Previous in Forum: OISD Requirement for Providing Welding Receptacles at Plant Equi. Manhole??   Next in Forum: Relay Settings
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
Rate Comments: Nested
rakeshmishra55
Participant

Join Date: Nov 2011
Posts: 1

Astat

11/12/2011 5:02 AM

I've some problem regarding the hoist motion that when sometime there is freefall from hoist, but the brake and tachometer is ok.
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: astat

11/12/2011 9:57 AM

In your title you have the word "astat" which is a trade name for a solid state soft starter from GE. Is that what you have? If so, totally inappropriate for a hoist. The reduced torque will allow free fall, the reduced voltage messes with the brake

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply
Anonymous Poster #1
#2
In reply to #1

Re: astat

11/12/2011 1:21 PM

hi.. guru

astat is the cycloconverter product of ABB, it used for hoist motion.there is freefall that happens once or twice a week.i checked everything but unable to find the problem
Register to Reply Off Topic (Score 5)
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#3

Re: Astat

11/12/2011 3:23 PM

I presume you mean this. Does their technical manual trouble shooting section mention load creep or other problem movements?

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#4

Re: Astat

11/14/2011 8:04 AM

If a hoist (lifting equipment) is behaving in freefall then there is a fault. Do not use it until the fault has been rectified and the repairs inspected as satisfactory by the Engineer/Surveyor for the company that is supplying lifting equipment failure indemnity insurance cover at the facility.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
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
#5

Re: Astat

11/14/2011 2:01 PM

This is why I was confused. Seems someone in one of those companies failed to investigate the trade name thoroughly!

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply
Register to Reply
Have a Different Question?
5 comments
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); JRaef (2); PWSlack (1); Tornado (1)

Previous in Forum: OISD Requirement for Providing Welding Receptacles at Plant Equi. Manhole??   Next in Forum: Relay Settings

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 (43 right now)
Show Members
Advertisement