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PROGRAMMING
INSTRUCTIONS
SINUS PENTA
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Functions 5 and 6 (2-Zone Mode) automatically disable the Source Selection
function that can be programmed with
C179
.
In functions 5 and 6 only the references selected with
C285-C286
and the
feedback values selected with
C288
-
C289
are used.
2-Zone MIN
: The PID operates on the system with the larger algebraic error
MAX(
C285
–
C288
,
C286
–
C289
).
This means that the system takes control of the PID having the minimum
feedback in respect to its setpoint.
2-Zone MAX
: The PID operates on the system with the smaller algebraic error
MIN(
C285
–
C288
,
C286
–
C289
).
This means that the system takes control of the PID having the maximum
feedback in respect to its reference.
NOTE:
When
C171a
Input for PID Control Selection
is activated
and the
selected input is activated, the 2-zone (MIN or MAX) mode is disabled and the
PID always operates on the error resulting from
C285
–
C288
.
Function
Function 7 (Two PIDs programming) automatically disables the Source
Selection function that can be programmed with
C179
.
The two PIDs use only the signals selected with
C285/C288
for PID and with
C286/C289
for PID2.
2 PID:
PID and PID2 operate in parallel; the outputs of the two PIDs are
matched based on the configuration of
C171a:
If
C171a
=
0: Disabled
, the outputs of the two PIDs are summed to each other;
If
C171a
is enabled, the output of the PID regulator depends on the logic state
of the configured input: 0
PID, 1
PID2.
C291b PID2 Operating Mode
C291b
Range
1
2
1: Normal
2: Inverse
Default
1
1: Normal
Level
ENGINEERING
Address
1296
Function
This parameter sets how to calculate the PID2 output.
Two modes are available: 1:
Normal
, 2:
Inverse
.
In
Normal
mode,
the output of the PID regulator is the actual PID2 output.
If 2:
Inverse
is selected, the error sign is reversed.
The Inverse operating mode can be used for special applications only (see
Keeping Fluid Level Constant (Example)).
C292 Selection of the Variable for Calculating the Derivative Term
C292
Range
0
1
0: Measure
1: Error
Default
0
0: Measure
Level
ENGINEERING
Address
1292
Function
This parameter sets the variable used for calculating the derivative term.
By default, the derivative term is computed according to the feedback measure,
but it can also be computed according to the PID error:
Error = Reference – Feedback.