172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
203
MC-COS(R)/MC-VCOS(R) Pressure control
Pressure control performed in combination with the TLV control valve for steam, MC-
COS/MC-VCOS series.
By controlling the steam pressure with TLV proprietary algorithms that utilizes the
characteristics of the COS (VCOS) series, accuracy and responsiveness that
exceeds conventional control valves can be achieved.
Refer to 8.8 Using with MC-COS/MC-VCOS for information on MC-COS(R)/
MC-VCOS(R) pressure control operation.
MC-COS(R)/MC-VCOS(R) Temperature control
Temperature control performed in combination with the TLV control valve for steam,
MC-COS/MC-VCOS series.
The control algorithm is PID control (reverse action), however by using this device
with a COS (or VCOS) series steam pressure reducing valve, the steam supply
pressure can be controlled. In addition, it has characteristics that are not easily
affected by external disturbances such as pressure fluctuations at the primary side of
heat source steam.
Refer to 8.8 Using with MC-COS/MC-VCOS for information on MC-COS(R)/
MC-VCOS(R) pressure control operation.
PID control
PID control is a control method of achieving stabilized control result by setting P
(Proportional band), I (Integral time) and D (Derivative time) constants, and is widely
used. However, with this PID control, if P, I and D values are set to
focus on “better
response to control set value change,” “response to external disturbance”
deteriorates.
In contrast, if PID values are set to focus on “better response to external
disturbance,” “response to control set value change” deteriorates. In PID control a
form of “Response to setting” can be selected from among
Fast
,
Medium
and
Slow
with PID constants remaining unchanged so as to be in good “Response to
disturbances.” In addition, the controller is provided with the function which restricts
the amount of undershooting caused by the cooling nonlinear characteristic
possessed by plastic molding machines when the Set value (SV) is lowered in
Heating/Cooling PID control.
Ordinary PID control
P, I and D constants set so as to be in good response to set value change
P, I and D constants set so as to be in good response to disturbance
Response to set value change
Set value
(SV)
Set value
(SV)
Response to disturbance change
Set value
(SV)
Set value
(SV)
Response to set value change
Response to disturbance change
Summary of Contents for SC-F71
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
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