1.Description: It is a DC 12V under-voltage protection module.This board is a voltage detection module for the common negative electrode (detecting and powering the common negative electrode).The detected voltage needs to have a 2ma drive capability.Its corresponding time is 0.1s-0.2s. 2.Feature: 1>.It has working status indication 2>.It can adjust parameter settings 3>.It has a large detection range 4>.There are multiple setting methods for you to choose 3.Description: 1>.Product Name:DC 12V Under-Voltage Protection Module 2>.Power Supply Voltage:DC12V 3>.Voltage Detection Range:DC 1V~100V 4>.Standby Current:6mA 5>.Working Current:45mA 6>.Resolution:0.4V 7>.Detection Interface Withstand Voltage:150V 8>.Work Temperature:-25℃~85℃ 9>.Work Humidity:5%~95%RH 10>.Size:52*47*28mm 4.Way of Working: 1>.The initial module power-on relay is OFF,and the load does not work. 2>.When it is detected that the voltage is higher than the setting of RA1 (low limit),the relay is ON and the load works. 3>.After the relay is ON,if it detects that the voltage is lower than the RA1 (low limit) setting,the relay is released and the load stops working. 4>.After the relay is released,the relay is ON only when it detects that the voltage is higher than the RA2 (high limit) setting,and the load works. 5>.Repeat steps 3 and 4 to test the voltage repeatedly. 5.Module Debugging Settings: 1>.Test point:TP1 test point,a test point that detects the detection voltage input by the interface (divided by a fixed resistor). 2>.TP3 test point,RA1 (low limit) adjustable resistance adjustable terminal voltage test point. 3>.TP4 test point,RA2 (high limit) adjustable resistance adjustable terminal voltage test point. 4>.Setting method 1:Quick debugging setting (try to use this method as much as possible) 1.1>.The module is normally powered,and the voltage detection interface inputs the low limit voltage.Adjusting RA1 can adjust the voltage at TP3 to be equal to the voltage at TP1 at this time. 1.2>.The module is normally powered,the high voltage of the voltage detection interface is input,and RA2 can be adjusted to make the voltage at TP4 equal to the voltage at TP1 at this time. 1.3>.Power up the module again. 1.4>.Example:Suppose you set the low limit of 12v. 1.5>.The module is normally powered.Use an adjustable power supply to provide a 12v voltage to the detection interface.Use a multimeter to measure the voltage at the TP1 test point.Then adjust the adjustable RA1 so that the voltage at point TP3 is equal to the voltage at point TP1. 1.6>.Suppose you set a high limit of 14v. 1.7>.The module is normally powered.Use an adjustable power supply to provide a 14v voltage to the detection interface.Use a multimeter to measure the voltage at the TP1 test point. 1.8>.Then adjust the adjustable RA2 so that the voltage at TP4 is equal to the voltage at TP1 at this time. 1.9>.Be careful not to set the lower limit voltage higher than the upper limit voltage (TP4 voltage is greater than TP3 voltage). 1.10>.When the multimeter measures,the black pen is connected to GND or the power supply negative pole,and the red pen is connected to the test points TP1,TP3,TP4 to measure the voltage. 5>.Setting method two:Step-down ratio calculation setting 1.1>.The module supplies power normally.Input any voltage "U" within the detection range into the detection interface and measure it with a digital multimeter. 1.2>.At this time,the voltage value at the TP1 point and the "U" voltage value,a fixed step-down ratio VR=U/TP1 is obtained. 1.3>.TP3=Low limit setting voltage/VR 1.4>.TP4=High limit setting voltage/VR 1.5>.Adjust RA1 and RA2 respectively to make the TP3 and TP4 voltages equal to the calculated voltage values,and power on the module again. 1.6>.Also be careful not to set the lower limit voltage higher than the upper limit voltage (TP4 voltage must be greater than TP3 voltage) 1.7>.The test point voltage is for the common ground GND,which is the negative pole of the power supply. 1.8>. When the multimeter measures,the black pen is connected to GND or the power supply negative pole,and the red pen is connected to the test points TP1,TP3,TP4 to measure the voltage. 6>.Setting method three:formula calculation setting 1.1>.Standard board formula calculation setting (with a certain error not exceeding 2%,low internal resistance) 1.2>.TP3=Low limit setpoint/35 1.3>.TP4 voltage=high limit setting/35 1.4>.In addition,be careful not to set the lower limit voltage higher than the upper limit voltage (TP4 must be greater than TP3) 1.5>.The test point voltage is for the common ground GND,which is the negative pole of the power supply. 1.6>.When the multimeter measures,the black pen is connected to GND or the power supply negative pole,and the red pen is connected to the test points TP1,TP3,TP4 to measure the voltage. 6.Package: 1>.1pc DC 12V Under-Voltage Protection Module