sir.. now i m using a 10HP 1500 RPM 3 phase AC induction motor as a primemover for my pump which is operating 50 bar pressure (constant) ...

i like 2 change flow rate of pump by adjusting the frequency or voltage of input supply to the motor...

suggest me ur best opinion to select the VFD drive to my motor.....

 

10HP approximately = 7.5kW. See the motor plate for its rated current.

VFD must be able to handle power and current.

For this power, the VFD will have 3-phase input (probably 400V).

What is the pressure when the motor is started? The motor will need to be unloaded at start.

 

sir. that motor rating is 15HP (not a 10 HP) and name plate current is 50A..
frequency is 50Hz. three phase induction motor...

my requirement is want to change flow rate at constant pressure....

in starting condition motor may be unloaded.....

 

I've picked up very expensive VFDs from eBay at remarkable savings and never regretted it, the size you're needing is going to be necessary but expensive.

HOWEVER - before you spend a dime you better make sure your pump motor is "inverter rated" meaning it will safely operate off of a VFD. Inverter rated motors have higher insulation ratings than regular motors do.

 

Sadly the link is at work but I've got a nice one about what happens when you change the power input and speed to different types of pumps. Some sort of fancy termnology about this and I can't remember it for the life of me.

There's some background info here:
http://www.danfoss.com/NR/rdonlyres/8C303CB7-23A2-4B8B-AA92-1EFE1F83F927/0/waterintrolesson.pdf

 

Your VFD should have 3-phase 400V input.

Wow, first message and you both did a necropost and a spam!