Poor Power Factor

[Abdullah.W]

Hi Fellows,

I have a VSD with PIHF (harmonic filter) to operate the conveyor, as soon as it runs the instantaneous power factor falls to 0.3 - 0.4, which is pretty poor. I am getting 5V on the neutral as well. Earthing appears to fine. Could any one assist with the trouble shooting?

 

[Gr8blu]

A couple of questions to be sure we understand what you're asking:
1) Is the filter acting on the drive output (between drive and motor, for example) or on the drive input (between drive and utility, for example)?
2) How much load (current) is being applied - both in actual amperes and in per unit?
3) Provide a sketch of how the drive and motor are grounded - as well as whether there is something else connected to the bus powering the drive.

 

[waross]

Are you measuring the PF on the VFD input or output?

 

[Jpascp]

As per ETAP simulations is possible to improve PF with VFD.