Variable speed devices y continius chemical process indutries

[Anonymous]

My question is:

In the scenary where any pump are in service and reswitching take place, will the motor restart at the graduated rpm to maintain the same flow in the process. will it be possible

[jatin333]

you can perform this phenomena through VFD 

[Anonymous]

@jatin333 said:
you can perform this phenomena through VFD 

Hello Mr jatin3333

This reply is not complete for me due to reswitching involve more than 1.2 sec. of no volt on the busbar, reducing motor speed about 60%  and overcurrent. So the VSD may loos speed control over the related motors. please be more explicit for me to understan. Thaks a lot

[Smithy]

By ‘Reswitching” I suspect that you mean the loss of supply to the bus feeding the drive either due to grid failure of switching from one supply to another and your expectation is that the drive will ride through this event then re-establish speed/flow when the power is restored. This is possible and the principle is known as” kinetic buffering”.  It involves using the momentum stored in the driven system to keep the drive control alive whilst there is no incoming feed and reducing speed in a controlled manner to avoid overloads but its success depends on a number of variables including length of supply outage and inertia of the driven system.  First of all check that your VFD support “Kinetic buffering”, not all do, and that it is correctly programmed to make use of the feature

I hope that this answers your question but, if not, and you want concise answers you need to be specific in your question indicating the situation and your desired outcome so that people do not have to try to guess what you mean.

[Anonymous]

Thanks a lot Mr Jatin Now I am clear about this matter, the problem was tha I did not awared about the kinetic buffering support existence facilities in the VSD. I beg your pardon for not to be more explicit in my first question, I will take your advise well into account.

Best regards

Isdray

[Author]

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