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bouramoh

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Reply with quote  #1 
Bon soir
J'ai fait un test a vide sur un moteur 5500v ,215kw,2980 tr/min de marque ABB et j'ai remaque une amplitude élevé au niveau des ces paliers jusqu'a seuil de déclenchement qui est fixer a 7 mm/s , l'analyse spectrale montre un pic tres important a deux fois la fréquence d'alimentation 2x50hz et quand je coupe le courant cet pic a disparue directement.
A votre avis quelle sont les causes et remèdes pour cette anomalie
Et merci

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Ralph Stewart

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Reply with quote  #2 
Here is a rough translation of "bouramoh"'s posting. [smile]


Quote:
"Good evening
I did a vacuum test on an ABB brand motor 5500v, 215kw, 2980 rpm and I remake a high amplitude at these bearings until the trigger threshold is set at 7 mm / s, the spectral analysis shows a very large peak at twice the power frequency 2x50hz and when I cut the current this peak has disappeared directly.
In your opinion what are the causes and remedies for this anomaly?
And thank you"
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John from PA

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Reply with quote  #3 
Quelle est votre certitude que la fréquence est exactement 2X ligne (100 Hz) et non 2X de la vitesse de rotation (99,3 Hz).

How certain are you that the frequency is exactly 2X line (100 Hz) and not 2X of rotating speed (99.3 Hz).
MarkL

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If it vanished as soon as you cut the power I’d say you need to look at your Vfd.
Had a similar issue on a ABB powered Piller MVR Vacuum fan a few months back (similar powered motor) Motor had just been for a bearing change. ABB adjusted carrier Freq on the drive.....so I was told.... and the issue went away. I checked it a few times since and it’s ran fine.

That’s as much as I can add,
John from PA

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Quote:
Originally Posted by MarkL
If it vanished as soon as you cut the power I’d say you need to look at your Vfd.


Not sure I see anything to think this is a VFD and the motor speed of 2980 RPM seems reasonable for 50 Hz.
Noknroll

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Reply with quote  #6 
Bouramoh
If it is 100Hz the easiest thing to check is a running soft foot check, does the waveform show a beat?
bouramoh

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Reply with quote  #7 
Merci a vous tous je doit contrôler le pied mou premièrement
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John from PA

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Quote:
Originally Posted by bouramoh
Merci a vous tous je doit contrôler le pied mou premièrement


=== Thank you all I must control the soft foot first

Bon papier sur le diagnostic moteur à https://www.industry.usa.siemens.com/drives/us/en/electric-motor/anema-motors/specification/Documents/trouble-shooting-induction-motors.pdf

Malheureusement, c'est en anglais.

 
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