172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
221
However, if the proportional band is set too narrow, it will cause hunting and the
manipulated output (MV) will oscillate.
[Adjustment of Integral time (I) and Derivative time (D)]
Made larger (wider, longer)
Made smaller (narrower, shorter)
Overshoot, undershoot and hunting are
suppressed. Setting the value too long may
need longer time till the Set value (SV) is
reached.
Starts up quickly. Setting the value too short
may cause overshoot, undershoot or
hunting.
Parameter setting
Input 1_Proportional band [heat-side] [Parameter Setting Mode: Parameter
group No. 51 (
Pn51
)]
Parameter symbol
Data range
Factory set value
1.
U
1
P
TC/RTD inputs:
0 (0.0, 0.00) to Input 1_Input span (Unit:
C [
F])
(When Control with PV select: 0 to PV select input span)
[Varies with the setting of the Decimal point position.]
Voltage (V)/Current (I) inputs:
0.0 to 1000.0% of Input 1_Input span
(When Control with PV select: 0.0 to 1000.0% of PV select
input span)
0 (0.0, 0.00): ON/OFF action
NOTE: 0 (0.0, 0.00) cannot be set when a setting
“Temperature control operation [MC-(V)COS(R)] is
selected in Input 1_control action.
TC/RTD inputs: 30
V/I inputs: 3.0
To display
“Input 1_Proportional band [heat-side]“, choose a setting other than
“3 to 7 (Pressure control operation [MC-(V)COS(R)])” in Function block No. 51:
Input 1_ Control action (Engineering mode).
Input 2_Proportional band [Parameter Setting Mode: Parameter group No. 52
(
Pn52
)]
Parameter symbol
Data range
Factory set value
2.
U
1
P
TC/RTD inputs:
0 (0.0, 0.00) to Input 2_Input span (Unit:
C [
F])
[Varies with the setting of the Decimal point position.]
Voltage (V)/Current (I) inputs:
0.0 to 1000.0% of Input 2_Input span
0 (0.0, 0.00): ON/OFF action
NOTE: 0 (0.0, 0.00) cannot be set when a setting
“Temperature control operation [MC-(V)COS(R)] is
selected in Input 2_control action.
TC/RTD inputs: 30
V/I inputs: 3.0
To display
“Input 2_Proportional band”, choose “2-loop control/Differential
temperature control” or “Cascade control” in Function block No.58: Select
function for Input 2”, 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
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 ...
Page 114: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 113 Setting procedure ...
Page 131: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 130 Setting procedure ...
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
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Page 347: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 346 Operating procedure ...
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