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Hi,
In fr9E that has Mark VIe control sys, with 3 turbine bearings (bb1 to bb5) & 2 gen bearings (bb9 to bb12), we had problem with reading of BB5 (39v-3b) & BB11 (39v-5a). Operator reported bb5 reading till 17mm & bb11 till 13mm, on checking trends it was found that multiple spikes came in both at the same time, also proximity reading (39vs-31,32, 101,102) found ok in BN system.
Further it was checked at marshalling tb, cable of bb5 found loose, hence l39vt was forced & cable removed, but on removing it was found that bb11 signal was also generated spike. After some secs bb11 become stable & bb5 io bad in Mark VIe, this activity of removing cable of bb5 done multiple times. All times effect was found in bb1 also along with bb5.
Note:-field jb's of both are quite away from each other,also marshalling tb's are also at a distance, so no chance of inter change.
Request experts to help in resolving issue(can it be due to shield or some interferences)???
Regards,
Yasin
In fr9E that has Mark VIe control sys, with 3 turbine bearings (bb1 to bb5) & 2 gen bearings (bb9 to bb12), we had problem with reading of BB5 (39v-3b) & BB11 (39v-5a). Operator reported bb5 reading till 17mm & bb11 till 13mm, on checking trends it was found that multiple spikes came in both at the same time, also proximity reading (39vs-31,32, 101,102) found ok in BN system.
Further it was checked at marshalling tb, cable of bb5 found loose, hence l39vt was forced & cable removed, but on removing it was found that bb11 signal was also generated spike. After some secs bb11 become stable & bb5 io bad in Mark VIe, this activity of removing cable of bb5 done multiple times. All times effect was found in bb1 also along with bb5.
Note:-field jb's of both are quite away from each other,also marshalling tb's are also at a distance, so no chance of inter change.
Request experts to help in resolving issue(can it be due to shield or some interferences)???
Regards,
Yasin