Alicat Scientific EPCD Series 운영 매뉴얼 - 페이지 13

{카테고리_이름} Alicat Scientific EPCD Series에 대한 운영 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Alicat Scientific EPCD Series 17 페이지. Pressure vacuum controller

PID Tuning:

Your flow controller uses a closed-loop algorithm to determine how to

actuate its valve(s) in order to achieve the commanded setpoint. We have

tuned these settings for your specific operating conditions, but changes to

your process sometimes require on-site adjustments to maintain optimal

control performance. If you encounter issues with control stability,

oscillation, or speed of response, fine-tuning your closed loop control may

help.

Changing Gain Values

The only way to adjust The P, D, and I gains on an EPC or EPCD device is by

adjusting registers 21, 22, and 23, respectively.

For more information on reading and adjusting 16-Bit registers, as well as

definitions of the functionality of registers on the EPC or EPCD device please

download the Alicat Serial Primer at:

Tuning the PD/PDF control algorithm

The EPC controller's default control algorithm (PD) employs pseudo-

derivative feedback (PDF) control, which uses two editable variables:



The larger the D gain, the slower the controller will correct errors

between the commanded setpoint and the measured process value.

This is equivalent to the P variable in common PDF controllers.



The larger the P gain, the faster the controller will correct for offsets

based on the size of the errors and the amount of time they have

occurred. This is equivalent to the I variable in common PDF

controllers.

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Note: The D and P variables in the PD/PDF control algorithm are more

typically referred to as P and I, respectively, in PDF

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