# GreenDriv

Member Since 05 Sep 2010
Offline Last Active Dec 01 2012 08:48 AM

### In Topic: Sensorless Vector Control In Vfd

16 February 2011 - 06:02 AM

vector control VFD performs better in the areas of precision control than V/F or scalar control VFD.

### In Topic: Variable Speed Drive Web Pages

10 February 2011 - 01:40 PM

QUOTE (marke @ May 10 2008, 11:57 AM) <{POST_SNAPBACK}>
AC Variable Frequency Drives A brief introduction to VFDs
Shunt DC Motors A brief introduction to Shunt DC Motors
Series DC Motors A brief introduction to Series DC Motors
Compound DC Motors A brief introduction to Compound DC Motors

http://en.wikipedia....frequency_drive The introduction to VFD on wikipedia is a good resource for some one.

### In Topic: Vfd Sizing

10 February 2011 - 01:37 PM

QUOTE (mbouknight @ Jul 21 2010, 03:11 AM) <{POST_SNAPBACK}>
How do I find the Full Load Amps for a 380 V motor, 3-phase, 200 HP, 1.15 service factor in order to correctly size a VFD?

I think you can refer to the name plate of the motor. When you want to apply the VFD, just remember that the power of VFD should be equal or larger than that of motor. That's enough.

### In Topic: Energy Conservation By Vfd Drive

05 September 2010 - 01:22 PM

QUOTE (Garat @ Nov 12 2008, 04:08 PM) <{POST_SNAPBACK}>
Dear Mr Suraj,

First you run the existing system as it is for a fixed amount of time.Note down the energy consumed.

Then fix the vfd in the system, and run the system for the same amount of time and note down the energy consumed. Difference between the energy consumptions is the energy saving.

I think just running VFD in the system for a time. Then compare the power consumed with the rated power of ac motor. Then you can know if the energy is saved.

Of course, it depends on the exact load information. For example, if the load is under full running, there is no energy saving, even will consume more power because you have used vfd. But if the load is not under full running, you can find the obvious energy saving.

Hope it helps.