Eaton Crouse-Hinds F892 Instruction Manual

7INM F892 Rev 15 2 Power A and Power BPower A supplies Power Module A and Power B supplies Power Module B. Each moduleprovides DC power to all eight segments - see Figure 4. DC supply connections areas follows:Power A Power BPin No. Connection Pin No. Connection2 +ve 4 +ve1 -ve 3 -veCable lengths on the Power connectors should not exceed 30m nor be routed outsidethe building.5 2 1 RedundancyFor redundant operation, F801 or F802 modules must be fitted in Power Module Aand Power Module B locations. For non-redundant operation fit an F801 or F802 inthe Power Module A location and apply power to Power A terminals. The F800-BLKwould then be placed on the Power Module B connector to allow the alarm circuit tofunction. Power must be connected to Power B terminals if live replacement of PowerModule A is necessary since Power B terminals feed the Power Module B connector.5 2 2 TerminatorA single terminator is provided automatically on each segment whether one or twoPower Modules are used.5 3 Alarm ConnectionIn an alarm condition a normally closed, galvanically-isolated relay contact in each F801or F802 goes to an open-circuit condition. These relays are connected in series on theF892-CA carrier and are presented at terminals as follows:AlarmPin No. Connection91 +ve92 -veIn non-redundant applications using a single Power Module, the alarm connectionson the carrier will be open-circuit, indicating a permanent alarm condition unless theF800-BLK module is fitted in place of the missing Power Module.