User manual for digital indicator with U/I input SWE-73-A
determine the permissible range of input signal (Figure 7.1).
The permissible range allow user to exceed the
nominal range
of input signal.
If input value is contained in the permissible range a proper result is displayed.
If input signal exceeds this range (defined by
“Lo r”
and
“Hi r”
),
“-Lo-”
or
“-
Hi-”
warning
is displayed
depend on input signal value.
Figure 7.1 E
xample of definition of permissible range of input signal -
“
Lo r
” and “
Hi r
” parameters (
“4-20”
mode)
The
“Lo r”
parameter is important if input is set to
“4-20”
,
“1-5”
or
“2-10”
mode
only, and determines lower border of the permissible range. If input is set to
“0-20”
,
“0-5”
or
“0-10”
mode then lower border of the permissible range is
always 0.
For example if input is set to
“4-20”
mode, then lower border is calculated due to
expression:
I
min
= 4 mA - 4 mA ×
“Lo r”
%.
The
“Lo r”
value can be set from 0 to 99.9%.
Parameter
“Hi r”
determines the upper border of the permissible range accordingly
to the expression (for all modes).
For example if input is set to
“4-20”
mode, then upper border is calculated due to
expression:
I
max
= 20 mA + 20 mA ×
“Hi r”
%.
The value of
“Hi r”
can be set from 0 to 19.9%
In example no 1 of the
DISPLAY VALUES CALCULATION
paragraph the
procedure of the permissible input range determining is presented in details.
If the measurement value do not exceeds
permissible measurement range
but
displayed value exceeds range -999 ÷ 9999, the warning
”-Ov-”
is displayed rather
than the calculated result.
7.3.2.
”bri”
parameter
This parameter allows user to set bright of the LED display, bright can be set to
conventional values from 1 to 8.
19
”
Lo r
” = 75,0% (3 mA)
”
Hi r
” = 5,0 % (1 mA)
4
21
permissible measurement range
measurement result is displayed
regardless on nominal range exceeding
nominal measurement range (4-20mA)
[mA]
20
22
1
0
I
min
I
max
display
message ”
-Lo-
”
display
message ”
-Hi-
”
i
