TOHO TTM-i4N - Integral Time Setting; Derivative Time Setting

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■ Integral time setting
Character Name Description Initial Value
1
SET3
CNT
Setting Mode Selection
Screen
Control Parameter Mode
Settings about Control
13
I
Integral time setting Setting Range: 0–3600
Setting Unit: Second
0
Sets the reset time.
Reset will not be performed if 0 second is set.
In case of heating and cooling controls, both heating and cooling controls commonly use this setting. (Cannot be set
individually)
Reset Operation is an action performed to make the deviation between setting values, which happens during the proportional
control, closer to zero.
Reset Time is a numerical value that sets the intensity of the reset operation. It shall be set in seconds. The shorter the time,
the more intense the reset operation becomes (because it tries to reset the deviation within the time duration that was set).
■ Derivative time setting
Character Name Description Initial Value
1
SET3
CNT
Setting Mode Selection
Screen
Control Parameter Mode
Settings about Control
14
D
Derivative time setting Setting Range: 0–3600
Setting Unit: Second
0
Sets the derivative time.
Derivative will not be performed if 0 second is set.
In case of heating and cooling controls, both heating and cooling controls use this setting. (Setting cannot be performed
individually)
Derivative operation is an operation performed to quickly normalize the state of control against a sudden disturbance by
providing a large amount of manipulated variable.
It provides an output with the size that is proportional to the time derivative value of the measurement value.
Since proportional operation and reset operation are operations that will correct the result of control, they are not capable
of responding timely to a sudden temperature change (such as a disturbance). Derivative action will be used to cover that
disadvantage.
It is a numerical value that sets the intensity of the derivative action. It shall be set in second. The longer the time, the more
intense the derivative operation becomes (because the interval to get the difference gets wider).