I agree with all of you, I don't think we are fully to the bottom of this yet. However in the mean time I did prove that it is not a mechanical or motor issue.
Update Problem Solved!
Thank you everyone for your feedback, mostly for questioning the integrity of the "VFD Specialist" and pointing me back to the vfd after he said it was running fine. I had another local VFD company come out for a more thorough testing on the vfd components like jraef...
The thing that seems strange to me is that the issue seems to have gotten worse over a short period of time with the original motor. It has quickly gone from a smooth running motor to bad vibrations (2x running speed), and now to essentially non-functional. While in the mean time we have...
jraef,
Thank you very much for your comments.
1) That was my first concern, the previous bearings that were on the motor showed zero signs of EDM damage.
2) We did go through all drive settings initially to ensure it was not a setting and it is on V per Hz mode.
3) I was not there when the VFD...
I am working on a 250 HP 3 phase 480 V 1800 rpm motor on a vertical turbine pump that is run on a saftronic vfd, it had some vibration to it that led to the bearings being replaced and re-installed. Once installed it ran smoothly and we put the pump back in service, a week or two later it began...
