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technical datasheettechnical datasheetFPS-I Seriesredundant <strong>power</strong> system for fieldbus network segments• Redundant <strong>power</strong> conditioner for highavailability applications• Replace <strong>power</strong> modules withoutresetting the fieldbus• High <strong>power</strong> output• Two levels of <strong>power</strong> redundancy• Component failure alarm• Integrated fieldbus terminator• Simplified <strong>power</strong> wiringThe MTL-Relcom redundant fieldbus <strong>power</strong>system (FPS-I Series) provides redundant<strong>power</strong> conditioning for fieldbus networksegments and facilitates the connection ofredundant bulk DC supplies. The system isfully ‘hot-swappable’ meaning that individual<strong>power</strong> conditioning modules and input <strong>power</strong>supplies can be replaced without interrupting<strong>power</strong> or communication on the fieldbussegment. An alarm circuit provides warning incase of a <strong>power</strong> conditioning module or input<strong>power</strong> supply failure. The system is designedso that <strong>power</strong> for several fieldbus segmentscan be provided from a single cabinet withminimal wiring.One fieldbus segment terminator is builtinto each <strong>power</strong> system. Each FPS includestwo plug-in <strong>power</strong> modules. These modulesfunction as <strong>power</strong> conditioners, providingimpedance between the input DC <strong>power</strong>supply and the fieldbus. This impedance isnecessary to prevent the input DC <strong>power</strong>supply from degrading the digital fieldbussignal.Each <strong>power</strong> module provides galvanicisolation of 250V ac between the fieldbussegment and the input <strong>power</strong> supplies. EachFPS-I supplies 350mA at 25V dc to the fieldbussegment. This output is maintained even ifonly one <strong>power</strong> module is installed. This levelof output <strong>power</strong> allows for construction of verylong fieldbus segments with a large number ofbus-<strong>power</strong>ed transmitters. Each FPS providesboth <strong>power</strong> conditioning and input <strong>power</strong>supply redundancy to each fieldbus segment.LED indicators on each <strong>power</strong> moduleand near each of the two input <strong>power</strong> supplyconnections give clear visual indication thatcomponents are functioning properly. Tominimize system downtime, an alarm circuitprovides notification if any of the <strong>power</strong>supply components fail. This allows failedcomponents to be replaced so that <strong>power</strong>system integrity is maintained.The alarm circuitry is galvanically isolatedfrom the fieldbus segments and input <strong>power</strong>supplies. The two <strong>power</strong> modules plug intoa DIN rail mounted backplane (RedundantCoupler or RCT) that contains one segmentterminator and provides connections to thetwo input <strong>power</strong> supplies, H1 host system,fieldbus trunk cable, and alarm circuitry.A bus configuration is used for the input<strong>power</strong> and alarm connections so that up toeight fieldbus <strong>power</strong> systems can be easilywired together to share input <strong>power</strong> suppliesand provide a common alarm circuit. Picturedabove is a Redundant Fieldbus Power Supplywith connections to the Fieldbus H1 hostshown at the top of the picture.Segments that do not require the highavailability provided by redundant <strong>power</strong>conditioning may be operated with only asingle FPS-IPM. To prevent an unwantedalarm condition due to the second FPS-IPMnot being fitted, a blanking module should beinstalled in the blank slot. These are suppliedin a pack of 10 as part number FPS-BLK10.EPS-FPSI RevC 310310www.mtl-inst.comenquiry@mtl-inst.com
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