TOHO ELECTRONICS TTM200 - Manual (Page 166)

48-7009-E 6-18
■ Tuning type setting
SEt04
CNt
Setting content Initial value
13 tUN
1 Primary auto-tuning (for primary PID/position proportional)
1
2 Primary self-tuning (for primary PID/position proportional)
3 Secondary auto-tuning (for primary PID/secondary PID)
4 Secondary self-tuning (for primary PID/secondary PID)
5 Primary/secondary auto-tuning (for primary PID/secondary PID)
Set the auto-tuning or self-tuning of the primary/secondary control.
Note
(1) This setting is allowed only when either primary or secondary control is set for the PID control or position proportional control.
(2) AT of the primary control is not allowed when “4” (secondary self-tuning) is set.
(3) Take care that a change of the control type results in the tuning type of “1” (primary auto-tuning) due to interlock when the
control type is set to “3” (primary/secondary PID control) and the tuning type to either one of “3” to “5.”
<Auto-tuning>
In the auto-tuning, the PID constant is calculated using response in the ON/OFF control.
The PID constant calculated does not change unless the auto-tuning is re-executed.
Thus, the auto-tuning is suited for a subject of control where temperature cyclically changes, such as seal packaging machine.
<Self-tuning>
The self-tuning is a tuning method where the PID constant is automatically calculated based on observation of control wave
shapes.
The self-tuning is suited for a control where subjects of control varies, where control or setting value changes, or where
environment such as ambient temperature changes.
Tuning time is not required to set for the self-tuning, unlikely the auto-tuning.
The decimal point of Bank display blinks, when the wave shape is being observed.
■ AT gain setting
SEt04
CNt
Setting content Initial value
14 AtG 0.1 to 10.0 (times) 1.0
The value of the proportional band to be calculated in AT is multiplied by a coefficient.
Note It is usually recommended that the initial value for the AT gain setting parameter is maintained as is.
■ AT sensitivity setting
SEt04
CNt
Setting content Initial value
15 AtC
Thermocouple/resistance temperature detector input
0.0 to 999.9 (
 C)
0 to 999 (

C)
2
Voltage/current input
0 to 9999 (digit)
20
Set the sensitivity of ON/OFF operation during AT.
The ON/OFF operation is executed during AT.
An appropriate PID constant may not be calculated due to tuning results affected by a large fluctuation of the measurement value
during AT.
In such a situation, appropriate tuning results are obtained through adjustment of the AT sensitivity.
In addition, in case of the small AT sensitivity, measurement values may fluctuate due to noises, and the control at normal
temperatures may greatly be affected by external environments.
In such a situation, best-suited control characteristics may not be calculated due to recognition of external environments as subjects of
control.
Note It is usually recommended that the initial value for the AT sensitivity setting parameter is maintained as is.