P45000
12
2.6 Functional Description
Measuring Functions
The transducer is used for the conditioning, filtering, and galvanic isolation of high voltages. The trans-
ducer transfers analog signals from what is usually a high potential to a near-ground potential in order
to be able to further process the detected signals safely and with low interference. An analog signal is
emitted at the output of the transducer, which is an image of the analog measuring signal at the input
of the transducer. The amplitude of the input voltage may be up to several kilovolts, depending on the
device design. Both unipolar and bipolar input signals can be processed. Either a unipolar or bipolar
current signal is provided at the output of the transducer.
The 2-port isolation, i.e. the galvanic isolation between input and output/power supply, ensures per-
sonal and plant safety as well as increasing the signal integrity of the measuring device. The enclosure
is made from silicone-free enclosure materials. The isolation characteristics are achieved, for example,
by potting with a silicone-free polyurethane casting resin.
Internal device diagnostics
The analog output signal (measuring signal) is set to a defined value in the event of an error.
Live zero function
The live zero function facilitates monitoring of the output signal. The 10
…
50 mA output signal (live
zero) can be used to detect interruptions, or short circuits of the output cables. When doing so, output
currents < 9 mA are to be interpreted as an error.
Block diagram (example)
Input
HV
+
P45000
HV
-
Signal
Power
Output/Power
Pwr
+
Pwr
-
I
out
R
M
U
HE
U
HE
U
in
I
out
Summary of Contents for P45000
Page 37: ...P45000 37 Notes ...
