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PRESYS
| Instruments
The adjustable parameter span shown on figure 20 is given below.
Mnemonic
Parameter
RATE
Rate
BIAS
Offset
HYST
Hysteresis
GAIN
Gain
RSTN
Manual reset
INT
Integrative rate. 0 to 99.99
DER
Derivative time
H.GAIN
Heating gain
H.INT
Heating
integrative rate
C.GAIN
Cooling gain
C.INT
cooling
integrative rate
DER
Derivative time
BANT
Transition
band
3.2.6 - Level 6 - Tune
The DCY-2050 and 2051 controllers can apply PID control algorithms both for
control loop 1 and for control loop 2. The PID parameters: Gain (GAIN), Integrative Rate
(INT) and Derivative Time (DER) are adjustable over a wide span of values in order to
accommodate several processes with varying characteristics. In the event of a specific
control application, these parameters should be adjusted in order to achieve the best
system performance.
For this purpose, the DCY-2050 and 2051 controllers are provided with auto-tune
algorithms which, whenever activated by the user, will automatically compute, both on
start-up (the controlled variable is far from the set-point, as is usually the case when the
instrument is switched on) and on demand (the controlled variable is close t the set-
point, as is usually the case when the system already under operational regime), the
optimum PID values based on process reaction curve during the auto-tune cycle. After
carrying out PID computation via the auto-tune algorithm the controllers start controlling
the process in the automatic mode under those new values.
The auto-tune algorithm is only carried out provided:
i) the control is of the DUAL type.
ii) the control algorithm for loop 1 or loop 2 is selected for PID.
iii) the programmable set-point is not enabled; STATE should be switched off.
Warning:
Whenever the derivative time (DER) is configured as zero, the auto-tune
algorithm will compute the parameters only for a PI control.
Before carrying out the auto-tune, the user should select the proper control action
(reverse or direct) to meet the requirements of this process.
Adjustable span Factory Value
0.01 to 99.99
1
-999 to 9999
0
-999 to 9999
0
0.01 to 99.99
1
0 to 99.99
50.0
0
0 to 99.99
0
0.01 to 99.99
1
0 to 99.99
0
0.01 to 99.99
1
0 to 99.99
0
0 to 99.99
0
0 to 50
0
DCY-2050 and DCY-2051
Units
------------
EU
EU
-------------
%
rep/min
min
-------------
rep/min
--------------
rep/min
min
%
Operation
Page 42
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