CST VS VFD drive

Posted in: , on 18. Sep. 2012 - 09:34

We are designing a long distance troughed belt conveyor carrying coal @ 2200 TPH and Lift of 32M.As per our calculation,5 No drives,each of 750KW, will be required.

One of the questions that come to me is whether we should use VFD drive or CST drive with each motor.

My feeling is that both can provide gradual start/stop and hence dynamic effect due to faster start/stop can be minmised with both..However,VFD has one big advantage.In case rate of feed is low on a continuous basis,VFD provides me the facility of running the conveyor at lower speed and hence can save power.

In contrast,power loss in CST is less compared to VFD when running at 100% load.CST also takes lesser space.Also ramp up/down is mush smoother with CST.

Can any expert advise me whether my understanding is OK and what is his opinion about this. ■

Conveying
Transport
Belt Conveyors
Mechanical Conveying
Trough Belt Conveyors
Feed & Grains
Coal
Production of Solid Fuels
Solid Fuels & Energy Generation
Replies
Login to add a Reply

Re: Cst Vs Vfd Drive

Posted on 18. Sep. 2012 - 01:51

Need to evaluate against your criteria (which we do not know) and decide.

Are you confident of the rewards you obtain by running at reduced speed?

Do you have a mechanism to address for the different speed of the drives along the conveyor with CST - has this been included in your analysis?

This may be of interest:

https://forum.bulk-online.com/showth...ssion%29-Drive

Regards,

Lyle ■

Re: Cst Vs Vfd Drive

Posted on 19. Sep. 2012 - 08:48
Quote Originally Posted by Lyle BrownView Post
Need to evaluate against your criteria (which we do not know) and decide.

Are you confident of the rewards you obtain by running at reduced speed?

Do you have a mechanism to address for the different speed of the drives along the conveyor with CST - has this been included in your analysis?

This may be of interest:

https://forum.bulk-online.com/showth...ssion%29-Drive

Regards,

Lyle

Dear Lyle,

Thanks for your response.

Yes,We are confident that the power consumed becomes lower with reduced speed.Adding to this,the wear effect also reduces.

With CST,how can I vary the speed?My understanding is that this is basically a fixed speed drive.The clutch mechanism ensures controlled accelearation/deceleration.

Thanks. ■