VFD Article in May issue 351

[Robert Atkinson 2Participant @robertatkinson2]

OK lets call it UNSAFE Voltage. Anything over about 50V is considered unsafe A VFD with 240 VAC and > 300V DC on the teminals is UNSAFE.

A VFD will not meet BS EN IEC 60335-1 or similar without an enclosure and other parts.

Robert.

[EmgeeParticipant @emgee]

I believe BS EN IEC 60335-1 would only be applicable to a VFD in this instance if you class a lathe or milling machine as an “appliance”, surely they fall into the machine category.

Emgee

 

[Robert Atkinson 2Participant @robertatkinson2]

I said “or similar”. If the machine is being used in a domestic environment so these generic requirements are the minimum / simplest. You could of course apply BS ISO EN 60204-1 but it has even more requirements.

Robert.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi. just been looking at SD1series IMO which seems to address some of the comments that Robert has made. Please correct me if I’ve got it wrong.

Regards Nick.

[Nicholas Farr]

On Nicholas Farr Said:

Hi. just been looking at SD1series IMO which seems to address some of the comments that Robert has made. Please correct me if I’ve got it wrong.

Regards Nick.

Er, what in the datasheet addresses Robert’s issues?  Not obvious to me.  On the face of it, the VFD looks like a typical “needs to be a box” component.

Dave

 

[Nicholas FarrParticipant @nicholasfarr14254]

Hi SOD, have you read the section at the bottom of the first page in Other.

Regards Nick.

[Robert Atkinson 2Participant @robertatkinson2]

The “Other” section clearly says the inverter needs to be in a metallic enclosure to at least IP 20 with IP3x top surface. It also states the they need an external EMC filter.

Did you read as far as “wall mounted” and stop? This means mounting on a flat surface as opposed to a DIN rail or similar. It does not mean you can just screw it to the workshop wall.

Robert.

[EmgeeParticipant @emgee]

Clearly not concerned about dust or small pieces of swarf entering the VFD case.

Emgee

[Robert Atkinson 2Participant @robertatkinson2]

The IP ratings are a minimum. If you were putting the enclosure where it was exposed to dust, swarf or liquids you would have to to use a higher rated enclosure.

IP20 + IP3x on top is basic protection against fingers being poked in and small items falling in.

Robert.

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