Pid Set Selection; G.soak (Guarantee Soak) - Honeywell DCP301 User Manual

Chapter 5. FUNCTIONS

PID set selection

• Eight sets of PID parameters, PID1 to PID8, are used for
control operation. When the PID set No. is set to each seg-
ment by designating the PID set segment, control output is
calculated by each of the PID parameters.
• There are two ways of selecting PID sets: by designating the
PID set segment and PID set auto-switching. The method
can be selected by setting setup data C 1 1.
C 1 1 set to 0: Designation of PID set segment
C 1 1 set to 1: PID set auto-switching
These two methods cannot be set simultaneously.
Note
When setup data C 1 1 is set to 1, PID items in the program
setup are not displayed.
• By designation of PID set segment, the PID set No. is set for
each segment, and control output is calculated by each of the
PID parameters.
• By PID set auto-switching, the SP full-scale is divided into
eight zones according to the settings of C P . 1 1 to C P . 1 7,
and the PID constant to be used according to the SP value is
automatically selected to calculate the control output.

G.Soak (guarantee soak)

G.Soak ON/OFF and G.Soak width can be set for each seg-
ment. The G.Soak time can also be set by the variable param-
eter G S . t item.
The G.Soak function ensures a segment execution time with
PV close to SP. G.Soak functions not only in soak segments
but also in ramp segments.
At the segment start point, PV and SP are compared, and the
absolute value of the resulting deviation continues for the
G.Soak time or longer. When the absolute value is smaller than
the G.Soak width, operation of that segment is started.
The controller is in the G.Soak standby state until this condi-
tion is satisfied, and the linear lamp on the left of the profile
display blinks. The operation state is the same as hold at the
segment start point (time is set to 0). However, note that in the
FAST mode, the controller does not enter the G.Soak standby
state even if G.Soak is set to ON. The G.Soak standby state
can also be canceled by external switch output. The following
cancel conditions can be selected by the setup date C 5 2 to
C 5 4 settings.
(1) G.Soak cancel when external switch input contact is ON or
PV satisfies the G.Soak cancel conditions
(2) G.Soak cancel when external switch input contact is ON
and PV satisfies the G.Soak cancel conditions
5-8
PID set No. 1 2
PID set segment designation
C P. 1 7
C P. 1 6
C P. 1 5
C P. 1 4
C P. 1 3
C P. 1 2
C P. 1 1
PID set automatic switching
SP
G.Soak width
G.Soak width
Segment set time
Segment execution time
G.Soak standby time Time count start
G.Soak at segment start point
3 4
Zone 8
Zone 7
Zone 6
All SP ranges
are divided to
Zone 5
eight zones.
Zone 4
Zone 3
Zone 2
Zone 1
SP
PV
Time