Fuji Electric Model: PXR4 - Setting the Control Algorithm

– 26 –
Setting of
the algorithm
2
* Read if the control
doesn't work as you
expect.
q Select the type of control output action.
w Control algorithm (ON/OFF, PID or fuzzy)
Setting
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”.
Heating
Cooling
Reverse
Direct
Control
output action
As PV increases,
MV decreases.
As PV decreases,
MV increases.
As PV increases,
MV also
increases.
As PV decreases,
MV also
decreases.
Setting procedure
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.
Description