25
!
NOTE:
Before the
AR654.txt
file is modified manually in a text editor, a backup copy must be made of the file (to use later
in the event of problems with improper configuration and the need to restore the default settings).
12.4.2. SETS OF PID PARAMETERS
The controller has 8 independent sets of PID parameters that can be freely assigned to both setpoint values for
individual outputs and to sections of program control using the
PID selection for the SP
parameters (directly to
SP1
and
SP2
for the outputs, chapter 12.4.1, and to
SP
for program sections, chapter 12.4.3). A description of the
principles of operation of PID control and automatic selection of parameters (autotuning), and tips concerning
manual correction can be found in the subchapters below (12.4.2.1÷12.4.2.3).
Table 12.4.2. Configuration parameters in the
Control and alarms options
menu for the selected PID set (1
÷
8)
Parameter
Range of variability of the parameter and description
Default
settings
Assigned and active
outputs
the numbers (
1
÷
4
or
None
) are displayed of the control outputs to which the
presented PID set is assigned (related by the parameters
PID selection for the
SP...
, a description is given in chapters 12.4.1 and 12.4.3), when
None
, the set is
not used or the outputs are disabled (parameter
Control type
=
Off
)
None
Proportional band Pb
0.1
÷
1800.0 °C
or
1
÷
18000
units
(1)
,
the related subjects are described in chapters 12.4.2.1÷12.4.2.3
1.0 °C
Integration time
constant Ti
0
÷
3600
sec.
PID algorithm doubling time,
0
switches off the integrating
component of the PID algorithm
0 sec.
Differentiation time
constant Td
0
÷
999
sec.
PID algorithm lead time,
0
switches off the differentiating
component of the PID algorithm
0 sec.
Pulsing period Tc for the
P/SSR output
3
÷
360
sek
applies only to bistate outputs (P/SSR), in the case of
analogue outputs (mA/V), the parameter is insignificant
5 sec.
Notes:
(1)
– applies to analogue inputs ( mA, V, mV, Ω )
