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Anonymous Poster

earthing

03/15/2009 7:48 AM

Dear Member

i have a 110vac ups supply to my dcs and plc system.this is a floating supply and the voltage across phase and earth was 48 volts. after 3 months when I again measured as a part of preventive maintenance it was 3 volts. how this change can occur. will it affect the output current of the said ups.
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CJMcGill
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Join Date: Jul 2008
Location: SoCal USA
Posts: 556
Good Answers: 23
#1

Re: earthing

03/15/2009 7:42 PM

Your supply might not be floating any longer. If one leg has found an earth point, you will certainly know it when a second leg finds earth. CJM

__________________
 I do not 'know it all', but i will admit that I would like to. CJM
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dineshpandit80
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Join Date: Mar 2009
Location: delhi india
Posts: 79
Good Answers: 2
#2

Re: earthing

03/16/2009 4:42 AM

kindly check neutrel to earth voltage if it is more than 2 to3 volt then it may dangerous for your system in that case check your earth resistance and also check neutrel of your voltage it is a serious metter of electronics item serve from your UPS
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