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XNX Universal Transmitter Technical Manual - Page 39

For XNX UNIVERSAL.

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XNX Universal Transmitter
Section 2 - Installation and Operation
37
2.2.4
4-20mA Output, Common Connections, and
Power Settings
TheXNXUniversalTransmitterallowstheusertocongure
the 4-20mA output to Sink, Source, or Isolated mode
operation via two programming switches on the POD
1
. The
SwitchCongurationtableshowstheS1andS2settingand
correspondingoutputconguration.
Switch Conguration
Mode S1 S2
Source Down Up
Sink Up Down
Isolated Down Down
Mostcontrollersinthemarketwillacceptsource-congured
devices.Sink-conguredsignalsareusedinoldertechnology
controllers, which reduce the need for complete system
upgrades.In isolated-signal devices, if the controller fails or the
mAsignalwiresaredisconnectedorbroken,theelddevicewill
remain operational. Most controllers in the market will accept
isolatedcongureddevices.
Power and 4-20mA connections are made at TB-1 and are
identical for the EC, IR, and mV Personality Boards. For user
convenience, a second set of +Ve and -Ve power terminals have
been provided to eliminate the need for a secondary junction
box in multi-node systems when used with the supplied terminal
jumpers.
The total load resistance for the 4-20mA output should be
kept lower than 500Ω, including the resistance of the properly
selected 4-20mA cable and input impedance of the equipment
tobeconnnected.Theminimumloopimpedenceis200ohms;
1 The 4-20 mA output state is refreshed at least every two seconds (once per second is typical).
the maximum is 500 ohms. If the 20 mA output is not used, a 500
ohm resistor must be installed.
The XNX Universal Transmitter power consumption is dependent
onthesensorandoptionsforthespecicconguration.For
proper operation, the input voltage must be maintained at 16 to
32 VDC for EC and mV units and 18 to 32 VDC for IR units.
Controller
+VE
Signal
-VE
R
L
1
2
3
1-1
1-5
1-3
+V
+mA
-V
XNX
XNX Sink Configuration
Current
Flow
Figure 36. Sink wiring for XNX
XNX Source Configuration
Controller
+VE
Signal
-VE
R
L
1
2
3
1-1
1-6
1-3
+V
-mA
-V
XNX
Current
Flow
Terminate cable screen at the detector or controller, not both.
Figure 37. Source wiring for XNX
Controller
+V1
+V2
-V2
1-1
1-5
1-6
+V
+mA
-V
XNX
1-3
-mA
-V1
XNX Isolated Configuration
Figure 38. Isolated wiring for XNX
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