PID change of range change P param too?

Hello

I have a very general question on the PID control. (I have the pid toolkit)

I have a process value is measured (PV, it's the temperature), and I have a fixed setpoint. The output of the PID readers regulator current source (Keithley 2400 sourcemeter). When the PV is far (the State) of the target value, production is expected to be high enough to reduce the transitional period. So let's say, we start with the 1Amp range control in the Keithley. Of course, when the PID does not need too high output, I can go down, first at the beach of my 100 and so on. Also, when I change the range of the Keithley, I change the Terminal value of maximum/minimum scope on the vi of PID.

(Of course, the much better resolution of the Keithley to 1mA compared to 1 ampere)

I have PID adjust such a system at 1 ampere range, for example, and I have the P, I, D params. If I move the range of 1 ampere to the 100mAmp range, do I need to change the P parameter?

Thank you!

It depends on.  If you feed the Keithley in absolute real units (milliamps or amperes) value so there is not need to change the PID gains.  If the value of the Keithley is a relative unit - for example a percentage of full scale - then Yes, you need to adjust your P gain such as changes in range full scale.

Tags: NI Software

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