turbine vibration

Did you put it together correctly (no spare bolts let over).

Seriously thou have you gone back to the manufacturer and/or installer directly and asked their advice as it could be any number of things (from blade imbalance right thru to improper foundation build).

It could even be something as simple as too much or too little much oil swirling around in the bearings. Give the manufacturer a call, it could save you a lot of grief.

TT3

The key to your problem is in the timing. When did it happen? If there was a change during operation, and that covers increased or decreased vibration, then you have a problem.

The severity of your problem is the next consideration. If you are using the manufactures recommendation relative to magnitude, you are probably concerned about a conservative number.

In any case if you are not comfortable with analyzing and curing the problem you need to seek help from another source. Or elaborate a little more and we may be able to help you out.