Subject: Re: [eman] requirement on nominal voltage

From: "John Parello (jparello)" <[email-masked]>
Date: Fri, 8 Mar 2013 18:03:46 +0000

Hi Juergen,

Looking at this again as I got some feedback during the modeling.

Could you clarify why the nominal voltage is attributed to a power interface in the requirements. Clearly the nominal voltage is a range for a device. If we look at other spec (201p) this is described in the Nameplate class.

The nameplate models what the device/entity is capable of while the characteristics  model what the device/entity is actually  doing.

So I think having a Nameplate nominal voltage range is a good requirement but I'm not clear on why it listed per power interface and not for the Entity.

I would think the actual voltage per interface (with some accuracy) would suffice?
Any examples?

Perhaps just have the requirements state nominal voltage range should be required but leave the modeling to the framework?

Thanks
Jp

-----Original Message-----
From: John Parello (jparello) 
Sent: Tuesday, February 19, 2013 9:44 AM
To: 'Juergen Quittek'; [email-masked]; [email-masked]; Nevil Brownlee
Subject: RE: requirement on nominal voltage

+1

-----Original Message-----
From: Juergen Quittek [mailto:[email-masked]] 
Sent: Tuesday, February 19, 2013 8:01 AM
To: [email-masked]; [email-masked]; Nevil Brownlee
Subject: requirement on nominal voltage

Dear all,

At the IESG review of the eman requirements we received the comment that our concept of nominal voltage might be to narrow:

5.2.7.  Nominal Voltage

   The standard must provide means for reporting the nominal voltage for
   each Power Interface.

The comment pointed to the fact that nominal voltage (or nameplate
voltage) is very often not a single number, but rather a range or even multiple ranges, for example, (100V-120V), (100V-240V), (100V-120V,220V-240V).

For making this clear it might be useful to make the following three modifications:
  - rename req. 5.2.7 from "Nominal Voltage" to "Nominal Voltage Range"
  - also replace "nominal voltage" with "nominal voltage range" in
    the text of req. 5.2.7
  - and add a sentence to the last paragraph of section 5.2:

OLD
   Static properties of each Power Interface are required information
   for Energy Management.  Static properties include the kind of
   electric current (AC or DC), the nominal voltage, the nominal AC
   frequency, and the number of AC phases.
NEW
   Static properties of each Power Interface are required information
   for Energy Management.  Static properties include the kind of
   electric current (AC or DC), the nominal voltage, the nominal AC
   frequency, and the number of AC phases. Note that often the nominal

   voltage is not a single value but a voltage range, such as, for

   example, (100V-120V), (100V-240V), (100V-120V,220V-240V).

What do you think?

    Juergen