Intermittent Bently Nevada Spikes

K

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KSB

We have a Bently 3300 system monitoring the bearings of a GE 7FA turbine. Lately we have seen intermittent spikes in the vibration readings for both the #1 and #2 turbine bearings. This is occurring while the unit is offline and off turning gear (rotor stationary).
The highest spikes are seen on the x and y of the #2 bearing but we see simultaneous spikes on the #1 bearing.

Because the issue is appearing on several channels, I suspected that the issue has nothing to do with any single probe/prox/cable and more likely was a Mark VI TVIB issue. The card was replaced but the problem did not go away.

Has anyone else seen this issue?
 
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