Mircom OpenBAS-HV-NX10 Series Installation Manual page 28

Table 4 Analog Input Wiring (Continued)
Type of field device Power source
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.
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.
J or K Thermocouples
When using J or K
thermocouples, install a
x200 low offset amplifier.
J or K Thermocouples
When using J or K
thermocouples, install a
x200 low offset amplifier.
28 (45)
External power supply for
field device (depends on
field device requirements)
and 24 V external power
supply for controller.
Connect the negatives or
commons 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 negatives or
commons of both power
supplies to the 0V
terminal of the controller.
24 VAC or VDC power
supply to controller.
The controller provides
the 12 VDC and a
maximum current of
250 mA to the field
device.
12 VDC power supply
common to field device
and controller.
Wiring diagram
Field Device
+
+
Power Supply
Signal
-
-
Field Device
+
+
Power Supply
Signal
-
-
x200
instrumentation
amplifier
J or K
+ +
thermocouple
- -
x200
instrumentation
amplifier
J or K
+ +
thermocouple
- -
Field Wiring
Controller
+
24V
24 VAC or VDC
Power Supply
UI1
-
0V
Controller
+
+12
12VDC
Power Supply
UI1
-
0V
24 V
24 V
+12 +12
Controller
Signal
UI#
0V 0V
0 V
12
Controller
VDC
+12 +12
Signal
UI#
0V
0V
0 V