Help with PID VI

[GDthomas]

Hi All

I'm waiting for the hardware so I can't test this but I'd like to know if this approach will work. As part of a test procedure I have to control 3 pressure regulators with a 0-5 volt signal. The regulators will have the same set point and gains but I need the PID to control each regulator separately. I have an array for "load" which is the set point and an array "mbar" which is the feedback from the 3 pressure sensors. My question, which hopefully I can word this so it makes sense, is - if wired this way will the PID VI send a different signal to each regulator or will it just send the same signal to all three?

Also does anyone have a suggestion as to what PID gains to start with? PID is something new to me.

[GerdW · Accepted solution]

Hi rtpumps,

the array version of the PID (as you used) will send a different output value to each actuator.

Also does anyone have a suggestion as to what PID gains to start with? PID is something new to me.

Wikipedia explains the most common PID gain rules…

[GDthomas]

Thanks GerdW,

Wikipedia also says for manual tune of PID "Requires experienced personnel" and that ain't me.