Trying to diagnose some vibration issues here in a large Combustion Air Fan with a VFD driven electric motor. Bearings are oil lubricated rolling bearings. Frame is rigidly bolted to a concrete foundation and properly shimmed. Rotating frequency is 3042 rpm maximum, and rated frequency of 2982 rpms.
During high load operation we had a high vibration of motor on axial side. The value spiked to 8 mm/sec where, horizontal and vertical vibrations remained below 2.5 mm/sec. The vibrations were higher on the motor side.
Does anyone have any insight here as to what could be causing this? Or any suggestions of things to check?
Thanks in advance for any suggestions!
During high load operation we had a high vibration of motor on axial side. The value spiked to 8 mm/sec where, horizontal and vertical vibrations remained below 2.5 mm/sec. The vibrations were higher on the motor side.
Does anyone have any insight here as to what could be causing this? Or any suggestions of things to check?
Thanks in advance for any suggestions!