Eaton 9372-FB-P Series Instruction Manual

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Eaton 9372-FB-P Series Instruction Manual Manual pdf 22 page image

INM 9370-RD Rev 5205.6 Regular Maintenance checksCheck the general condition of the installation occasionally to ensure that nodeterioration has occurred. At least every two years (and more frequently for harsh,dusty or dirty environments) check:• the condition of all wire connections/terminations/screens.• that all of the fixing and cover screws and blanking plugs are secure and thebreather is clear.• that there are no signs of damage or corrosion.• that the level of accumulated dust on the enclosure does not exceed 5mm.In addition, take advantage of plant maintenance shutdown periods or whenever thearea is known to be non-hazardous, to check wiring quality by confirming that the dcvoltage on the fieldbus trunk, when measured at the enclosure, is >16V. This can beperformed using a multimeter or an FBT-6 fieldbus tester.5.6.1 Proof testing of redundancy mechanismThe Fieldbus Barrier is designed to automatically transfer spurs between the‘active’ to the ‘standby’ barrier modules in the event of internal electronic failures.This mechanism may be proof-tested by manually forcing the transfer of all spursbetween the modules using the Fail-over buttons located on the module carrier(see clause 5.2.2 and diagram 5.1). Pressing the A > B button will force all spurs totransfer from module A to module B. Pressing the B > A button will return the spursto module A.Operating the Fail-over buttons will reliably transfer all spurs without interruptingthe fieldbus communication; however, repeated operation is not advised if theFieldbus Barrier is operating in a live fieldbus segment. Use of the Fail-over buttonsis therefore recommended only for periodic proof-testing during plant shutdowns,and for the purpose of module replacement.NOTEOperation of the Fail-over buttons will not cause active spurs to be transferedto a missing or failed barrier module.6 TroubleshootingThe Redundant Fieldbus Barriers are fitted with LED indicators to assist the userin fault identification.Consult the following tables to understand the meaning of the LED states.Power LED (Green)The Fieldbus Barriers inside the enclosure are fitted with LED indicators to assist theuser in fault identification. Consult the following tables to understand the meaning ofthe LED states.NOTEThe Power LED will not light until the voltage at the barrier has risen to a valueof at least 15.7V, but could remain lit even after the voltage has dropped toaround 13.0V. DO NOT assume the Power LED indicates a voltage of 16V ormore.Power LEDColour Description VisualGreen ON steady Trunk power presentGreen OFF Insufficient or no trunk power