Braking a motor not on a vfd - Page 2 - Electrician Talk - Professional Electrical Contractors Forum
CLICK HERE AND JOIN OUR COMMUNITY TODAY, IT'S FREE!
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Trade Topics > PLCs, VFDs, Motors and Controls


Like Tree10Likes
Reply
Thread Tools Display Modes
Unread 11-29-2019, 01:43 PM   #21
Senior Member
 
Going_Commando's Avatar
 
Join Date: Oct 2011
Location: New Hampshah
Posts: 6,081
Rewards Points: 1,534
Default

My old man found these, and the pricing is cheaper than a vfd/brake setup. https://www.ambitechbrakes.com/produ...view/g-series/. Anyone have experience with these?

460 Delta, that is a great idea. I'm gonna remember that for a crushing plant we do work for.

Paul, like I said, I haven't setup braking through a VFD before other than setting a ramp down speed (which I know isn't the same). I did some quick googling and saw automation direct had some braking modules tied for specific VFDs, so that's what I was going by. I don't claim to be an expert, which is why I reached out here for a situation I haven't run in to yet.
__________________
"I bet you smell like cigarettes and felonies." -HackWork
Going_Commando is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE


Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Advertisement
 
Unread 12-02-2019, 03:02 PM   #22
Senior Member
 
JRaef's Avatar
 
Join Date: Mar 2009
Location: SF Bay Area, California
Posts: 5,143
Rewards Points: 2,166
Default

Ambitech are DC injection brakes, they've been around a long time and are of decent quality, albeit a bit light on options that can come in handy. For a long time in the 80s and 90s they had the only UL listed DCIB unit on the market, so they sold a lot of them. I don't know where they stand now however, I haven't used one in a long long time.

As I had said in the other referenced thread, the big problem with DCIB in general is that of motor thermal stress. Every motor has a limted number of starts-per-hour it can handle, and when you add DCIB each start implies a stop where the thermal effects are the same as starting, so your starts-per-hour capability is not only cut in half, but the "minimum time between starts" is doubled. On a 10HP motor, the basic starts-per-hour is likely somewhere around 20 with evenly spaced rest times between them, so that's running every 90 seconds, with 90 second rest times. So if you add DCIB, that's 10 starts, with 3 minute rest times minimum. If your auger operators will not conform to those limits, you will be smoking motors rapidly.

You can get stand-alone Dynamic Braking modules (i.e. braking resistor), but they are expensive and as previously mentioned, buying a simple 10HP VFD with DB will likely cost you less.

You can't just hook up resistors to a contactor and expect that yo stop a standard AC induction motor. Whne the running contactor is opened, you are removing power from the windings. No power = no flux = no ability to generate energy to go into the resistor = no braking.
pudge565 and CMP like this.
__________________
"If you don't know where you're going, then any direction will do." -- Lewis Carroll

Last edited by JRaef; 12-02-2019 at 03:04 PM.
JRaef is online now   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:20 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com