DCP200 Profile Controller & Recorder -Product Manual
Page 76 Manual Tuning 51-52-25-150, Issue 1 –April 2009
5. Follow the instructions in the diagram below. At each stage, allow sufficient settling time before moving on to the next stage. P.Pb is the Primary Proportional Band, Int.T is the Integral Time Constant.Table 26. Manually Tuning Valve ControlThe con
troller is now tuned.
Fine-tuning may be required
to optimise the controllers
response
Time
Process Variable
T
b
Time
Process Variable
Ta
START
Apply Power to
the load.
Does the
PV
continuously
Oscillate?
Note the time
interval Ta
Set
P.Pb
= 0.8%
Set Int.T = Ta
Are the
Oscillations
decaying to
zero?
Multiply
P.Pb
setting by 1.5
END
Note the period
of the decaying
oscillations (Tb)
Multiply
P.Pb
setting by 1.5
Set Int.T = Tb
2
No
Yes
Yes
No