ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
sec cable code conflict
by HotLine1. 11/20/18 03:08 PM
This anti-theist is priceless!!!
by Texas_Ranger. 11/17/18 02:15 PM
High current GFI vs regular GFCI
by Texas_Ranger. 11/17/18 02:07 PM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 34 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Dynamic braking #61030
01/14/06 06:58 PM
01/14/06 06:58 PM
G
grizzly  Offline OP
Junior Member
Joined: Dec 2005
Posts: 1
Sanford, NC
I have an old Greenlee table saw that is used to cut aluminum up to one inch, as well as plastic and wood. It operates on three phase, 230 vac and is an old direct drive type. The problem is that it takes a very long time for the saw to coast to a stop. I would like to know if anyone has ever installed a dynamic brake on something like this before?

Regards

Work Gear for Electricians and the Trades
Re: Dynamic braking #61031
01/14/06 07:22 PM
01/14/06 07:22 PM
D
deverson  Offline
Member
Joined: Mar 2005
Posts: 20
Mosinee, WI USA
We use a plugging contactor to stop coal shakers within 5 secs. Not the cheapest way as we have to change the contacts on the reverse contactor every 2 years at best. But they get used 500 times/ day, no BS.
We looked into softstart controllers but they didn't do what we wanted. Dynamic braking requires more room for all the associated equipment.
Hope this helps
Dave

Re: Dynamic braking #61032
01/18/06 01:55 AM
01/18/06 01:55 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Grizzly,

Here's a Schematic regarding Dynamic Braking of an AC Induction Motor, which may be of some assitance to you:

Dynamic Braking of AC Induction Motor

The Schematic shows a 3 phase Motor, just edit to include 2 motor Leads rather than 3 Leads.

Also, you will need to have this braking system interlocked with some type of starter. This would be best done within a conveniently sized external cabinet, that contains all needed equipment.

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Dynamic braking #61033
01/18/06 03:27 AM
01/18/06 03:27 AM
Alan Belson  Offline
Member
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
Grizzly, if you fit a brake to this saw, don't use a dado head on it.

Alan


Wood work but can't!

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 3,903
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
Popular Topics(Views)
251,641 Are you busy
188,776 Re: Forum
178,495 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.023s Queries: 14 (0.005s) Memory: 0.9601 MB (Peak: 1.0923 MB) Zlib enabled. Server Time: 2018-11-20 21:45:07 UTC