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John from PA

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Reply with quote  #31 
Quote:
Originally Posted by Ahmed525


Induction motor


The reason I had inquired about motor type is the use of the “type H” coupling, which others have mentioned is somewhat unusual for this application, but might have been expected if the motor was a synchronous type.

The type H I’m familiar with is made by Lovejoy and uses elastomeric “cushions” (Lovejoy’s terminology) which are radially removable in their design.  Assuming you have something similar, have you examined them for condition?

Also, have you had time to run a test yet with the coupling halves rotated 180 deg to each other, as others have suggested?
fburgos

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Reply with quote  #32 
I'm with Danny and Mark, I don't trust dial indicator alignment unless I see a report with the measured sag
John from PA

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Posts: 963
Reply with quote  #33 
Quote:
Originally Posted by fburgos
I'm with Danny and Mark, I don't trust dial indicator alignment unless I see a report with the measured sag


Also, OP has posted "We did alignment by(dial gauge and feeler gauge)."  

Maybe rim and face?????????  
Ralph Stewart

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Reply with quote  #34 
Quote:
   #17 
 
You can see full angles for each side of motor and fan...

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Click image for larger version - Name: IMG_20200323_031159.jpg, Views: 15, Size: 131.76 KB 



A question on your phase and amplitude picture.

Thanks,
Ralph

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jpeg Plotted CCW.jpg (107.93 KB, 17 views)


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Ralph Stewart
AlertAnalytical.com

Danny Harvey

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Reply with quote  #35 
"@Danny I think he’s relying on the spectra to make a decision on the alignment rather than using alignment set."

I think so too.

Misalignment is not always reflected in the spectrum.
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