IDC EIT 10 Tips Tuning PID Loops Rev2

8/12/2019 IDC EIT 10 Tips Tuning PID Loops Rev2

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10 Tips for Tuningof PID Loops

By

Steve Mackay

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IDC Technologies and EIT - Free Webinar

10 Tips for Tuning of PID Loops


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Objectives of Tuning (1)




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Objectives of Tuning (2)

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! " # $ "

Other Aspects of Tuning (3,4,5)




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Loop Controller and Process




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% & "

% # '&

% '$ ( ")

% ) " "

( " "

Steps of Open Loop Tuning

(Reaction Curve)

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Open Loop Tuning Method (2)




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& )

& )

& * )

( )= OP

N L%

( )= =

0 9

3

. %

int

OP N L

T L

( )= =

=

12

2

0 5

. %

.

int

OP N LT L

T Lder

K C

Reaction Curve Calculations

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+ , " " - " "+ * * "+ '$ " " ". /01 +

$ $. " - 2 *+ "

Continuous Cycling - Ziegler & Nichols




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P-only for Continuous Cycling Method

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Reaction Curve Method (Ziegler & Nichols)

# 3 " "

" 4

". " /01 5 " " 6%




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% & " & " .% & " 7(( 8 5 & &96% ) % " &

!% * $ - " ".":% ) " "

Continuous Cycling Method

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& )

& )

& * )

K K C U = 0 5.

K K

T P

C U

U

=

=

0 45

1 2

.

.int

K K

T P

T P

C U

U

der U

=

=

=

0 6

2

8

.

int

Calculation of Tuning Constants




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First Order Lag

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First Order Lag Response Curve




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9 " "." %%%% " %%%

$ " "" $ $; "

Damped Cycling Method

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Damped Oscillation Decay Ratio




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% & " & "% & " 7(( 8 5 & &96% ) % * $ - " %

!% < .:% ) " "

Steps of Damped Cycling Method

7 ") & &

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) & &

7 "

5d6 %%% 0%! "" $




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& )

& * )

( )T

P Rd d int .=

1 2 R

P pd

u=

( )

( )T

P R

T P R

d d

der d d

int =

=

2

8

- $. ; %%%%%

Calculate Tuning Constants

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9 " "."

= 5 6

Tuning for NO Overshoot on Start-up




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" ".", & * "

K K

T P

T P

C U

U

der U

=

=

=

0 2

3

2

.

int

Formula for NO Overshoot on Start-up

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9 " "."

" .

Tuning for SOME Overshoot on Start-up




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" ".", & * "

K K

T P

T P

C U

U

der U

=

=

=

0 33

2

3

.

int

Formula for Some Overshoot on Start-up

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Long Process Deadtimein Closed Loop Control &

The Smith Predictor




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Illustration of a long conveyor system giving anexcessive deadtime to the control loop




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> )

" $

< . $ . #

Choice of Tuning Constant (1)




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, ) "

" .< $

Choice of Tuning Constants (2)

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< ) .

; " .< "# . $ " "

TCPV

SP

T2

Outlet

Inlet

Choice of Tuning Constants (3)




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If you are interested in further training, please visit:

IDC Technologies:Two-day practical courses available to the public:

www.idc-online.com

Conferences:http://www.idc-online.com/conferences-main

The Engineering Institute of Technologies

Online Certificate andAdvanced Diploma programs:

www.eit.edu.au


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