Fuji Electric Micro-Controller X Socket type - [Ctrl] Control Algorithm (038)

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Parameter functions and setting procedure
CtRL
Control algorithm (038)
[Description] –––––––––––––––––––––––––––––––––––––––––––––––––––––––
This controller has ve temperature control functions. Select the best control method for your application.
Setpoint
Description
oNoF
ON/OFF (2-position) control
Pid
PID control
FUZY
Fuzzy control
SELF
Self tuning control
Pid2
PID2 control
(1) ON/OFF (2-position) control (oNoF)
When you set the control method [CtRL] to “ oNoF,” the device uses ON/OFF control.
In ON/OFF control, the controller switches the control output between ON (100%) and OFF (0%) according to the
SV/PV magnitude relationship. You can set the output hysteresis in the control parameters [HyS] (see page 32).
Reverse Operation (Heating)
PV
ON
OFF
Control
output
t
SV
Set value
PV<SV
HYS
PV>SV
Method used to control the electrical heating furnace. Set
the
[
HYS] to an appropriate value according to the control
target.
Parameter Set value
CtRL oNoF
P-N1 2 or 3
HyS 0 to 50% FS (default: 1°C)
Normal operation (Cooling)
PV>SV
PV<SV
ON
OFF
Control
output
SV
Set value
PV
HYS
t
Method used to control the cooling machine.
Parameter Set value
CtRL oNoF
P-N1 0 or 1
HyS 0 to 50% FS (default: 1°C)
Notes

During ON/OFF control, the P, I and D settings do not affect control.

In the manual operation during ON/OFF control, MV displayed by pressing key is 100%, and MV
displayed by pressing
key is 0%.

If the hysteresis width is narrow, and PV and SV are nearly equal, the output may frequently switch
on and off. Note that it may affect the contact life.
Related parameters:
• Control action [P-N1] (see page 57)
• Hysteresis range for ON/OFF control [HyS] (see page 32)