What is the cause of abnormal pressure signal of central control card?
A: The pressure signal is in full range, which is inconsistent with the actual situation. Disconnect the positive pole of the signal line behind the card, and the signal changes from full scale to about 8kg pressure signal (the range is 0-13kg). Through field observation, the measuring point passes through the safety barrier. Short circuit the signal line, but after the safety barrier, the signal display is normal.
The preliminary judgment is that there is a problem with the safety barrier. The reason may be the same group of signals, the safety barrier is common ground. When the safety barrier fails, another Ma signal is coupled to the signal, causing signal interference.
How to check if the thermal resistance signal is inaccurate?
A: First of all, check the configuration of the thermal resistor to confirm that the model of the thermal resistor in the configuration is consistent with the actual model; secondly, ensure that the configuration of the upper and lower computer is consistent. Then, if it is still suspected that there is something wrong with the temperature measurement, the resistance between a and B can be measured as R1; the resistance between B and C is R2.
According to the temperature measurement principle of 3-wire thermistor, the actual resistance value of thermal resistor is r1-2r2. Then look up the table to find the corresponding temperature. Then compare it with the temperature on the monitor. If the difference is large, please replace the card and try again.
The above is about the analysis and troubleshooting of abnormal pressure signal of the central control card. I hope it can help you. If you have other questions, please consult our website.