–
31
–
(1) Select the type of control output action.
(2) Control algorithm (ON/OFF, PID or fuzzy)
Heating
Reverse
Control
output action
Description
Setting procedure
As PV increases, MV decreases.
As PV decreases, MV increases.
Cooling
Direct
As PV increases,
MV also increases.
As PV decreases,
MV also decreases.
Set parameter “P-n1” = 0 or 1.
(Refer to Table 2)
Set parameter “P-n1” = 2 or 3.
(Refer to Table 2)
Type of control
ON/OFF control
PID control
Fuzzy control
PID control with
self-tuning.
Description
Output is either ON (100%) or
OFF (0%).
(Suitable when frequent
output switching is
inconvenient.)
The output signal changes
within the range at 0 to 100%
according to PID calculation
which determine the
proportional of ON to OFF in
each TC (cycle time).
Fuzzy operation is added to
PID providing
control with less overshoot.
At power on, changing a set
value or the external
disturbance, tuning is made
automatically so that the PID
parameters are re-optimized.
It is useful where modification
of PID parameters is required
repeatably due to frequent
change in process condition.
Setting procedure
Set “P” =0.0.
Refer to “6-1 ON/OFF control”
Select PID at “CTrL”.
Execute auto-tuning so that optimum
P.I.D can be calculated automatically.
(PID parameters can be set
spontaneously).
*Refer to “6-2 Auto-tuning”.
Select FUZy at “CTrL”.
Then execute the auto-tuning so that
FUZZY control starts.
Select SELF at “CTrL”.
Refer to “6-3 Self-tuning”.
Setting of the algorithm
* Read if the control doesn't work as you expect.
2
To Next Page
Loading...
