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High Neutral To Earth Voltage


cooljiju

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Hi all,

 

I have commissioned new CNC machine at my factory, it was noticed the neutral and earth potential difference is high ( close to 50 V).intially we suspected the earthing, so we installed new chemical earthing, the earthing resistance measured value by the earthing ppl comes to 0.8-1 Ohm. The neutral leak was checked and all seems to be well. now we are in complete fix on how to find out the root cause of the problem.

 

Your expert comments will be really helpful

 

Thanks

 

regards

 

Jithesh.V

India

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Is the N-E voltage sinusoidal at your mains frequency, or is it a high frequency?

It is possibly a high frequency noise due to incorrectly installed VFDs.

 

Best regards,

Mark

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Is the N-E voltage sinusoidal at your mains frequency, or is it a high frequency?

It is possibly a high frequency noise due to incorrectly installed VFDs.

 

Best regards,

Mark

Hello Mark,

 

Thanks a lot for the reply. how do we check for the frequency as u mentioned? can u please elaborate on the subject.i can instruct the machine ppl to check the point u mentioned.right now we are checking the N-E voltage without starting the machine.

 

Additional Information.

1)we are checking for the N-E voltage @ voltage stabilizer Input.

2)The input 3 phase voltage between R-N,B-N,Y-N are 220 ,243 and 242 V respectively.

 

Thanks a lot again

Regards

Jithesh.V

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  • 6 months later...

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