Mircom OpenBAS-HV-NX10 Series, Installation Manual

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Field Wiring
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.
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.
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.
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.
J or K Thermocouples
When using J or K
thermocouples, install a
x200 low offset amplifier.
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.
J or K Thermocouples
When using J or K
thermocouples, install a
x200 low offset amplifier.
12 VDC power supply
common to field device
and controller.
Table 4 Analog Input Wiring (Continued)
Type of field device Power source Wiring diagram
24V
0V
UI1
ȍ
Controller
Power Supply
+
-
24 VAC or VDC
Power Supply
+
-
+
Signal
-
Field Device
+12
0V
UI1
ȍ
Controller
Power Supply
+
-
12VDC
Power Supply
+
-
+
Signal
-
Field Device
+12
Signal
0V
J or K
thermocouple
+
-
+
-
x200
instrumentation
amplifier
UI#
0V
24 V
0 V
+12
24 V
Controller
+12
Signal
0V
J or K
thermocouple
+
-
+
-
x200
instrumentation
amplifier
0 V
12
VDC
UI#
+12
0V
Controller