Mircom OpenBAS-HV-NX10 Series Installation Manual page 27

Table 4 Analog Input Wiring (Continued)
Type of field device Power source
2-wire transducer with 4-
20 mA or 0-20 mA output
Connect an external 250
Ω ½ Watt 1% load
resistor in parallel
between the universal
input terminal and 0V to
provide a return path for
the transducer signal
current.
2-wire transducer with 4-
20 mA or 0-20 mA output
Connect an external 250
Ω ½ Watt 1% load
resistor in parallel
between the universal
input terminal and 0V to
provide a return path for
the transducer signal
current.
2-wire transducer with 4-
20 mA or 0-20 mA output
Connect an external 250
Ω ½ Watt 1% load
resistor in parallel
between the universal
input terminal and 0V to
provide a return path for
the transducer signal
current.
3-wire transducer with 4-
20 mA or 0-20 mA output
Connect an external 250
Ω ½ Watt 1% load
resistor in parallel
between the universal
input terminal and 0V to
provide a return path for
the transducer signal
current.
24 VDC power supply
common to field device
and controller.
External power supply for
field device (depends on
field device requirements)
and 24 V external power
supply for controller.
Connect the negative or
common of both power
supplies to the 0V
terminal of the controller.
External power supply for
field device (depends on
field device requirements)
and 12 VDC external
power supply for
controller.
Connect the negative or
common of both power
supplies to the 0V
terminal of the controller.
24 VAC power supply
common to field device
and controller.
Wiring diagram
24 VDC
Field Device
+
-
0 V
Field Device
+
+
Power Supply
-
-
Field Device
+
+
Power Supply
-
-
24 VAC
Field Device
+
Signal
-
0 V
Field Wiring
Controller
24V
UI#
0V
Controller
+
24V
24 VAC or VDC
Power Supply
UI1
-
0V
Controller
+
+12
12 VDC
Power Supply
UI1
-
0V
Controller
24V
UI#
0V
27 (45)