Super Systems 3 Series - Manual (Page 46)

Operations Manual Series 3
46
11.2 Control Parameters
The control loop is configured by the parameters listed in the following table:
CONTROL LIST ‘CTRL’
Parameter
Name Parameter Description
(Scrolling Display) Value Default Access
Level
C T R L . H HEATING TYPE
Selects the channel 1 control algorithm.
Different algorithms may be selected
for channels 1 and 2. In temperature
control applications, Ch1 is usually the
heating channel, Ch2 is the cooling
channel. Pid PID Conf
off Heating off
on.of On/Off
MTr Valve position control (n/a)
C T R L . C COOLING TYPE
Selects the channel 2 Control
algorithm. Different algorithms may be
selected for channels 1 and 2.
This is not available if the instrument is
a valve position controller oFF Cooling disable Conf
pid PID
on.of On/Off
C T R L . A CONTROL ACTION
Selects the direction of the control. i.e
reverse or direct acting. rev Reverse acting. Output decreases as
PV increases rev Conf
dir Direct acting. Output increases as PV
decreases
P B . U N T PROPORTIONAL BAND UNITS enG In engineering units
Perc In percent
A T U N E AUTO-TUNE ENABLE OFF Auto-tune off OFF L3
On Set to ‘on’ to start auto-tuning
FaiL Displayed if Autotune cannot be
completed
A T . R 2 G AUTOTUNE CONFIGURES R2G YES R2G will be set by Auto-tune yes Conf
No Allows a value for R2G to be entered
manually
P B PROPORTIONAL BAND 0.1 to 9999 display units or
1 to 999.9% if proportional band expressed as % 20 L3
T I INTEGRAL TIME
Off to 9999 seconds 360 sec L3
T D DERIVATIVE TIME
Off to 9999 seconds
TD defaults to OFF for valve position control
60 sec L3
R 2 G RELATIVE COOL GAIN
0.1 to 10.0 1.0 L3
C B H i CUTBACK HIGH
Auto or 1to 3000 display units Auto =
3xPb
L3
C B L o CUTBACK LOW
Auto or 1 to 3000 display units Auto =
3XPb
L3
M R MANUAL RESET 0.0 to 100.0% (heat only)
-100.0 to 100.0% (heat/cool) 0.0% L3
L B T LOOP BREAK TIME
The loop break alarm attempts to
detect loss of restoring action in the
control loop by checking the control
output, the process value and its rate of
change.
Loop break detection works for all
control algorithms: PID, VP and ON-
OFF.
Note: This is not to be confused with
load failure and partial load failure. Off Setting loop Break Time to OFF
disables the Loop Break Alarm OFF L3
1 to 9999 minutes
O P . H I OUTPUT HIGH
Adjust to limit the maximum heating
power applied to the process +100.0%
100.0% L3