Re: [CAD_CAM_EDM_DRO] Motor Noise?

Hi Sven,

I doubt I can help you any further! Perhaps you can contact Siemens.
Looks like most of the RFI figures are for "radiating". "immunity to
interference's EN50082-2" might tell you more.

Alan KM6VV


"Sven Peter, TAD S.A." wrote:

>
> Hello Alan.
> I really thank you for the help on this project.
> Part off the answers on your questions you will find on the
> Site of SIEMENS for LOGO 230RCL
> I have following data in the manual:
> compensation of failures on tension 10 to 20 ms
> tension logical 0 <40V <0,03mA
> tension logical 1 >79V >0,08mA
> time delay for switching 0 to 1 or 1 to 0 typical 50ms
> electromagnetic compatibility CEM
> electrostatic discharge IEC 801-2 intensity grade 3
> 8kV in the air
> 6kV by contact
> electromagnetic field IEC 801-3 10V/m
> radio interference suppression EN 55011case limit B group B
> Emission of perturbances EN50081-2
> immunity to interference's EN50082-2
> rafaga (short term) impulses IEC 801-4 grade 3
> 2kV conductors and signals
> Individual surge impulses IEC 801-5 grade 2 500V power line
> safety indications CEI / VDE (lasts is Verein Deutscher Elektriker)
> dielectric rigidity fulfils IEC 1131
>
> I hope that tells you something. To me not much.
> I think about using shielded signal wires and ferrite beads on the power, input
> and output lines when I find appropriate ones. The PLC I want to
> fix outside the high frequency inductive centrifuge in a separate metal
> cage so that only the small incorporated LCD display is visible.
> the display is incorporated in the plastic box. and has no extra shielding.
> Beside that I thought of putting an additional surge protector on the power
> line.
> The machine its self does have a pretty big 4" by 4" by 3" RF-filter on the
> incoming lines to protect the power supply of the rest of the factory.
>
> These are the information I have at the moment.
> Thank you very much
> Sven Peter
>
> Alan Marconett KM6VV wrote:
>
> > Hi Sven,
> >
> > RELAY control would be mostly immune to EMI. I'd Examine:
> >
> > Does the PLC have an "engineered" enclosure DESIGNED for high EMI noise
> > environments? Are the control cables shielded and bypassed/filtered?
> > Is the power supply internal to the enclosure, with filtering on the
> > power leads? If the PLC has a keyboard/display, are these shielded?
> > These are some of the things I'd look for.
> >
> > Hope this helps!
> >
> > Alan KM6VV
> >
> > "Sven Peter, TAD S.A." wrote:
> > >
> > > Hello Allan,
> > > Am iI right that it is most probable that I would have trouble
> > > if I use a mini PLC and it will be safer to go with a relais control?
> > > Thank you very much for your patience.
> > > Sven Peter
> > >
> > > Alan Marconett KM6VV wrote:
> > >
> > > > Hi Sven,
> > > >
> > > > Good luck! Sounds like a pain to have to do 12 relays, and more solid
> > > > state relays. I'll bet you DON'T have to solder. Use crimp on terminal
> > > > lugs! Let us know how it comes out!
> > > >
> > > > Alan KM6VV
> >
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