Vibration for motor of milling machine

hi everyone !
We have a milling machine for milling corn, its full speed is 3000RPM and been driven by inverter . Motor from ABB and couple with hammer rotor by metal ribbon coupling . The hammer rotor is balanced on workshop with accepted value under 1 mm/s RMS . Now we have a trouble look like critical vibration at motor .At the beginning we though the troible come from the bearing of motor that not is not suitable for INVERTER . So we change it to isolated bearing . So on , we started machine again and monitor its value but do not meet what we expecting as well .at horizontal location at inboard motor the vibration is over 20mm/s overall. alignment and softfoot we checked is ok . Somebody can drop some comment to help ? BR

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Hi Markpl ! we already uncoupled and the new motor ABB have its normal condition . Even , we changed the power supply to check. Overall , No abnormal points are found as uncouple as well . the thing as the machine on load during production then vibration has raise up vibration definately . Frankly, i do not why the vibration at 1X up to over 20mm/s as horizontal because the rotor and further  more with motor ABB are balanced yet and waveform for velocity not identify more clear .

thanks KISHORE KUMAR . i still be strong believe in your advicement . in fact , we have the modern  equiment to figure out softfoot  issue and seem its performance not good. maybe check it by traditional method with dial gauge. however , if softfoot or structural loosen it will be presented and impact to waveform , right ? finally i appreciate thanks your comment.

Husky100,

Can you tell and show us what the frequency difference between the 1x impacts are in your acceleration waveform of the motor inboard vertical?

Also, is this data from the "new" motor? And is the data taken with the motor coupled and running the mill loaded?

Can you post a picture of the actual machine instead of just a generic picture of a mill?Waveform Impacts and sidebands left and right of them

See the attached image.

Thanks and Have a Great Day,

Ralph

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hi RALPH STEWART! thanks for your further infor. i would like to give you some usable answer and btw you can get the total visual for analyze waveform.

-this data is recorded for new motor with being  coupled with rotor during working with real production.

-Due to our setting for analog analyzer instrument , it not calculate the delta difference frequency. regarding to 1x impact you are right it rerquency at 0.01 sec interval. To get more detail i can update with waveform for this note with revolution number instead of timing and hope yu can find some more detail.

-the real machine pls find the attached file . 

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