Fuji Electric PXR4 Instruction Manual page 30

2
Setting of
the algorithm
* Read if the control
doesn't work as you
expect.
w Control algorithm (ON/OFF, PID or fuzzy)
Type of
control
ON/OFF Output is either ON (100%) or
control OFF (0%).
(Suitable when frequent output
switching is inconvenient.)
PID control 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
Fuzzy
providing control with less
control
overshoot.
At power on, changing a set value
PID control
or the external disturbance, tuning
with
is made automatically so that the
self-tuning.
PID parameters are re-optimized.
It is useful where modification of PID
parameters is required repeatably
due to frequent change in process
condition.
q Select the type of control output action.
Control
output action
Heating Reverse As PV increases,
As PV decreases,
Cooling Direct
As PV increases,
As PV decreases,
Description
– 30 –
Description
MV decreases.
MV increases.
MV also increases.
MV also decreases.
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 procedure
Set parameter
"P-n1" = 0 or 1.
(Refer to Table 2)
Set parameter
"P-n1" = 2 or 3.
(Refer to Table 2)