Bakia Posted July 27, 2006 Report Share Posted July 27, 2006 Motors supplied are for star/delta starting however the starter I have is DOL type. Will there be any problem if I connect this motor(delta connection only and ignore the star connection) to the DOL starter. Link to comment Share on other sites More sharing options...
jraef Posted July 27, 2006 Report Share Posted July 27, 2006 No, not a problem from the standpoint of the motor. Just do as you said, connect to the motor in the Delta pattern only. Power system capacity and torque issues related to the power train components and load are a different story, but you didn't post enough information to assess this any further. If those are issues for you, a Solid State Soft Starter is a better choice than Start-Delta anyway, and it would connect to the motor in exactly the same was as DOL. "He's not dead, he's just pinin' for the fjords!" Link to comment Share on other sites More sharing options...
marke Posted July 27, 2006 Report Share Posted July 27, 2006 Hello Bakia Welcome to the forum Technically, there are no problems connecting the motor in Delta and using the DOL starter, but there are consequences that do need to be considered. The strt current will be very high, typically in the region of 600 - 800% of the rated current of the motor. In some installations, that is not a problem, but in others it can be a major issue causing voltage drop and voltage fluctuation problems, and in some regions, there are requirements limiting the amount of starting current you can draw. Another issue is the start torque magnitude. This can cause mechanical issues depending on the driven load. So, the questions that I would ask are: Are you alowed to DOL start that motor? Is the supply strong enough to DOL start that motor with out voltage disturbance issues? Is the machine robust enough to withstand the DOL start torque? Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
mariomaggi Posted July 28, 2006 Report Share Posted July 28, 2006 Dear Bakia, rarely there is the need to start a motor without his load. Therefore you must consider all the typical needs of your load (inertia, friction, effective load, peaks of requested torque). Starting DOL a small motor unloaded on a strong line is possible, starting DOL a big motor with high friction and high inertia is impossible. If you need a reply for a specific application, please add more data. Regards Mario Mario Maggi - Italy - http://www.evlist.it - https://www.axu.it Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now