1. AC power cannot be input, let alone 220V mains power. 2. The maximum allowed input voltage is 75V, and no overvoltage input or reverse polarity connection is allowed. 3． The output cannot be completely guaranteed to prevent backflow. When connecting the battery, ensure that the output voltage of the power module is always higher than the battery voltage, or connect a diode in series with the positive terminal of the output to conduct one-way conduction to prevent the battery voltage from backflow and burning the power supply. 4. When connecting the output terminal to the battery, be careful not to reverse the positive and negative poles. 5. The product is a step-down module, the maximum output voltage = input voltage * 0.95-1V. Product parameters: Product name: CNC DC step-down power supply; Product model: ZK-6522C (color screen model); Input voltage: 6.0-75.00V; Output voltage: 0.0-65.00V; Output current:0-22A; Output voltage accuracy: ±0.3% + 3 words (can be calibrated); Output power: 0-1430W; Output current accuracy: ±0.5% + 3 words (can be calibrated) Voltage resolution: 0.01V; Current resolution: 0.01A; Data group storage: 11 groups; Silicone buttons: 5; Screen size: 1.8-inch upgraded large screen, 36 x 29mm viewing range Buzzer: Yes Cooling fan opening conditions: temperature more than the 45℃ or current more than the 2A or power more than the 30W Product shell: product size 83x48x29.4mm (height does not include rotary encoder) Product motherboard: 124x71x42mm protection mechanism: Input undervoltage protection (LUP): 5.5-64V adjustable, factory default value 5.5V Output overvoltage protection (OUP): 1-66V adjustable, factory default value 66V Output overcurrent protection (OCP): 0.01-23A adjustable, factory default value 23A Output over-power protection (OPP): 1-1450W adjustable, factory default value 1450W Over-temperature pro