A dust collector blower fan motor 18kW, previously run by a star-delta starter, has been replaced with a VFD( Brand: LS, Model: SV-iP5A). Our intention was to save energy by lowering the Frequency SP. The VFD has been set to V/F control mode.
But since the installation of VFD, the vacuum pressure dropped significantly even at 50Hz(Line Frequency). 18kW motor is taking current of about 34A. I could further increase the frequency which would increase Amps eventually motor might get damaged.
One thing I have noticed that the output voltage of VFD is only 360V at 50Hz although my line voltage is 415V.
Some related parameters that I have set are as follows:
FU1-40 V/F Pattern: Linear
FU1-50 Rated Voltage: 415
FU1-31 Base Frequency: 50
FU2-60 Control Mode: V/F
FU1-49 Input Voltage Adjustment: 86%
The last parameter stated above (FU1-49), I don’t know it function. I have tried increasing and decreasing between 73-115%. No improvement on output voltage or suction pressure.
As per my knowledge, blowers, pumps etc. load directly square proportional of its angular velocity/freq.
Why I am getting less suction pressure than previous even at 50Hz?
Why the output voltage is less? Is voltage responsible for less pressure?
Please guide me on this.
Thanks
But since the installation of VFD, the vacuum pressure dropped significantly even at 50Hz(Line Frequency). 18kW motor is taking current of about 34A. I could further increase the frequency which would increase Amps eventually motor might get damaged.
One thing I have noticed that the output voltage of VFD is only 360V at 50Hz although my line voltage is 415V.
Some related parameters that I have set are as follows:
FU1-40 V/F Pattern: Linear
FU1-50 Rated Voltage: 415
FU1-31 Base Frequency: 50
FU2-60 Control Mode: V/F
FU1-49 Input Voltage Adjustment: 86%
The last parameter stated above (FU1-49), I don’t know it function. I have tried increasing and decreasing between 73-115%. No improvement on output voltage or suction pressure.
As per my knowledge, blowers, pumps etc. load directly square proportional of its angular velocity/freq.
Why I am getting less suction pressure than previous even at 50Hz?
Why the output voltage is less? Is voltage responsible for less pressure?
Please guide me on this.
Thanks