Battery: Connect your load or battery to the OUT+ and OUT- terminals.
3. Anti-Backflow Diode (for Battery Charging): If charging a rechargeable battery, and you are not a professional, connect an appropriate anti-backflow diode in series with the OUT+ terminal to prevent reverse current flow.
4. Connect External Temperature Probe (Optional): For over-temperature protection during battery charging, connect the NTC temperature probe to the dedicated interface and attach the probe to the battery.

WARNING: Ensure all connections are secure and correct before applying power. Incorrect wiring can damage the device and connected equipment.

7. Operating Instructions

7.1 Basic Operation

1. Power On: Flip the hard power switch (ON/OFF) on the main circuit board. The LCD display will light up.
2. Turn Output On/Off: Short press the green ON/OFF button on the display unit to enable or disable the power output.
3. Set Voltage (CV Mode): Short press the 'VSET' button. Use the encoder to adjust the desired output voltage. Short press the encoder to confirm or move to the next digit.
4. Set Current (CC Mode): Short press the 'ISET' button. Use the encoder to adjust the desired output current limit. Short press the encoder to confirm or move to the next digit.
5. Shut Down: Long press the green ON/OFF button on the display unit to shut down the device.

7.2 Advanced Functions

• Lock Function: To prevent accidental changes, long press the encoder button for more than 2 seconds to lock the buttons. Repeat the long press to unlock.
• Quickly Recall Data Sets:
  • To quickly load data set M1, long press the 'VSET' button.
  • To access the data set selection window, long press the 'ISET' button. Rotate the encoder to choose the desired data set (M0-M9). Then, either long press 'ISET', briefly press 'SW', or briefly press the encoder to load the selected data set. The display will show the currently loaded data set.
• Adjust System Parameters:
  • On the main screen, briefly press the 'SW' button to select a status bar parameter.
  • Rotate the encoder to switch between different parameters.
  • Briefly press the 'SW' button again to adjust the parameter or open the parameter setting interface.
  • Use the encoder to set the value.
  • To save and exit, either hold the 'SW' button, hold the encoder button, or wait 6 seconds without any button press. All settings are saved automatically.
• MPPT Indicator: When the MPPT function is active, the 'P' indicator on the display will light up.
• Screen Rotation: Long press the 'SW' button to enable four-way screen rotation.

8. User Tips

• Always start with lower voltage and current settings when connecting a new load or battery to avoid damage.
• Utilize the data storage groups (M0-M9) to save frequently used voltage and current settings for quick recall.
• For critical applications, regularly monitor the external temperature probe readings to ensure safe operating conditions, especially during prolonged charging cycles.
• Familiarize yourself with the lock function to prevent accidental parameter changes during operation.

9. Troubleshooting

• No Power/Display:
  • Check if the hard power switch on the main board is ON.
  • Verify input power connections and ensure the input voltage is within the 12-85V range.
• No Output:
  • Ensure the output is enabled by short pressing the green ON/OFF button on the display.
  • Check output connections to the load/battery.
  • Verify that the set output voltage and current are appropriate for the load.
• Device Damage After Battery Connection:
  • This often indicates reverse polarity connection. Refer to safety warnings regarding output reverse connection protection.
• Charging Stops Unexpectedly (with temperature probe):
  • The external temperature probe may have detected an over-temperature condition. Check the battery temperature and ensure proper cooling.
• Inaccurate Readings:
  • Ensure all connections are tight and free from corrosion.
  • Recalibration may be necessary if persistent inaccuracies are observed (refer to advanced settings or contact support).

10. Maintenance

• Cleaning: Keep the device clean and free from dust. Use a soft, dry cloth for cleaning. Do not use liquid cleaners.
• Environment: Operate and store the device in a dry, well-ventilated area, away from direct sunlight, high temperatures, and corrosive gases.
• Ventilation: Ensure the cooling fan and heat sinks are not obstructed to maintain proper airflow.
• Connections: Periodically check all input and output connections for tightness and signs of wear.

11. Warranty and Support

For any issues, technical support, or warranty claims, please contact the seller or manufacturer directly. Provide your product model (XY7025S) and a detailed description of the problem to facilitate assistance.