Honeywell XNX - 6 Powering the XNX for the First Time; 6.1 XNX Units Configured for EC, mV, and IR (except Searchline Excel)

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