I can’t figure out the default PV display for PID
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Why does the PV display -25 or -250 when the PID controller is connected to a 220V power supply without connecting any devices? Is it the lower limit of the current value under default measurement, or temperature and pressure? What is the unit? A newbie seeking help. . .
The PIDs I use are mainly from Anhui Tiankang. . . .
It should be the lower limit value displayed, and the unit should be the same as that set.
4-20Ma corresponds to the upper and lower limits of your range. If you don’t connect the device, it will be 0 Ma, which corresponds to -25% of your measurement range. A display of -25 indicates that the range is 0-100; a display of -250 indicates that the range is 0-1000
Hello, expert! I also want to ask: when setting the PID parameters, I found that there are two or three places where a \"division value\" can be set, including the secondary parameters. Do these parameters conflict with each other? What’s the difference?
It’s a kind of alarm. 0 milliamps corresponds to -25%. I’m telling you that the gauge at this point is not online.
When you connect the controller to a 220V power supply, no device will function – of course, the PV will display -25 or -250. Isn’t this an alarm, meant to remind you that the input signal is incorrect? Didn’t you fail to connect an input signal? As for what the PV displays, you need to enter the controller’s parameter settings interface to check it (the manual may also specify the default PV settings, including the signal type and units).