7-22
EB 6493 EN
Start-up and configuration at the device
Proceed as follows for a PID controller
1.
Switch to manual mode (
).
2. In the CNTR menu, set the function
-CO- C.PID
= PI CP.YP
3. In the PAR menu, set the parameters
KP
= 0.1 and
TN
= 9999 s.
4. In the operating level, set the set point
W
to the required value.
Î
Press to select
W
and use the cursor keys ( ,
). to set the value.
5. In the operating level, change the manipulated variable
Y
so that the controlled variable
X
has the same value as the set point
W
(error Xd = 0).
Î
Press to select
Y
and use the cursor keys ( ,
) to set the value.
6.
Switch to automatic mode (
).
7. In the PAR menu, step up the
KP
parameter until the controlled variable shows an har-
monic oscillation pattern.
Every time the
KP
increases, let the controlled system oscillate, e.g. by making small
changes to the set point.
8. Write down the adjusted KP value as the critical proportional-action coefficient K
P,crit
.
9. Time how long it takes for one entire oscillation to find T
crit
.
To achieve a more precise result, time several oscillations and calculate the average time
from the results.
10. Multiply K
P,crit
and T
crit
by the factors listed in the table below. Use the results for
KP,
TN
and
TV
accordingly.
KP
TN
TV
PI controller
0.59 x K
P, crit
0.50 x T
crit
0.12 x T
crit
11. Change the set point slightly and check the transient behavior. If necessary, retune
KP
,
TN
and
TV
until the closed loop shows a satisfactory control behavior.
Summary of Contents for Trovis 6493
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