Our VFD is 3 phase 380VYou might say the input power is higher than the output power. If it's the other way round then we would ask what law of physics is involved..
Since electrical power is a function of voltage and currents, we can assume your input/output voltages are different; and since there is a large variety of VFD, both single phase and 3 phase, we would require a little more information to give a straight explanation.
1. Yes, amps on all 3 phases are sameghulamshoaib...
So then, there is no question about it being a True Rms ammeter?
1) Have you measured all 3 phases?
2) What is Input to Output ampere Ratio ?
3) Do phase currents differ?
4) Can you measure Input to Output power with a clamp-on power meter?
5) What is Amperes in percent of rated capacity?
6) Is VFD "Auto-Tuning" type?
If the motor is running above base speed/frequency (extended frequency range), there might be some explanation. (Drawings borrowed from Delta Automation website)Dear All,
Normally we see that on a VFD, input side amperes are less than output side amperes
but here in one case, input amps are more than output amps
can anyone tell me what may be the reason?
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by Gunner Scott