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Schleifenstromversorgungsmodus
(nur 789)
Der Schleifenversorgungsmodus kann zum Einschalten
eines Prozessinstruments (Transmitter) verwendet
werden. Im Schleifenversorgungsmodus agiert das
Messgerät wie eine Batterie. Das Prozessinstrument
reguliert den Strom. Zur gleichen Zeit misst das
Messgerät den Strom, den das Prozessinstrument zieht.
Das Messgerät liefert Schleifenstrom mit 24 V
Gleichstrom, Nennspannung. Für Kommunikation mit
HART- und anderen Smart-Komponenten kann ein
interner Reihenwiderstand von 250 Ω durch Drücken von
J (blau) zugeschaltet werden. Siehe Abbildung 3.
Erneutes Drücken von J (blau) schaltet diesen internen
Widerstand aus.
Wenn Schleifenversorgung aktiviert ist, ist das Messgerät
zum Messen von mA konfiguriert und > 24 V Gleichstrom
wird zwischen den Anschlüssen mA und A eingespeist.
Der Anschluss mA ist die gemeinsame Leitung, und der
Anschluss A liegt bei > 24 V Gleichstrom. Das Messgerät
in Serie mit der Instrument-Stromschleife schalten. Siehe
Abbildung 4.
20
22
24
26
28
30
32
0 4 8 12162024
Schleifenspannung m./ 250
Schleifenspannung o./ 250
Spannung (V)
Stromstärke (mA)
any020f.eps
Abbildung 3. Schleifenspannung und Strom
32


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