172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
303
8.16 Eliminating Offset Inherent to Proportioning Control (Manual Reset)
In order to eliminate the offset occurring in Proportional (P) control, the Manipulated
output value is manually corrected.
Description of function
This is the function used to manually correct the offset when in Proportional (P)
control or PD control. If the Manual reset value varies, the Manipulated output value
also changes.
Offset means the deviation of the actual when the Manipulated output value becomes
stabilized (stable state).
When the Manual reset is set to the plus (+) side
The Manipulated output value under the stable condition increases by the Manual
reset value.
When the Manual reset is set to the minus (-) side
The Manipulated output value * under the stable condition decreases by the
Manual reset value.
Manual reset is available when the Integral time is 0 (0.0, 0.00).
Parameter setting
Input 1_Manual reset [Parameter Setting Mode: Parameter group No. 51 (
Pn51
)]
Parameter symbol
Data range
Factory set value
1.
U
M R
-100.0 to +100.0%
0.0
To display
“Input 1_Manual reset”, choose “Heating/Cooling PID control” in
Function block No.51: Input 1_Control action (Engineering mode). Additionally,
a value 0 must also be entered in the Input 1_Integral time [heat-side] in the
same memory area.
Input 2_Manual reset [Parameter Setting Mode: Parameter group No. 52 (
Pn52
)]
Parameter symbol
Data range
Factory set value
2.
M R
-100.0 to +100.0%
0.0
To display
“Input 2_Manual reset”, choose “2-loop control/Differential
temperature control” or “Cascade control” in Function block No. 58: Select
function for Input 2 (Engineering mode), AND choose a setting other than “3 to 7
(Pressure control operation [MC-
(V)COS(R)])” in Function block No.52: Input
2_Control action (Engineering mode). Additionally, value 0 must also be entered
in the Input 1_Integral time in the same memory area.
Summary of Contents for SC-F71
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Page 18: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 17 Differential temperature control ...
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
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