Van ’t Hoffstraat 12
2665 JL Bleiswijk, The Netherlands
T. 31 (0) 10 522 43 73
E-mail: [email protected]
Website: www.tamson.com
Tamson Instruments bv
Page 15/20
tc16-40-58-man.docx Rev. 2.4 UK 9-21
ISO 9001 : 2015
NL/PRO 238239125
VAT: NL 80 66 34 984 B01
Bank account no.:
NL28 INGB 0007 350 370
NL95 RABO 0160100046
Chamber of commerce 27 16 95 41
8.2
Tune PID values
Choose desired set point,
Wait until the bath has reached the set point temperature,
Highest temperature accuracy can be achieved when
tuning the bath. Select tU.n by pressing twice.
Press to choose “ON”,
Press 5 times to return to displayed PV
(PID values can no longer be adjusted unless the "tU.n"
value is set to off)
8.3
Deselect tuning
•
Pressing twice,
•
Display shows ”tU.n”,
•
Press to choose “Off”,
•
Press 5 times to return to displayed PV.
8.4
Manual tuning
The parameters for the PID control can also be changed
manually. The method described below provides fast
finding of the PID settings and is refereed to as the
method of "Ziegler Nichols"
This procedure is only to be followed when automatic
tuning is not functioning.
This method provides fast manual findings of the PID
values. Start the bath at its required running temperature:
1.
Set the integral time “Ti” and the derivative Time
“Td” to off
2. Check if the Lcb and Hcb are set to auto
3. Ignore the fact that the temperature may not
settle precisely at the set point
4. If the temperature is stable, reduce the
proportional band Pb so that the temperature just
starts to oscillate. If the temperature is already
oscillating, increase the proportional band until it
begins oscillating. Allow enough time between
each adjustment for the loop to stabilize. Make a
note of the proportional band value “B” and the
period of oscillation “T” Set the Pb, Ti and Td
parameter values according to the calculations
given in the table below
Type of control
Proportional band
Integral time "
ti
"
Derivative Time "
td
"
Proportional only
2xB
Off
Off
P + I control
2,2xB
0,8xT
Off
P + I + D control
1,7xB
0,5xT
0,12xT
