Eaton Crouse-Hinds F892 Instruction Manual

1INM F892 Rev 1MTL F892 - 8 Segment Redundant Fieldbus Power Supply for use with thenon-proprietary cabled systemsFigure 1 - F892-PS1 OVERVIEWThe F892 redundant fieldbus power supply is designed to provide redundant powerfor eight (8) Foundation fieldbusTM H1 segments. Pluggable connectors are providedon the F892-CA module carrier for connection to the eight segments. Fixed screwterminals are used for the 8 Host segment connections. Power for the eight fieldbussegments is provided by two F801 or F802 Power Modules mounted to the carrierand operating in a redundant configuration. Failure alarms, galvanic isolation, powerconditioning and segment termination are incorporated into each Power Module. Asingle F801 or F802 module may be used where redundancy is not required.2 DESCRIPTIONFor maximum reliability, the module carrier contains no components and only providesinterconnections between the power modules and the external connections. Thecarrier circuit board is supported in a rigid metal frame that protects it from mechanicaldamage. Secure DIN-rail mounting is provided by integrated retaining screws. ThePower Module provides galvanic isolation between the 24V DC input power and thefieldbus segments, as required by the IEC61158-2 fieldbus standard and the FieldbusFoundationTM FF-831 validation test for fieldbus power supplies. There is also galvanicisolation between the fieldbus segments, thereby preventing cross-talk betweensegments in the event of ground faults in the field wiring. Each segment has its own