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Anonymous Poster

Earthing

11/22/2007 6:20 AM

In my industry, we have used common earhing for PLC and Load Cell and others , Last time we suffer from the effect of lightening, at that time the PLC and Load Cell etc get damaged I want to give seperate earthing for PLC Is is possible, If yes then tell me the possible way.

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Power-User
United States - Member - USA Engineering Fields - Control Engineering - Never enough money

Join Date: Feb 2007
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#1

Re: Earthing

11/22/2007 11:21 AM

Drive new copper grounding stakes into the ground and run copper wire to the grounding terminal on the PLC. That's basicaly it. Now you may need to give consideration to how you will route the new grounding wire and have the new grounding stakes certified but any electrican can figure this out, you just need to spend the money.

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Power-User

Join Date: Oct 2006
Location: Indonesia
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#2

Re: Earthing

11/23/2007 1:17 AM

Sir,

Earthing of Medium Voltage Station, Lightning, Low Voltage station, Instrumentation/Automation/Electronic, must be all separated. Load cell and PLC can be one stake/rod, all LV system can be joined to one system of earthing.

Have to contraint in the definition of system because each system level have their own specific hazard different from others.

MV station commonly use mesh grounding system with total value around 1ohm(some say 3ohm), while for electronics should have 0.xxohm.

Lightning, you must have the external and internal surge arrester.

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Power-User

Join Date: Dec 2006
Location: Vietnam
Posts: 153
#3

Re: Earthing

11/23/2007 3:53 AM

You have to buil a lightening system that is seperated from your earthing system.

Because of they are two different systems with different purposes.

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Guru
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#4
In reply to #3

Re: Earthing

11/23/2007 5:28 AM

NAM70,

you were the first person with a brain in this Blog! Well done, the rest missed it completely....

I wonder if your tip was fully understood or not!!!! We will see......

Have a great day!!

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Power-User

Join Date: Dec 2006
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#7
In reply to #4

Re: Earthing

11/26/2007 12:35 AM

Dear Andy Germany,

thanks for your care.

The same 2 u.

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Power-User

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#8
In reply to #4

Re: Earthing

11/26/2007 12:48 AM

Dear Andy,

Thanks for your concern!!!.

Have a nice day!

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Guru
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#9
In reply to #8

Re: Earthing

11/26/2007 3:08 AM

All the others have gone REAL quiet, I think that "the penny has dropped" as we say in the UK!!! Thanks to you!

Have a great day.

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Participant

Join Date: Nov 2007
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#5

Re: Earthing

11/23/2007 7:19 AM

It is not a good practice to install separate earthing for PLC's. I recommend you to follow the IEEE Std. 1050-1996 "IEEE Guide for Instrumentation and Control Equipment Grounding in Generating Stations (ANSI)".

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Associate

Join Date: Nov 2007
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#6

Re: Earthing

11/25/2007 4:52 AM

Hi.all

Whats the earth rod omh rating requirement for Lightning Rod arrestor ? How about for equipment(chiller, compressor, etc) eathing rod rating? Any guideline? Thanks.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#12
In reply to #6

Re: Earthing

07/07/2021 3:38 AM

Loads of them. British Standard 7671 is among them, for example. Simply select the electrical code applicable to the country of installation.

If in doubt, consult a qualified local Electrician.

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#10

Re: Earthing

11/26/2007 7:18 AM

to protect from lightening you have to use lightening protection system.Ingesco from spain is one company.you can follow lightening protection as per british standards for which furse is the manufacturer.to protect electrical system use surge suppressor of emerson in the main LV panel.the rating has to be designed.

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Guru
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#11

Re: Earthing

11/28/2007 2:18 AM

you should construct separate earth pit and earthing for your PLC and should be checked periodically to avoid such failures. The general earthing may not be always free of charge as there may be some neutral shift voltage due to unbalanced load and will discharge to earth if it is neutral earth system .Surge voltage may cause voltage in earthing system and will cause damage to PLC if connected with general earthing system. The normal procedure is to provide separate earthing for LP system, electrical earthing and static earthing .All computer controlled machines should be provided with independent earthing.

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#13

Re: Earthing

07/13/2021 12:32 PM

You need to do a separately earth system, one for power equipment and other for PLC and sensitives equipment like electronic, all conneted at difernt earth pits

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Users who posted comments:

Abu Khansa (1); Andy Germany (2); nam70 (3); PETRONIO (1); PWSlack (1); ratnagiriramkumar (1); Richard L (1); SStoessel (1); V.I.Abraham (1); waterlucky (1)

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