Previous in Forum: Tanzania Wiring Standards   Next in Forum: Freq Drives Dying Prematurely
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
5 comments
Rating: Comments: Nested
enkays
Active Contributor

Join Date: Oct 2010
Posts: 21

Star Delta Motor Running Trouble

11/12/2010 1:14 PM

The 37 KW motor starts in star and converts to delta, the contactor (delta closes). But, the motor does not run (the delta and main contactor is not tripping though). We have checked the running individually by starting in star and directly starting in delta. it runs that time. but in normal star/delta fashion the motor trips in delta change over. what could be the reason?
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
JRaef
Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#1

Re: star delta motor running trouble

11/12/2010 1:32 PM

MOTORS don't "trip", contactors don't trip either, but protective devices FOR the motor might trip. So what exactly is tripping?

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply
Anonymous Poster
#2

Re: Star Delta Motor Running Trouble

11/13/2010 11:07 PM

check the star/delta timer then somewhat adjust the timing of that timer.
Register to Reply
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#3

Re: Star Delta Motor Running Trouble

11/15/2010 9:20 AM

Wrong Power Cable Connections
Register to Reply
hithuanand
Power-User
India - Member - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Apr 2010
Location: Asia/India
Posts: 365
Good Answers: 1
#4

Re: Star Delta Motor Running Trouble

11/18/2010 8:26 PM

I hope the motor is a squirrel cage IM.You might have observed the motor runs little slow when it is in delta and works fine in star.please check the connection of delta is done properly(both starter and links outside the motor).If the problem persist its because entire motor winding may be wrongly winded.I hope back-off fuse setting is correct.
Register to Reply
Anonymous Poster
#5

Re: Star Delta Motor Running Trouble

11/20/2010 10:04 PM

connection may be wrong.
Register to Reply
Register to Reply
Have a Different Question?
5 comments
Copy to Clipboard

Users who posted comments:

Anonymous Poster (2); electricalexpert65 (1); hithuanand (1); JRaef (1)

Previous in Forum: Tanzania Wiring Standards   Next in Forum: Freq Drives Dying Prematurely

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (36 right now)
Show Members
Advertisement