ACS355 PID controlled pressure boost pump

HELLO

I Need to control pressure boost pump using PID , I have been made all the configuration related to PID control in ACS355 And now i can enter the set point that i need and i have the feedback signal .

for example if the set point is 5 bar and i start the drive and the actual presser is 3 bar the drive will increase the speed until reach 5 bar and start decrease the speed and its work .

but the response of the pump is too slow

My question is : dose the slow response of the drive due to wrong tuning ? so how can i make the best PID tuning i mean parameter (4001 , 4002 ) .

and i have a second problem for example if the set point is 5 bar and the actual presser is 6 bar when i start the drive the speed increase but this is wrong, because the actual presser is greater than the set point in this case the speed should freeze at 0 HZ , Why in my case the speed increased ?

Thank you ..

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akhraszaid Rank: 202

Asked 8 months ago

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Answers

Hi,
You need to adjust your PID according to the process. What settings do you have for gain and Ti?

For pressure usually PI regulator is OK.
In case the PID is too slow, as principle you should increase gain 4001 and/or decrease integration part 4002. Try first with increasing of 4001 and see the reaction. If you identify the process, you can calculate both precise.

When setpoint is less than actual value - check your minimum speed limit 2001 and minimum AI for feedback (may be 1304). Usually there is no sense to run the drive/pump at 0 Hz - there is always a minimum speed, under which the pump doesn't produce anything (but have a possibility to overheat the motor at low speed).

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