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dhanesh.koshti
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Join Date: May 2009
Location: Mumbai
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Hi Frequency VFD output power measuremet

10/10/2009 4:19 PM

Dear Sir,

We are having installation of 200KW siemens make VFDs for spinning machines

The output of this VFD is fixed at 133 Hz,415V

I am in search of a instrumet which can measure & record the KW/KVA/KVAR/Amp/Voltage at this 133 Hz PWM output.

Pl. help me.

Thanks

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wareagle
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#1

Re: Hi Frequency VFD output power measuremet

10/10/2009 7:25 PM

You need something like this http://www.tequipment.net/InstekGWM039.html

Google KVA and watt meters
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wareagle
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#2

Re: Hi Frequency VFD output power measuremet

10/10/2009 7:31 PM

Try this http://www.tequipment.net/InstekGWM039.html
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marcot
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#3

Re: Hi Frequency VFD output power measuremet

10/11/2009 11:48 AM

It might be easier to measure the inlet power and subtract a few percent for the drive losses.

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dhanesh.koshti
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#4
In reply to #3

Re: Hi Frequency VFD output power measuremet

10/11/2009 1:48 PM

presently I am already doing so.

but variable losses are proportional to load. and my load (spg. machine) having variable charactristics. Thus I can not follow this method.

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marcot
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#7
In reply to #4

Re: Hi Frequency VFD output power measuremet

10/12/2009 9:20 PM

Don't you have an analog output from the drive giving you the motor power or current?

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bioramani
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#5

Re: Hi Frequency VFD output power measuremet

10/12/2009 1:44 AM

http://www.mecoinst.com/catalog/details.asp?product_id=63

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MalcolmK
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#6

Re: Hi Frequency VFD output power measuremet

10/12/2009 4:30 AM

I have used a Fluke 43 which is also good for supply side - some instruments don't have high enough frequency response in my experience.

http://www.fluke.com/virtualmeters/fluke43/43demo.asp?AGID=&SID=

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JRaef
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#8

Re: Hi Frequency VFD output power measuremet

10/12/2009 10:51 PM

Only the most expensive of scopes can capture, extrapolate and calculate the extremely complex output waveforms of a VFD, expecially at 133Hz output. As mentioned above, your best bet is to use the VFD's readings through either an analog output or via serial communications. If you have a Micromaster or Sinamics drive, it will have all of those values available to you.

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Johny451
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#9

Re: Hi Frequency VFD output power measuremet

10/12/2009 11:29 PM

Easiest way is to use the built-in measurement capability of the VFD and route that to an analog output on the VFD.

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bioramani (1); dhanesh.koshti (1); Johny451 (1); JRaef (1); MalcolmK (1); marcot (2); wareagle (2)

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