Reply To: Fractional PID Controller Design

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I was replicating the design of a FOPID controller for the system 1/(14994s^1.31+6009.5s^0.97+1.69) in page 96 of FOMCON manual.

When identified with freq range(10^-4 to 10^4),and order 5, I got some different values other than the written.Then I changed the order to 8 and got nearly similar results for K,L,T.

But when I computeed with Z-N rule totally diff. results came.

Kp=860.428 where as given is 802.915, Kd=4906.64 whereas the given amt is Kd=6.095.

Please explain why it happens.