40
If power is off while
operation continues, PID parameters and
parameter are
not changed. When power is off and then on, device starts to complete the
operation.
Self Tune
Self Tune
i
For starting Tune ( Step Response Tuning ) operation
1-
2-
3-
:
Control form must be P,PI,PD or PID.
For heating tune, Process Value must be 5% of full scale lower than process set
value
For cooling tune, process value must be 5% of full scale higher than process set
value.
If Process Set Value is changed while Tune operation continues, tune operation
is canceled.
If heating function and PID control form is selected for the system;
If set value is greater than process value, process output becomes active till to the
value. When process value reaches to this value,
process output reduces to 0% and it calculates the PID coefficients.
Temp[(Set - Temperature) / 2]
% 100
Process
Output
Process
Value
Time
TunE
Start
Value
PID coefficients are determined
and system becomes stable
Start Value + [ ( Set - Start Value) ]
2
Process Set
Value (
)
If cooling function and PID control form is selected for the system;
If set value is less than process value, process output becomes active till to the
value. When process value reaches to this value,
process output is reduced to 0% and it starts to calculate PID coefficients.
Temperature - [( Temperature - Set ) / 2]
Process
Value
Time
% 100
Process
Output
TunE
Start
Value
Process Set
Value (
)
Start Value - [ ( Start Value - Set ) ]
2
PID coefficient are
determined
