Sterlco SMC 2-3.5 Portable Chillers - Manual (Page 17)

3200 Series
ACS 3216 Operators Manual 17
CONTROL
LIST ‘CTRL’
Parameter
Name Parameter Description
(Scrolling Display)
Value Default Access
Level
Pid PID
off Heating off
on.of On/Off
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.
MTr Valve position control
As order
code Conf
oFF Cooling disable
pid PID
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
on.of On/Off
As order
code Conf
rev Reverse acting. Output decreases as PV
increases C T R L . A CONTROL ACTION
Selects the direction of the control. i.e reverse
or direct acting.
dir Direct acting. Output increases as PV
decreases
rev Conf
enG In engineering units P B . U N T PROPORTIONAL BAND UNITS
Perc In percent
OFF Autotune off A T U N E AUTO-TUNE ENABLE
On Set to ‘on’ to start auto-tuning
OFF L3
P B PROPORTIONAL BAND 0.1 t 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
Off Setting loop Break Time to OFF disables
the Loop Break Alarm 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.
1 to 9999 minutes
OFF L3
O P . H I OUTPUT HIGH
Adjust to limit the maximum heating power
applied to the process
+100.0% 100.0% L3
O P . L O OUTPUT LOW
Adjust to limit the maximum cooling power
applied to the process or to apply a minimum
heating power
+100.0% 0.0 (heat
only)
-100 (cool)
L3
M T R . T MOTOR TRAVEL TIME
Set this value to the time that it takes for the
motor to travel from its fully closed to its
fully open position.
0.0 to 999.9 seconds
Note: In motorised valve control only the PB and TI
parameters are active. The TD parameter has no effect on
the control. 0.0 L3
D . B A N D CHANNEL 2 DEAD BAND
Period when no output is demanded from
either channel 1 or channel 2
Adjust, for example, to increase the period
when no heating or cooling power is applied
Off or 0.1 to 100.0% of the cooling proportional band OFF L3
H Y S T . H HEATING HYSTERESIS -199.9 to 200.0 display units 1
H Y S T . C COOLING HYSTERESIS -199.9 to 200.0 display units 1
L3 On/off
only