YOKOGAWA UP750, User Manual

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<Toc> <3. Programming>
3-27
IM 05E01B02-41E
3. Letting the controller start from the current setpoint and run according to
ramp settings defined for segment 1 of the created program
Starting Point of Operation Controller Behavior
a Begins to run from point C1 (ignores the time setting defined for segment 1).
b Begins to run from point C1 (ignores the time setting defined for segment 1).
c Begins to run from point C1 (ignores the time setting defined for segment 1).
d Begins to run from point D1 according to the preset ramp setting
(the time setting defined for segment 1 is reduced).
e Begins to run from point E1 according to the preset ramp setting.
Segment
1
Segment
2
Segment
3
Segment
4
Segment
5
Program
setpoint
Time
Start of
program operation
A1
B1
C1
D1
E1
e
d
b
a
Setpoint
c
<Controller Settings>
Set the STC (Start Code) program parameter to “1”.
■
PID Switching (Zone PID)
The UP750 offers two methods of PID switching. One of the methods is to automatically
switch between groups of PID constants according to the temperature zone. The other
method is to automatically switch between groups of PID constants on a segment-by-
segment basis. This paragraph explains the method of switching between groups of PID
constants according to the temperature zone. You can set a maximum of seven tempera-
ture zones. When shipped from the factory, the UP750 is configured so that it operates in
zone 1 only and uses only one group of PID constants.
●
When One Group of PID Constants is Used (factory-set default)
As shown in the figure below, the controller uses one group of PID constants over the
range from the minimum value to the maximum value of the PV input range.
1st group of
PID constants
Maximum value of
PV input range (RH1)
Program setpoint
Segment 1
Segment 2
PV input value
Minimum value of
PV input range (RL1)
<Controller Settings>
- Configure the 1st group of PID constants
(1.P, 1.I and 1.D operating parameters).
1st Edition : May 31,2000-00