power Supplies.pdf

technical datasheettechnical datasheetF690Aredundant fieldbus power systemThe F690A is part of a range of MTL-Relcom redundant fieldbus power systems(FPS-Series), which provides redundant powerconditioning, and facilitates the connection ofredundant input power supplies. The F690Asupports four fieldbus segments and providesredundant fieldbus power conditioners forhost systems that do not use a “standard”system cable to connect to the fieldbus.Each fieldbus segment has two FPS-IPM plugin,power-conditioning modules that provideimpedance between the input DC powersupply and the fieldbus. This impedance isnecessary to prevent the incoming DC powersupply from degrading the digital fieldbussignal. A fieldbus segment terminator is builtin to each segment.A single or redundant host connectionoption is provided. The single connectionoption is ideal for use with Emerson’s DeltaV system which has one segment connectionin single and redundant fieldbus cardconfigurations. The redundant host connectionoption would suit the ABB LD800HSE linkingdevice when redundant linking devices areselected.A separate FPS-ALM alarm module,galvanically isolated from the fieldbussegments and input power supplies, monitorsthe eight power conditioning modules and theredundant power inputs. If a fault is detectedon any of these components, the alarm relayopens and a red alarm LED indicates a faultcondition. This allows failed components tobe replaced so that power system integrityis maintained. Green LEDs on each powermodule and two input power supply LEDs onthe alarm module give clear visual indicationthat components are functioning properly.Left- and right-hand carrier versions areavailable, providing flexibility in cabinet design.The F690A-Lx kits provide field connectionson the left side of the carrier while the F690A-Rx kits have them on the right. Accessoriesare available for T-section and G-section DINrail or surface mounting.The F690A provides connections tofieldbus host cards and field wiring. Fieldconnections are available with either screwterminal (-PB & -PS versions), or pluggablespring clamp terminals (-PA & -PC versions).For redundant operation, two separate DCpower supplies should be connected to eachF690A. Connections are also provided forredundant power input, screen grounding andthe alarm contacts. The alarm contacts fromseveral backplanes can be bussed togetherand connected to a control system DI channel.Each segment is supplied with 350mA at 25VDC. This output is maintained, even if only onepower module is installed per segment. Thislevel of output power allows for constructionof very long fieldbus segments with a largenumber of bus-powered transmitters.The system is fully ‘hot-swappable’ meaningthat individual power conditioning modulesand input power supplies can be replacedwithout interrupting power or communicationon the fieldbus segment.www.mtl-inst.comenquiry@mtl-inst.com