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manirul
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Join Date: Oct 2007
Location: Pune, India
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VFD Drive Abnormality

01/20/2011 4:37 AM

A 11 Kw drive having no I/C and O/G choke. At full load, measured current before drive and after drive are 2A and 30A respectively, drive feeder is the outgoing feeder of a PMCC, incommer of this PMCC having capacitor bank for PF correction, is this abnormality because of capacitor bank or having no choke, please discussed the matter.

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Anonymous Poster
#1

Re: VFD drive abnormality

01/20/2011 6:39 AM

what is the abnormality?
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
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#2

Re: VFD drive abnormality

01/20/2011 7:35 AM

Please confirm if you are measuring currents at both I/C & O/G side of the VFD with a True RMS Ammeter. Measurement by conventional ammeters would be erratic, particularly at the O/G side of the VFD.
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SHABU
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Join Date: Jan 2011
Location: mumbai
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#5
In reply to #2

Re: VFD drive abnormality

01/21/2011 7:16 AM

IT IS CORRECT
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#3

Re: VFD Drive Abnormality

01/21/2011 12:50 AM

2A in and 30A out does seem abnormal; I wish I had a drive like that....

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rudy.leurs
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Join Date: May 2007
Location: Flanders (Belgium)
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#4

Re: VFD Drive Abnormality

01/21/2011 4:54 AM

Is there a common DC bus that is used as supply ?
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