4.6 Analogue output (option)
4 Measurement functions
Technical description
108
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VM55.EN005
4.6.
Analogue output (option)
A device with the mA option has one configurable analogue
output. The resolution of the analogue output is 10 bits
resulting current steps less than 25
A. The output current
range is configurable allowing e.g. the following ranges: 0 .. 20
mA and 4 .. 20 mA. More exotic ranges like 0 … 5 mA or 10 …
2 mA can be configured freely as long as the boundary values
are within 0 … 20 mA.
Available couplings to the analog output:
f
U12, U23, U31
UL1, UL2, UL3
Uo
4.6.1.
mA scaling example
In this chapter, there is an example configuration of scaling the
transducer (mA) output.
Example 1
Coupling
=
Uline
Scaled minimum
=
0 V
Scaled maximum
=
15000 V
Analogue output minimum value
=
4 mA
Analogue output maximum value
=
20 mA
Figure 4.6.1-1. Example of mA scaling for Uline, the average of the line-to-
line voltages. At 0 V the transducer ouput is 4 mA, at 15000 V the output is
20 mA