C4-5
IM 34M06H62-02E
2nd Edition : June 2008-00
C4.4 Setting SP Gradient
To prevent drastic changes in the Control Set Point (CSP), or to vary the CSP at a fixed
rate, you can set the SP Up Gradient (SPR.UP) or SP Down Gradient (SPR.DN)
parameters.
- Use the SP Up Gradient (SPR.UP) parameter to specify the rate of change in the
increasing direction.
-
Use the SP Down Gradient (SPR.DN) parameter to specify the rate of change in the
decreasing direction.
- Use the SP Gradient Time Unit (SPR.TM) parameter to specify the unit of time for
the rate of change.
The SP gradient function acts in the following situations:
-
When the Set Point parameter selected by an SP Number Selection is changed.
-
When the Remote Set Point parameter is changed in remote mode.
-
When the SP Number Selection (SPNO) parameter is changed.
In the following situations, the SP gradient function acts so that the process value (PV)
approaches the control set point at the specified gradient. This function is called PV
tracking. It is disabled when burnout is detected. For details, see Section C4.5, "PV
Tracking."
-
When the SP Number Selection (SPNO) parameter is changed.
- When parameter setup is changed from “Manual” to “Run” and “Automatic” or to
“Run” and “Cascade”.
-
When parameter setup is changed from “Stop” to “Run” and “Automatic” or to “Run”
and “Cascade”.
Figure C4.2 Setting SP Gradient
Table C4.4 Parameters Related to SP Gradient
Data Position Number
Symbol Description Unit
Data
Range
Default
Value Attribute Stored
Loop1 Loop2 Loop3 Loop4
102 302 502 702 PV Process
value
Industrial
unit
-5.0% to 105.0% of (PRL to PRH)
—
RO
—
103 303 503 703 CSP Control
set
point
Industrial
unit
PRL to PRH
—
RO
—
166 366 566 766 SPR.UP SP up gradient
Industrial
unit
0 to (PRH-PRL).
Function is disabled if value is 0.
0
RW
167 367 567 767 SPR.DN SP down gradient
0
RW
168 368 568 768 SPR.TM SP gradient time unit
None
0: hour; 1: minute
0
RW
Содержание F3CU04-0S
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Страница 215: ...C8 1 IM 34M06H62 02E 2nd Edition June 2008 00 C8 Alarm Function This chapter describes the alarm function of the module...
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