rons
Diamond
- Joined
- Mar 5, 2009
- Location
- California, USA
It's popular to change frequency to mask noise. How about performance when the drive/motor are already de-rated.
Example:
7.5 Hp motor powered by VFD on single phase. Motor requires 23 A on name plate. The de-rate factor is going to ask the VFD for 23 x 1.73 = 39.7 A.
If the VFD switching frequency range is 2,3,4,5,6,7,8,9,10 Khz, what would be a optimum number. In the sense to increase any performance factor up.
The factory default is 4 KHz.
Example:
7.5 Hp motor powered by VFD on single phase. Motor requires 23 A on name plate. The de-rate factor is going to ask the VFD for 23 x 1.73 = 39.7 A.
If the VFD switching frequency range is 2,3,4,5,6,7,8,9,10 Khz, what would be a optimum number. In the sense to increase any performance factor up.
The factory default is 4 KHz.