APG IRU-9400 user manual - Manual (Page 13)

Rev. B1, 3/10 IRU Series
13
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Isolated 4-20 mA Wiring (IRU-2003 only)
The IRU-2003 is equipped with an isolated 4-20 mA output. This means that
the 4-20 mA circuit can be powered by the receiver (such as a datalogger) or
the source that is powering the receiver. Isolated wiring is used to prevent
potential ground loops that can exist in instances where the IRU and receiver are
not sharing the same power source. The 4-20 mA circuit can also be wired as a
standard current sourcing 4-20 mA signal simply by powering the circuit from
the same power source used by the main IRU sensor circuit
4-20 mA Output
(IRU-xxx3, excluding IRU-2003)
3-Conductor Cable
Red ......................+24 Vdc
Black ...................Ground
White ...................4-20 mA Output
4-20 mA with 2 NPN Trip Outputs
(IRU-xxx5)
5-Conductor Cable
Red ......................+24 Vdc
Black ...................Ground
Orange ................4-20 mA Output
White ...................NPN 1
Green ..................NPN 2
+24
Vdc
Ground
Clock
Syn
c
Digita
lOutput
4-20m
a
(Input
Power)
4-20m
a
(Output
)
Sensor Wiring Terminal Strip
+24
Vdc
Ground
Clock
Syn
c
Digita
lOutput
4-20m
a
(Input
Power)
4-20m
a
(Output
)
Sensor Wiring Terminal Strip
Vdc
Source 1
Vdc
Source 1
Vdc
Source 2
(when applicable) (when applicable)
Source powering receiver
or
Source provided by receiver
To receiver common
4-20 mA signal
to receiver
To receiver common
4-20 mA signal
to receiver