KROHNE MFC 300 EN - Manual (Page 42)

4
ELECTRICAL CONNECTIONS
42
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
4.8 Description of the inputs and outputs
4.8.1 Current output
• All outputs are electrically isolated from each other and from all other circuits.
• All operating data and functions can be adjusted.
• Passive mode: external power U
ext
≤ 32 VDC at I ≤ 22 mA
• Active mode: load impedance R
L
≤ 1 kΩ at I ≤ 22 mA;
R
L
≤ 450 Ω at I ≤ 22 mA for Ex i outputs
• Self-monitoring: interruption or load impedance too high in the current output loop
• Error message possible via status output, error indication on LC display.
• Current value error detection can be adjusted.
• Automatic range conversion via threshold or control input. The setting range for the
threshold is between 5 and 80% of Q
100%
, ± 0...5% hysteresis (corresponding ratio from
smaller to larger range of 1:20 to 1:1.25).
Signaling of the active range possible via a status output (adjustable).
• Forward / reverse flow measurement (F/R mode) is possible.
INFORMATION!
The current outputs must be connected depending on the version! Which I/O versions and
inputs/outputs are installed in your signal converter are indicated on the sticker in the cover of
the terminal compartment.
INFORMATION!
For further information refer to Connection diagrams of inputs and outputs on page 49 and refer
to
Technical data on page 134.
DANGER!
For devices used in hazardous areas, additional safety notes apply; please refer to the Ex
documentation.
.book Page 42 Monday, February 6, 2012 11:01 AM