How to use Zhongyuan transmission pressure gauge to control ABB frequency converter?

The remote pressure gauge is actually a potentiometer, which is a sliding rheostat in plain English. For example, if AI 1 is the upper limit pressure and AI2 is the lower limit pressure, then the pressure stability range is between AI 1 and AI2. You can think of this "interval" as "0- 1V" voltage, so the upper limit is 1-2V. As soon as the remote pressure pointer comes up (for example, 3.8-4.0 MPa), ABB starts to reduce the frequency when it crosses 1V, and then goes to sleep at 2V. Similarly, the lower limit is negative1v. Between 0- plus 1V, of course, it refers to the "holding pressure" in a certain frequency range. AI 1 and AI2 can be selected according to the control requirements, or AI 1 can be selected as voltage and AI2 as current, which can be set as integral or differential linear response. But there is no need to study so deeply, just remember that the sampling voltage (current) value of the remote transmission pressure is relative. Generally speaking, the remote transmission pressure can range from 0MPA to 12MPA, that is, from 0V to 12V (or 0 to 24A), and each value can be accurate to 0.01V; AI 1 and AI2 are usually set in percentage. For example, 3V is the low point, then the starting point is 3 divided by 25%, for example, 12, and the high point is 4V, then the dormancy point is 4 divided by 12, which is about 33%. The smaller the range is, the more accurate the voltage stabilizing control is. Of course, other parameters must also be matched. I can tell you step by step if you don't understand, but the code from11kloc-0/to 4020 looks a bit bluffing. Don't be afraid, in front of me, they are nothing.