172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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8.8.2 Controlling by combining with MC-COS/MC-VCOS (temperature control)
Temperature control can be performed by combining the controller with MC-
COS/MC-COSR or MC-VCOS/MC-VCOSR series steam control valves.
The control algorithm is PID control (reverse action), however by using MC-COS/MC-
COSR or MC-VCOS/MC-VCOSR series, which include steam pressure reducing
valves, the supply pressure of steam as a heat source can be controlled, enabling
temperature control.
In addition, the valves are not easily affected by external disturbances such as
pressure fluctuations of the heat source steam on the primary side of the valve.
Parameter setting
Input 1_Control action [Engineering Mode: Function block No. 51 (
Fn51
)]
Parameter symbol
Data range
Factory set value
1. O S
0: PID control with Autotuning (direct action)
1: PID control with Autotuning (reverse action)
2: Heating/Cooling PID control with Autotuning [Cooling linear type]
3: Pressure control operation [MC-COS(R)-3]
4: Pressure control operation [MC-COS(R)-16, 15 to 50 mm]
5: Pressure control operation [MC-COS(R)-16, 65 to 150 mm]
6: Pressure control operation [MC-COS(R)-21]
7: Pressure control operation [MC-VCOS(R)]
8: Temperature control operation [MC-COS(R)-16]
9: Temperature control operation [MC-VCOS(R)]
For cascade control, only 0 or 1 are selectable.
For PV select, only 0, 1 or 2 are selectable.
Product identification
code specified at the
time of order.
Refer to “4. Parameters that are Initialized/Modified when Setting is Changed” for
the parameters that are initialized when the Input 1_Control action is changed.
Input 1_Valve coefficient A to E [Engineering Mode: Function block No. 53
(
Fn53
)]
Parameter symbol
Data range
Factory set value
1. A
-1999 to 9999
0
1. b
-1999 to 9999
0
1. C
-1999 to 9999
0
1. d
-1999 to 9999
0
1. E
-1999 to 9999
0
Valve coefficient value (A to F) is indicated in the valve coefficient plate
(attached) on the MC-(V)COS(R), which is also indicated on the valve
coefficient tag when the equipment is new.
To display “Input 1_Valve coefficient A to E”, choose “3 to 7 (Pressure control
operation [MC-
(V)COS(R)])” or “8 and 9 (Temperature control operation [MC-
(V)COS(R)])” in Function block No.51: Input 1_Control action (Engineering mode).
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 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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