172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
238
barg
(F=1)
1.01970
─
1.45040
1.00000
1.00000
psig
(F=2)
0.70307
0.68948
─
0.68948
0.68948
kPaG
(F=3)
1.01970
1.00000
1.45040
─
1.00000
MPaG
(F=4)
1.01970
1.00000
1.45040
1.00000
─
Table 8-2-2 Correction factor of valve coefficient E
New unit
system
Current
unit system
mmHg
(F=10)
mbar
(F=11)
inHg
(F=12)
psi
(F=13)
kPa
(F=14)
mmHg
(F=10)
─
1.33320
0.39370
1.93370
1.33320
mbar
(F=11)
0.75006
─
0.29530
1.45040
1.00000
inHg
(F=12)
2.54000
3.38600
─
4.91200
3.3600
psi
(F=13)
0.51715
0.68948
0.20360
─
0.68948
kPa
(F=14)
0.75006
1.00000
0.29530
1.45040
─
[Conversion example]
When using the MC-COS-16, whose valve coefficient is currently displayed in
kg/cm
2
G, in a new unit system such as psig:
Current valve coefficient
A: 552 b: 340 C: 369 d: 1425 E: 594 F: 0
The valve coefficient A and C are converted by referring to Table 1-1. The conversion
factor from the current unit system (kg/cm
2
G) to the new unit system (psig) is
0.70307. Therefore, new valve coefficients are;
A = 552 × 0.70307 = 388.09464 ≈ 388 *
C = 369 × 0.70307 = 259.43283 ≈ 259 *
* Rounded to the nearest whole number.
The valve coefficient E is converted by referring to Table 2-1. The conversion factor
from the current unit system (kg/cm
2
G] to the new unit system (psig) is 1.42230.
Therefore, new valve coefficients are;
E = 594 × 1.42230 = 844.8
462 ≈ 845 **
** Rounded to the nearest whole number.
As a result of the above conversion, the values of new valve coefficients A to F are as
follows.
A: 388 b: 340 C: 259 d: 1425 E: 845 F: 2
8.8.1 Controlling by using with MC-COS/MC-VCOS (pressure control)
Steam pressure supplied to the secondary side of the control valve can be controlled
with the pressure control valve for steam MC-COS(R)/MC-VCOS(R) series.
By controlling the steam pressure with TLV proprietary algorithms for pressure
reducing valve for steam, COS (VCOS) series, accuracy and responsiveness
exceeding normal control valves can be achieved.
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)
Product identification
code specified at the
Summary of Contents for SC-F71
Page 17: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 16 ...
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 ...
Page 134: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 133 Setting procedure ...
Page 141: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 140 Setting procedure ...
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Page 280: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 279 Setting procedure ...
Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
Page 303: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 302 Setting procedure ...
Page 316: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 315 Setting procedure ...
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Page 347: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 346 Operating procedure ...
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