Fema I3 Series, User Manual, Page: 5 / 12

SERIES I3 · Model I3D
Section OEM . ISOLATED SIGNAL CONVERTERS
www.fema.es 5
Table 5 | INPUT signal connections
INPUT
signal
Input terminals Connections
7 8 9
4/20 mA
passive input Vexc
mA-
7 8 9
mA+ (+15 Vexc)
mA-
4/20 mA
active input
mA- mA+
7 8 9
mA+
mA-
0/10 Vdc
(2 wires)
+Vdc common
7 8 9
common
+Vdc
0/10 Vdc
(3 wires)
Vexc +Vdc common
7 8 9
+15 Vexc
common
+Vdc
ACTIVE AND PASSIVE SIGNALS
The instrument can be configured to measure process signals in 4/20 mA
(active and passive) and 0/10 Vdc. The instrument has two outputs :
• output 1 is fixed to 4/20 mA (active and passive).
• output 2 is fixed to 4/20 mA (active and passive).
To select the ‘ active ’ or ‘ passive ’ mA versions at the input and output
signals, configure the connection terminals according to your needs.
• active mA inputs are powered by an external element, and the
instrument receives an active mA signal.
• passive mA inputs are powered by the instrument, by using the
+15 Vdc (terminal 7) to power the transducer.
• active mA outputs are powered by the instrument.
• passive mA output are powered by an external element and the
instrument only controls the value of the mA, but it does not provide
power to the output loop.