172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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6.8 Suppressing Sudden Change in Output (Balanceless Bumpless)
Balanceless bumpless may be used to suppress sudden output change when the
control is transferred from Auto mode to Manual mode (or Manual mode to Auto mode).
Description of function
Manipulated output value, when transferred from Auto mode to Manual mode,
depends on the setting of “Manual manipulated output value selection.” Selection of
“Use the most recent manipulated output value” (balanceless bumpless function) or
“Use the Manual manipulated output value*” (bump action) can be selected in
“Manual manipulated output value selection.”
* The Manual manipulated output value is the last manipulated output value in Manual mode
before the mode is transferred from Auto mode to Manual mode.
Note that the Manual manipulated output value can be preset in advance in the Setup
setting mode before the mode is transferred to Manual mode.
When the mode is transferred from Manual mode to Auto mode, the
balanceless bumpless function is always activated.
Balanceless bumpless function
This function is used to prevent overload caused by the Manipulated output value (MV)
suddenly changing when Auto mode is transferred to Manual mode and vice versa.
(a) Transfer from Auto mode to Manual mode.
However, when the mode is transferred to Manual mode, the Manipulated
output value used in Auto mode will be used as the manual output value in
Manual mode.
(b) The manipulated output value is changed (Manual mode function)
(c) Transfer from Manual mode to Auto mode.
When the mode is transferred to Auto mode, the controller starts PID control
based on the MV used in Manual mode.
Bumpless action associated with Auto/Manual transfer at the time of memory area
selection
This instrument allows Auto/Manual transfer at the time of Memory area selection.
Selection of balanceless bumpless action and bump action can be made at the time of
Auto/Manual transfer.
Содержание SC-F71
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