Dynamic regulation band
-100
-75
-50
-25
0
25
50
75
100
44 45 46 47 48 49 50 51 52 53 54 55 56
Output [%]
Frequency
[Hz]
Integral regulator
The main function of the integral regulator is to eliminate offset. The integral action time Ti is defined as the
time the integral regulator uses to replicate the momentary change of the output caused by the proportional
regulator.
In the diagram below, the proportional regulator causes an immediate change of 10 %. The integral action
time is then measured when the output reaches 2 × 10 = 20 %.
Integral action time, Ti
0
1
2
3
4
5
6
0 5 10 15 20 25 30 35
sec
mA
Ti = 10 s Ti = 20 s
As shown in the diagram, the output reaches 20 % twice as fast at a Ti setting of 10 s than with a setting of
20 s.
AGC 100 Designer's Reference Handbook
4189340766 UK
PID controller (AGC 110 only)
DEIF A/S Page 143 of 152
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