<5. Functions>
59
IM 01E21A02-03EN
NOTE
The output fluctuation increases if the damping time constant is set to a lower value.
Set the damping time constant to 5 seconds or longer for using the constant for control purpose.
5.1.7 Low-cut Function Setting
A low-cut value can be set for the frequency output, pulse output and totalizer.
If the low-cut function is used, the flow rate below setponts can be stopped from being output.
This function helps reduce erroneous output when the flow rate is “0”.
However, the unit of the low-cut value is the unit set in Subsection 5.1.4. If the unit is changed,
the low-cut value is changed to the converted value in conjunction with the unit.
Set the low-cut value to “0” if the low-cut function is not used.
The setting can be configured with the following parameters.
AI FB output
Menu path
Display
Device setup ► Detailed setup ► Fieldbus info ► AI1FB* ► (see below)
F
OUNDATION
Fieldbus
Device Configuration ► AI1* ► Device Configuration ► Configuration ► Options ► (see
below)
*For AXG, one from Al1 to Al4, and for AXW, one from AI1 to AI3.
Block
Name
Relative
Index
Parameter
Description
Display
F
OUNDATION
Fieldbus
AI1 - AI4
(AXG)
AI1 - AI3
(AXW)
17
LOW_CUT
Low Cutoff
Specifies the output low-cut
value.
As for low-cut settings of the output signal (LOW_CUT), the output is made to 0 if the output
goes below the low-cut setpoint.
To enable the low-cut function, the “Low cutoff” option should be enabled with IO_OPTS.
However, when the status returns from the low-cut state to the normal state, hysteresis is waited.
When the L_TYPE setting of the output mode is direct, the hysteresis width is 1% of XD_SCALE,
and otherwise, the width is 1% of OUT_SCALE.
F0448.ai
0
Output [m
3
/h]
Hysteresis
1 %
Input [m
3
/h]
low-cut value
