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中控卡件压力信号异常是什么原因?

2021-12-08 19:01:45 来源:http://www.promaidmusic.com/ 53

A:压力信号出现满量程情况,与实际不符。断开卡件后面的信号线正极,信号由满量程变仍有8公斤左右压力信号(量程为0-13公斤)。经现场观察,该测点经过安全栅。将信号线短路,不过安全栅后,信号显示正常。
A: The pressure signal is in full scale, 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 the signal display is normal after the safety barrier.
初步判断是安全栅出现问题。原因可能是同一组的信号,安全栅是共地的。当安全栅故障后,另一毫安信号耦合到该信号上来,造成信号的干扰。
It is preliminarily judged that there is a problem with the safety barrier. The reason may be that the signals of the same group and the safety barrier are grounded together. When the safety barrier fails, another Ma signal is coupled to the signal, resulting in signal interference.
热电阻信号不准如何排查?
How to check the inaccurate thermal resistance signal?
A:首先,检查热电阻的组态,确认了组态中的热电阻型号和实际的型号保持一致;其次,确保上下位机组态一致。然后,如果还是怀疑测温有问题的话,可以测量现场热电阻A和B之间的阻值为R1;B和C之间的阻值为R2。
A: Firstly, check the configuration of thermal resistance and confirm that the thermal resistance model in the configuration is consistent with the actual model; Secondly, ensure that the upper and lower computer configurations are consistent. Then, if it is still suspected that there is a problem with temperature measurement, the resistance between on-site thermal resistance a and B can be measured as R1; The resistance between B and C is R2.
根据3线制热电阻的测温原理,可以得到热电阻的实际电阻值为R1-2R2。然后查表找出对应的温度。然后用这个温度和监控上的温度再进行比较。如果出入较大,请更换卡件后再次尝试。
According to the temperature measurement principle of 3-wire thermal resistance, the actual resistance value of thermal resistance can be obtained as r1-2r2. Then check the table to find out the corresponding temperature. Then compare this temperature with the temperature on the monitor. If the access is large, please replace the card and try again.
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