The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by ghost307
Today at 04:10 PM
International Wire Colour Codes
by Tjia1981
Today at 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 7
renosteinke 6
ghost307 6
Potseal 4
Who's Online
0 registered (), 165 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#61030 - 01/14/06 03:58 PM Dynamic braking
grizzly Offline
Junior Member

Registered: 12/28/05
Posts: 1
Loc: 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?


Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#61031 - 01/14/06 04:22 PM Re: Dynamic braking
deverson Offline

Registered: 03/07/05
Posts: 20
Loc: 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

#61032 - 01/17/06 10:55 PM Re: Dynamic braking
Scott35 Offline

Broom Pusher and

Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA

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.

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#61033 - 01/18/06 12:27 AM Re: Dynamic braking
Alan Belson Offline

Registered: 03/23/05
Posts: 1801
Loc: Mayenne N. France
Grizzly, if you fit a brake to this saw, don't use a dado head on it.

Wood work but can't!


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals