Santerno Sinus Penta - Page 401

PROGRAMMING GUIDE
SINUS PENTA
401/486
Function
Functions 5 and 6 (2-Zone
Mode) automatically disable the Source Selection
function that can be programmed with C179 and C179b.
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 7 (Two PIDs programming) automatically disables the Source
Selection function that can be programmed with C179 and C179b.
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.