User manual - METER SRP-94-XC
“
4-20
”
- current output enabled with 4 ÷ 20 mA mode,
”
modb
”
- current output controlled via RS-485 interface.
”OUtL”
- this parameter determines the input value for which the output current is minimal
(0 mA or 4 mA depend of current output mode „
Omod
”).
“OUtH”
- this parameter determines the input value for which the output current is equal
20mA.
The output current value is calculated due to formulas given below:
I
out
=
W
−
" OUtL"
"OUtH"
−
"OUtL"
×
16
mA
4
mA
for output range
4
÷
20
mA
I
out
=
W
−
"OUtL"
"OUtH"
−
"OUtL"
×
20
mA
for output range
0
÷
20
mA
where “
W
” denotes the displayed value.
“
OutL
” parameter can be greater than “
OutH
”. In this case the conversion
characteristic is reversed, it means that if input value raises the output current falls.
”
Lo r
”, ”
Hi r
”
- this parameters define the output current range (maximum range 0 to 24 mA).
If calculated output value I
out
exceeds defined range then current output
generates the current equal to upper or lower border of the defined range. The
parameters define the percentage extension of nominal current range 4-20 mA
(with 0,1% resolution).
Parameter “
Lo r
” defines lower border of the range due to formula:
I
min
= 4 mA - 4 mA × “
Lo r
” %.
This parameter can be set from 0 to 99.9%.
Parameter
“Hi r”
defines lower border of the range due to formula:
I
max
= 20 mA + 20 mA × “
Hi r
” %.
This parameter can be set from 0 to 19.9%.
In example on page 39 of the
DISPLAY VALUES CALCULATION
paragraph
the procedure of the current outputs determining is presented in details.
“
AL
”
- this parameter determines the behaviour of current output if any critical situation
occurs. The parameter can be set to one of the values:
“noCH”
- current will not change,
“22.1”
- current will be set to 22.1 mA,
“3.4”
- current will be set to 3.4 mA,
“0.0”
- current will be set to 0 mA.
When the critical situation goes, the current will be set to value calculated due to
formulas given above.
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Summary of Contents for SRP-94-XC
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