Previous in Forum: How DC Motors Affect To Power Factor?   Next in Forum: Circuits on Higher Voltage
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
3 comments
Rate Comments: Nested
e.rose
Member

Join Date: Mar 2011
Posts: 5

Frequency Convertor Over Current

06/05/2011 6:27 AM

hi

we are going to minstall Frequency Convertor(fc) on some magnetic seperators with 22kw 3 ph 380v 50hz motors,we installed fc in mcc room after start command fc stopped with over current.we changed the parameteres to higher current and...,but fc didnot start.motor capacitor was disconnected and didnot start.we doubled cable size and it didnot start.we replaced fc by a bigger one and didnot start. after moving fc from mcc room to site near motor it started with no problem.motor is 150m far from mcc.what can be the reason of this.

tnx to all
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
LAA_Lucke
Guru

Join Date: Feb 2010
Posts: 1013
Good Answers: 36
#1

Re: Frequency Convertor Over Current

06/06/2011 7:10 AM

The distance! The cables from fc to motor will need to be properly sized and screened for such a distance: Critical ... Standing waves ... read the fc guide to installation and there should be guidance for such long cablings!
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
marcot
Guru
Canada - Member - Specialized in power electronics

Join Date: Feb 2008
Location: Montreal, Canada.
Posts: 1372
Good Answers: 80
#2

Re: Frequency Convertor Over Current

06/06/2011 11:01 AM

"but fc didnot start.motor capacitor was disconnected"

If this capacitor was at the motor, you probably destroyed the drive.

Never use a capacitor at the output of a drive.

__________________
 Experienced is earned, common sense is taught, both are rare essentials of life.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
e.rose
Member

Join Date: Mar 2011
Posts: 5
#3

Re: Frequency Convertor Over Current

06/25/2011 3:30 AM

by adding a inductor at output of fc problem wassolved .we were lucky ,our fc wasnot destroyed of using capacitor at it's output

tnx to all
Register to Reply
Register to Reply
Have a Different Question?
3 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

e.rose (1); LAA_Lucke (1); marcot (1)

Previous in Forum: How DC Motors Affect To Power Factor?   Next in Forum: Circuits on Higher Voltage

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 (92 right now)
Show Members
Advertisement