Industrial Harmonics

some of the tips for prvent ur machines from harmonic are

1. no power cable is run on parallel with communication cable.

2. Ur drives/adi/dio damaged due to non use of ups, try to use proper ups system for its controlling of power supply

3. earthing must be seprater for ur panel (plc), only of copper with <=0.2 ohm resistance

4. all profibus must be well tight & proper dressing

tell me which plc u r using & for what purpose, so that i can guide u properly

surinder (maintenancegn@sperryplastlimited.net)

It is not clear are you using PLC or embedded boards? And is really your electronic components damaged? If it goes so. I suppose you have not optical or electromagnetic isolated inputs/outputs. It would be preferable to change your modules with isolated I/O.

Yes properly done shielding may help but nobody can get guarantee. I have used chain of Z-diods paralleled to analogue input to protect circuit. As well if you use voltage mode of analogue measuring you should change one to current (4-20ma).

If you have access to programming your PLC (PC?) you can use noise proof technique. For example getting used two data set strings instead one. If sets coincide it passed for further processing if not its should be disregarding.

What is a brand of PLC and/or modules you deal with? More information., please.

Best regards.

Hi! If it's actual yet. You may alter power supply feed point. In any case it is recommended to use high frequency power-supply filters and make additional shielding for sensitivity parts of system.

1)WE SHOULD USE UPS POWER FOR ELECTRONICS TO SAFE GUARD PLC/COMPUTER.

2)AFTER DOING NECESSARY ANALYSIS OF HARMONICS SUITABLE FILTERING CIRCUIT

SHOULD BE IMPLIMENTED TO IMPROVE POWER QUALITY.

HARMONICS CAN DAMAGE ANY ELECTRONICS/ELECTRICAL EQUIPMENT ANY TIME.

Dear friend, I am living with lot of harmonics. Normally AIO / DIO / COMPUTER MODULES got some power supplies that should have built-in in put filters. Check for their presence. I have found in many computer that PC SMPS do not have any filters. Ensure that your PC SMPS is of good make and got in put filters. Most important is earthig. Have separate earthing for your instrumentation and equipment. That should be different from Mains power electrical earthing. All shield cables must "shield should earthed at one end only.

Hope this will solve/ minimise your problems.