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Reference Manual
IP2030/RM, Rev AA
Section 4: Getting started
June 2014
Section 4: Getting started
Applying the optional offset adjustment to the selected source
Parameter P112 is a positive, negative, or zero offset for adjustment of the selected HART
variable. As an example, this feature may be used to handle a standing level in a tank.
Note
P112 is in the menu:
SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 I/P Offset (on MCU901/3) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 I/P Offset (on MCU902)
Applying the optional scaling and profiling to the selected source
If volumetric or flow values are in the selected HART variable, set parameter P113 to Scaled.
Use parameter P114 to convert (scale) the value into units that match the display units you may
have selected (P200, P201, P202 or P203, as applicable in SETUP / [CONTROLLER /] DISPLAY).
If level values are in the selected HART variable, parameter P113 can be set to Scaled if wanting
just level measurement, and then use parameter P114 as described above. By selecting profile
calculation using P113, a level value can be used to calculate a volumetric or open channel flow
rate. The programming (configuring) required for this can be found in “Volumetric contents and
flow measurement applications (advanced users)” on page 52.
Note
P113 and P114 are in the sub-menus /Ch1 Profile and /Ch1 Pre scale at:
SETUP / [CONTROLLER /] INPUT CHANNEL (on MCU901/3) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 (on MCU902)
Applying an optional low-cut-off action
The channel 1 output result in D851 can be forced to zero when it falls below a positive
threshold, which is a percentage of the maximum flow. Enter the percentage in P117.
By default, the setting is “None” to switch off this optional check.
This feature is particularly useful in an open channel flow application where a small standing or
remaining liquid level in the channel would cause continued totalizing of flow when no actual
flow exists. As a guide, set P117 to a positive value of 2% of maximum flow to overcome this
problem.
Note
P117 is in this menu:
SETUP / [CONTROLLER /] INPUT CHANNEL / Ch1 Low Cut-off (on MCU901/3) or
SETUP / [CONTROLLER /] PV CALCULATION / CHANNEL 1 / Ch1 Low Cut-off (MCU902)
Applying optional damping to the control unit PV
P210 allows the user to apply damping to smooth out big steps in calculated values in D851.
Note
P210 is in the menu:
SETUP / [CONTROLLER /] OUTPUT / PV DAMPING / MCU PV DAMPING
D851 is in the menu: MONITOR / DIAGNOSTICS / CHANNELS / Ch1 Output