XNX Universal Transmitter - Merkantile

XNX Universal TransmitterEach of the personalities use a single terminal block for connectionwith the exception of the IR personality, which necessitates the useof a second terminal block.The personality boards also provide a dedicated pair of jumperswitches to define output of the XNX as isolated 4-20mA, Sink 20mAor Source 20mA as well as a service jumper to allow power to theloop to continue if the XNX is being serviced. A separate connectoris used to activate local HART ® (see Section 2.3.1).Local HART ® provides an external access to control the XNX. An ISbarrier inside the XNX allows the user to attach an external handheldinterrogator for programming and configuration. The externalinterface is installed in the lower left cable/conduit entry of the XNXand is intrinsically safe (IS).Note:Open loop faults are not available due to HART and Modbusinterfaces where a 4-20 may not be used. In this case, openloop, 0mA, must be used as the diagnostic.The Option circuit boards vary dependent upon the option selected atorder time. Only one of the 2 available interface options (Modbus ® orRelays) can be attached to the XNX. When installed, connections tothe options are made to connectors at the bottom of the POD.2.2.4 4-20mA Output, Common Connections and PowerSetting 4-20mA operation; S1 & S2The XNX Universal Transmitter allows the user to configure the4-20mA output to Sink, Source or Isolated mode operation via twoprogramming switches on the POD. The table below shows the S1and S2 setting and corresponding output configuration.S1S2Source Down UpSink Up DownIsolated Down DownPower and 4-20mA connections are made at TB-1 and are identicalfor the EC, IR and mV Personality Boards. For user convenience asecond set of Terminals have been provided to eliminate the need fora secondary junction box in multi node systems when used with thesupplied terminal jumpers.Controller+VE1R LSignal-VEController+VE231Signal2R L-VECurrentFlow1-11-51-3+V+mA-VXNXXNX Sink ConfigurationFigure 2-8. Sink wiring for XNXTerminate cable screen at the detector or controller, not both.3CurrentFlow1-11-61-3+V-mA-VXNXXNX Source ConfigurationFigure 2-9. Source wiring for XNXSection 2 - Installation and Operation 2-102.2 Wiring the XNX