A
I'm doing a bit of work on an Honeywell Micro TDC-3000 system and wondered if anyone could confirm what the specific PID equation used. It is for the interacting form of PID, and it is Equation B where the Derivative term is acting on the PV rather than the error (SP-PV).
I have an idea that it is :
OP = [ K*(60*T1*s+1)/(60*T1*s) ]*error + [(60*T2*s)/(0.1*60*T2*s+1)]*PV
where:
K = proportional gain
T1 = integral time (mins/repeat)
T2 = derivative time (mins)
and that the 0.1*60*T2*s+1 bit in the derivative action is the filter implemented for the derivative action.
However, my reference book seems to indicate a different (and what seems to me incorrect) structure. I am also wondering if the proportional gain should also apply to the derivative part of the above equation as well.
Thanks in advance for any help.
Andy Clegg
[email protected]
Advanced Control Technology Club, Industrial Systems and Control Ltd.,
50 George Street, Glasgow, G1 1QE
Tel: (+44) 0141 553 1111
http://www.isc-ltd.com/actclub.html
Fax: (+44) 0141 553 1232
I have an idea that it is :
OP = [ K*(60*T1*s+1)/(60*T1*s) ]*error + [(60*T2*s)/(0.1*60*T2*s+1)]*PV
where:
K = proportional gain
T1 = integral time (mins/repeat)
T2 = derivative time (mins)
and that the 0.1*60*T2*s+1 bit in the derivative action is the filter implemented for the derivative action.
However, my reference book seems to indicate a different (and what seems to me incorrect) structure. I am also wondering if the proportional gain should also apply to the derivative part of the above equation as well.
Thanks in advance for any help.
Andy Clegg
[email protected]
Advanced Control Technology Club, Industrial Systems and Control Ltd.,
50 George Street, Glasgow, G1 1QE
Tel: (+44) 0141 553 1111
http://www.isc-ltd.com/actclub.html
Fax: (+44) 0141 553 1232