User manual - METER PDU-4x0-W
”OUtL”
- this parameter determines the input value for which the output current is equal
4mA.
“OUtH”
- this parameter determines the input value for which the output current is equal
20mA.
The output current value is calculated due to formula given below:
I
out
=
W
−
" OUtL"
"OUtH"
−
"OUtL"
×
16
mA
4
mA
for output range
4
÷
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 2,8 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 29.9%.
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 47 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,
When the critical situation goes, the current will be set to value calculated due to
formulas given above.
If parameter
“Omod”
is set to
“4-20”
the “critical situation” means that
permissible
measurement range
is exceeded.
If parameter
“Omod”
is set to
“modb”
, the “critical situation” means communication
delay (when no data is received) longer than
“mbtO”
parameter (see description:
“rS”
menu
).
33
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