1. Introduction
This manual provides detailed instructions for the safe and efficient operation of the ZK-SK90 Adjustable CNC DC Regulated Power Supply. The ZK-SK90 is a versatile step-up and step-down module designed for applications requiring precise control over voltage and current. It features a full-view enlarged LCD screen, silicone buttons, and a buzzer for user feedback.
Key features include:
- Input Voltage: 6-36V
- Output Voltage: 0.5-36V
- Output Current: 0-5A
- Output Power: 90W
- Storage: 11 sets of data storage space
- Protection: Multiple protection mechanisms including anti-reverse connection, undervoltage, overvoltage, overcurrent, overtemperature, and overpower protection.
- Expandability: External fan port for enhanced cooling.
- Modular Design: Independent architecture of upper and lower boards, allowing for independent use of the power supply board and replaceable display boards.
2. Product Overview
The ZK-SK90 module is equipped with a clear LCD display and intuitive controls for easy operation. The front panel includes several buttons and a rotary encoder for setting parameters.
The internal design features a PCB sinking gold process for enhanced protection, conductivity, and reliability.
3. Specifications
| Parameter | Value |
|---|---|
| Product Name | CNC DC step-up and step-down power supply |
| Product Model | ZK-SK90 |
| Input Voltage | 6-36.00V |
| Output Voltage | 0.5-36.00V |
| Output Current (SK90) | 0-5A |
| Output Voltage Accuracy | ±0.3% +3 words (calibratable) |
| Output Power (SK90) | 90W |
| Output Current Accuracy | ±0.5% +3 words (calibratable) |
| Voltage Resolution | 0.01V |
| Current Resolution | 0.001A |
| Data Group Storage | 11 groups |
| Silicone Buttons | 5 |
| Screen Size | 1.8-inch upgraded large screen, 36x29mm viewing range |
| Buzzer | Yes |
| Soft Start | Yes |
| Conversion Efficiency | About 88% |
| Product Size | 83x48x39.6mm (Height does not include rotary encoder) |
| Net Weight | 112g |
| Package Weight | 132g |
Protection Mechanisms
- Input Anti-Reverse Connection: Yes
- Output Anti-Reverse Connection: Yes
- Input Undervoltage Protection (LUP): 5.5-35V adjustable (factory default 5.5V)
- Output Overvoltage Protection (OUP): 0.5-37V adjustable (factory default 37V)
- Output Overcurrent Protection (OCP): 0.001-5.2A adjustable (factory default 5.2A)
- Output Over-Power Protection (OPP): 0.01-91W adjustable (factory default 91W)
- Over-Temperature Protection (OTP): 30-99℃ adjustable (factory default 90℃)
- Overtime Protection (OHP): 1 minute-99 hours and 59 minutes (factory default is off)
- Over Capacity Protection (OAH): 0.001-9999Ah (factory default is off)
- Over Energy Protection (OPH): 0.001-4000KWh (factory default is off)
4. Setup
Before operating the ZK-SK90, ensure all connections are secure and correct. This device requires an external DC power source for input.
- Input Connection: Connect your DC power source (6-36V) to the input terminals of the ZK-SK90. Observe correct polarity (positive to positive, negative to negative). The module features input anti-reverse connection protection.
- Output Connection: Connect your load to the output terminals. Ensure the load's voltage and current requirements are within the ZK-SK90's output range (0.5-36V, 0-5A, 90W). The module also has output anti-reverse connection protection.
- Power On: Once connections are verified, apply power to the input. The LCD screen should illuminate, displaying current settings.
- External Fan (Optional): If using an external fan for cooling, connect it to the designated fan port.
5. Operating Instructions
5.1 Basic Parameter Settings
To enter the settings menu, press and hold the M/t button for 2 seconds. The first interface displayed is the OUT settings interface.
- Press V-SET to switch between data group names.
- Press I-SET to select the previous parameter.
- Press OK/↓ to select the next parameter.
5.2 Protection Settings within Data Groups
The ZK-SK90 offers various protection settings to safeguard your equipment and the power supply itself. These settings are configured within the data groups using the rotary encoder and buttons.
- OUP Setting (Overvoltage Protection):
Short press the encoder to select a digit and adjust its value by rotating. For example, if OUP is set to 24.00V, the output will turn off if the output voltage exceeds 24.00V, protecting the load. After protection, 'OUP' will display on the bottom row. Press the power button to cancel the protection. - OCP Setting (Overcurrent Protection):
Short press the encoder to select a digit and adjust its value by rotating. For example, if OCP is set to 2.000A, the output will turn off if the output current exceeds 2.000A, protecting the load. After protection, 'OCP' will display on the bottom row. Press the power button to cancel the protection.
- LUP Setting (Input Undervoltage Protection):
Short press the encoder to select a digit and adjust its value by rotating. For example, if LUP is set to 10.00V, the output will turn off if the input voltage drops below 10.00V. After protection, 'LUP' will display. Press the power button to cancel protection, or it will automatically cancel when the input voltage rises above the LUP setting. - OPP Setting (Overpower Protection):
Short press the encoder to select a digit and adjust its value by rotating. For example, if OPP is set to 30.00W, the output will turn off if the output power exceeds 30.00W. After protection, 'OPP' will display. Press the power button to cancel the protection. - OAH Settings (Over Capacity Protection):
To activate this function, press the power button. Short press the encoder to select a digit and adjust its value by rotating. Long press the power button to switch the decimal point position (0.001Ah, 00.00Ah, 000.0Ah, 0000Ah). The maximum setting is 9999Ah. For example, if OAH is set to 1.000Ah, the output will turn off when the cumulative output capacity exceeds 1.000Ah. After protection, 'OAH' will display. Press the power button to cancel the protection.
To turn on/off the over capacity protection function, short press the power button. This function can also be turned off from the settings menu.
6. Maintenance
Proper maintenance ensures the longevity and reliable operation of your ZK-SK90 power supply.
- Cleaning: Regularly clean the device with a soft, dry cloth. Avoid using abrasive cleaners or solvents. Ensure no dust accumulates in ventilation openings.
- Storage: Store the module in a cool, dry environment away from direct sunlight and extreme temperatures.
- Inspection: Periodically check all connections for tightness and signs of wear or damage.
- Firmware: Keep an eye on the manufacturer's website for any firmware updates, though none are explicitly mentioned in the product description.
7. Troubleshooting
If you encounter issues with your ZK-SK90, refer to the following common problems and solutions:
- No Display/No Output:
- Check input power supply. Ensure it is within the 6-36V range and properly connected.
- Verify output connections to the load. - Output Turns Off Unexpectedly:
- Check the display for protection indicators (LUP, OUP, OCP, OPP, OAH, OPH).
- LUP (Input Undervoltage Protection): Input voltage is too low. Increase input voltage or adjust LUP setting.
- OUP (Output Overvoltage Protection): Output voltage exceeded the set limit. Reduce target output voltage or adjust OUP setting.
- OCP (Output Overcurrent Protection): Output current exceeded the set limit. Reduce load or adjust OCP setting.
- OPP (Output Overpower Protection): Output power exceeded the set limit. Reduce load or adjust OPP setting.
- OAH (Over Capacity Protection): Cumulative output capacity exceeded. Reset OAH or adjust its limit.
- OTP (Over-Temperature Protection): The module is overheating. Ensure adequate ventilation, consider adding an external fan, or reduce load.
- OHP (Overtime Protection): The set operation time has elapsed. Reset or disable OHP if continuous operation is desired. - Inaccurate Readings:
- The device supports calibration for voltage and current accuracy. Refer to advanced settings (not detailed in this manual) or contact support for calibration procedures if needed.
8. User Tips
To get the most out of your ZK-SK90 power supply, consider the following tips:
- Start with Low Settings: When connecting a new load, always start with low voltage and current settings and gradually increase them to the desired levels to prevent damage.
- Monitor Temperature: For prolonged high-power operation, monitor the module's temperature. Utilize the external fan port if the module gets warm to the touch.
- Utilize Data Groups: The 11 data storage groups are useful for quickly switching between frequently used voltage/current profiles for different projects or loads.
- Understand Protection Limits: Familiarize yourself with all protection settings (LUP, OUP, OCP, OPP, OAH, OHP, OTP) and set them appropriately for your application to prevent accidental damage.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your original point of purchase or the seller. Keep your purchase receipt as proof of purchase.
