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XNX Universal Transmitter2.2 Wiring the XNXThe XNX is available in 3 basic personalities (versions) whichsupport a variety of detectors and applications. Each of the availablepersonalities use dedicated interface boards. Pluggable terminal blocksare used for easy connection and service. The personality boards andoptional interfaces are enclosed in the electronics POD (Personality,Options and Display).The Personality circuit board determines the XNX behavior based onthe sensor type attached to the XNX interface (See Figure 2-7).The table below defines the three XNX transmitter configurations andthe sensors each support.Searchline ExcelXNX IR PersonalitySearchpoint Optima Plus Local/RemoteGeneric mA SensorsXNX mV PersonalityXNX EC PersonalityXNX EC SensorXNX EC Sensor Remote Mount Kit705 Local / Remote MPD Local (cat bead and IR) Sensepoint Local / Remote705HT Local / Remote MPD Remote Sensepoint PPM Local/RemoteSensepoint HT RemoteCautionBefore wiring the XNX, confirm the correct personality boards andoptions are installed.2.2.1 General Wiring ConsiderationsFor proper operation of the XNX Universal Transmitter and sensortechnologies, consideration of wiring induced voltage drops, transientelectrical noise and dissimilar earth ground potentials is imperative inthe design and installation of the system.Note:To maintain EMC integrity, wiring must be shielded by eitheran integral shield or run through conduit or pipe. Shield shouldprovide 90% coverage.LoadingWiring for DC power, 4-20mA signal, remote wiring to sensors mustbe sized sufficiently to provide sufficient voltages for the line lengthand the loads that will be used.IsolationIsolating power and signal carrying conductors is recommended.Circuit ProtectionSupply circuits must provide over current protection. Class 2 powersupplies are required for 24 volt DC supply. Consider inrush currentin specifying any DC supply. Power supply range is 16 to 32 VDC forEC and mV versions, 18 to 32 VDC for Searchpoint Optima Plus andSearchline Excel and 16 to 32 VDC dependent on the limitations ofdevice for the generic 4-20mA input.LoadsThe use of high inrush or inductive loads may affect the performanceof the XNX. For best reliability use resistive loads only.2.2.2 Distance Considerations for InstallationProviding power to the transmitter is the factor that will determine themaximum distance of the installation. The 4-20 mA output signal willeasily handle the distance back to the control equipment.Section 2 - Installation and Operation 2-52.2 Wiring the XNX
XNX Universal TransmitterThe primary factors determining distance are: minimum operatingvoltage of the transmitter and/or sensor; maximum current draw of thetransmitter/sensor, resistance of the wire used, power supply voltageand current capacity of power supply.An additional consideration is the type of installation; specifically, howmany transmitters/sensors are drawing power from the same powersupply and whether these transmitters are using the same pair of wires(“daisy-chain”) or have their own connections.Types of InstallationsThere are three basic types of installation: a single transmitter;multiple transmitters connected to a single power source; and multipletransmitters connected in a “daisy-chain” configuration.Single TransmitterThis is the simplest type of installation. It consists of a single XNXtransmitter installation per power source.Advantages:Class 2Power SupplyClass 2Power SupplyClass 2Power SupplyFigure 2-4. Single Transmitter Installation• Maximum distance between power source and transmitter.• Smaller power source.• If a power source fails, only one monitoring point fails.Disadvantages:• Multiple transmitters require multiple power sources.Multiple Transmitters Connected to a Single Power SourceThis is two or more transmitters sharing a single power source with eachtransmitter having its own dedicated wiring to the power source.Class 2Power SupplyFigure 2-5. Multiple Transmitters Powered by a Single Power SupplyAdvantages:• Maximum distance between power source and transmitters.• Fewer power sources.Disadvantages:• Larger power source will be needed.• If a power source fails, several monitoring points fail.Multiple Transmitters Connected in a “Daisy-Chain”ConfigurationThis configuration consists of two or more transmitters installed ina line. The power connections are installed as an extension of theprevious transmitter, with the first transmitter being the only oneactually wired to the power source.Class 2Power SupplyFigure 2-6. “Daisy-Chained” Transmitters from One Power SupplyAdvantages:• Less wire needed for installation.• Fewer power sources.Section 2 - Installation and Operation 2-62.2 Wiring the XNX
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