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Gebruikersaanwijzing
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Lusvoedingsmodus (alleen model 789)
De lusvoedingmodus kan worden gebruikt om een
procesinstrument (transmitter) van stroom te voorzien. In
de lusvoedingmodus werkt de meter zoals een batterij.
Het procesinstrument regelt de stroom. Tegelijkertijd meet
de meter de stroom die door het procesinstrument wordt
afgenomen.
De meter levert een lusvoeding van nominaal 24 V DC.
Een interne serieweerstand van 250 Ω kan worden
ingeschakeld voor communicatie met HART- en andere
slimme apparaten door op J (blauw) te drukken. Zie
afbeelding 3. Door J (blauw) nogmaals in te drukken,
wordt deze interne weerstand uitgeschakeld.
Als lusvoeding is ingeschakeld, is de meter
geconfigureerd voor het meten van mA en wordt er >24 V
DC over de mA- en A-aansluitingen aangevoerd. De
mA-aansluiting is de aarding en de A-aansluiting is >24 V
DC. Sluit de meter aan in serie met de stroomkring van
het instrument. Zie afbeelding 4.
20
22
24
26
28
30
32
0 4 8 12162024
Kredsspænding m/250
Kredsspænding uden/250
Spænding (V)
Strømstyrke (mA)
aod020f.eps
Afbeelding 3. Lusspanning versus-stroom
32


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