Sinamics S120 Non-Metallic body showing some voltage

Dear Experts,

As I am working on a machine consist of some 11 (15kW, S120) drives, which are running in metallic dust environment.

While troubleshooting I got electrical shock at drive cabinet which is non-metallic.

I didn't understand how this is possible to get shock from non metallic cabinet ?

Is is static voltage ??

Power Earth have been properly connected & found ok.

If it is supply related issue please suggest how this problem will be resolved.

That would be static electricity.

Non-conductive surfaces do not conduct electricity.  To satisfy yourself, check resistance to ground.  It should be huge.

If it is static electricity then what would be voltage value ??

Here checking with meter it shows 43 Volts.

Regards,

M

43V?

You are getting induced voltage from somewhere and it's collecting on the surface.

That's scary.  You may want to look at putting screening inside the cabinet walls and grounding them.

Is it possible to have induced voltage in non-metallic body of drive ??

please refer attachment & suggest..

Non-metallic?  No.  However, it looks like you are covered with conductive dust.

Drive is going to fail soon when something arcs. 

Static electricity can give you 10kV..
but when discharged takes a while to get there again.

I just had to log in to see that picture.

THAT is not static electricity... its dangerous.
What was the reading again? AC / DC?

Jeff Casagrande

Non-metallic?  No.  However, it looks like you are covered with conductive dust.

Drive is going to fail soon when something arcs.

But it does seem like plastic....
the lighting is just to bad to tell.
coated?   not too sure.
Thorough cleaning (powered off!) might reveal if that is the case.

Building a capacitor?....
Very high voltage braking through the thin of the plastic?

That situation does need attention.
Please let us know the result.
w

The reading was taken in AC..

need some guidance to overcome the issue..

That's what I'm seeing.  Capacitor in the making with a conductive film. 

Drive goes poof soon.