thank you.
I forgot to tell you also, the meter used is a true rms meter (flux)
So, there are some conditions should be respected to mesure the amp in the input?
Also, the voltage used in our calculation come from the namplate motor ?
KW= (volts(avg) x amps(avg) x power factor x 1.732)...
Hi,
Thank you for all.
Dear itsmoked and all, when you told me:" The problem is that there are NO sinusoids anywhere near a VFD. Your meters are lying to you".
anywhere means also in the input?, because my engineer tell me now it is thrue but only in the output.
He dont believe in the input...
Hi All friends,
Thank you for your great support,
So if I understand, It is better to install a kw hour meter analog and no digital in the panel for each vfd.
With this installation, we get proprely the information about the consumption and accurately.
thank you friend.
maxximo
Thank you very much also,
How I can convince my engineer because I am not a engineer but with my job and my position, I understand how work a VFD and I have aquired some knowledge.
But when I talk with my engineer, he learned this formula and this calculation method to know the consumption or...
thank you very much!
but we dont use inside the vfd a kilowatt hour meter.
Other thing, the meter used to grab the amperage and the voltage is perfectly calibrated and certified (brand flux, power logger 3 phases).
But my question is how and why we get a big saving with the calculation . it is...
Dear All,
I use a volt meter to get the actual input amperage on my VFD.
And all time, after calculation I get the saving energy value like the saving by theory or more higher.
How is it possible?
Someone have a great experience and can explain me how and why there are a difference between...
Thank you for your answer,
Why?
I want use a VFD because if you check this company www.astorlabs.com
They provide a smart vfd with a harmonic supression system included in the panel.
So, they explain me for example in the Grand hyatt in Beigijng, they installed 4 vfd for 4 condensers...
Dear Friends,
I wish control a condenser pump by a VFD, because the motor is oversized. 250 kw for the motor and 230 kw for the pump.
Also, we dont use the sensor there to maintain a constant flow and the valve is controlled manually.
Some engineers proposed me to program the VFD with a...
