Buck Boost transformer - 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 Forum > General Electrical Discussion


Like Tree3Likes
  • 2 Post By frenchelectrican
  • 1 Post By brian john
Reply
 
Thread Tools Display Modes
Old 08-21-2018, 04:11 PM   #1
Junior Member
 
Join Date: Aug 2018
Location: New England
Posts: 3
Rewards Points: 6
Default Buck Boost transformer

New to this forum, been retired and out of the tool pouch for several years.
Back in the day, we would use a buck boost transformer, wired for 220v input, and get 120v out. We would use this when we were working in Europe to get 120v out of their 220v system, although the tools would run a little slow due to the 50 hz rather than our 60hz.
If memory serves, we used something similar to a 120/240 input, 12/24v output buck boost. The wiring diagram is what is missing. Do I wire the 220 to the input, and the 120 to the 120 input taps, and just isolate and cap the 12/24 leads?
Thanks in advance for your help!
RedneckRodshop 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
 
Old 08-21-2018, 04:47 PM   #2
Modérateur
 
frenchelectrican's Avatar
 
Join Date: Mar 2007
Location: Philippines
Posts: 8,635
Rewards Points: 21,782
Default

Quote:
Originally Posted by RedneckRodshop View Post
New to this forum, been retired and out of the tool pouch for several years.
Back in the day, we would use a buck boost transformer, wired for 220v input, and get 120v out. We would use this when we were working in Europe to get 120v out of their 220v system, although the tools would run a little slow due to the 50 hz rather than our 60hz.
If memory serves, we used something similar to a 120/240 input, 12/24v output buck boost. The wiring diagram is what is missing. Do I wire the 220 to the input, and the 120 to the 120 input taps, and just isolate and cap the 12/24 leads?
Thanks in advance for your help!
Just stop right there and get a electrician to help you on this one if you need the buck/boost transformer.

there is too many different way to do this. ( there is about 10 different way of connections afaik depending on the model of buck/boost transformer. )

and please fill your profile to help us give you a correct way to deal with it.
John Valdes and Bird dog like this.
__________________
Bleu est beau.
frenchelectrican is offline   Reply With Quote
Old 08-21-2018, 04:59 PM   #3
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,974
Rewards Points: 1,720
Default

Generally, Buck-Boost are for small voltage changes 12/24/32 volts up or down when you go from 120 to 240/277/480 the amount of steel and wire utilized to make a large change transformer as a buck-boost is not cost effective.

Google Hevi Duty Transformers for the countless wiring diagrams.
frenchelectrican likes this.
__________________
Ah, but I was so much older then, I'm younger than that now

Last edited by brian john; 08-21-2018 at 05:01 PM.
brian john is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-21-2018, 07:27 PM   #4
Junior Member
 
Join Date: Aug 2018
Location: New England
Posts: 3
Rewards Points: 6
Default

I have used a three phase motor as phase generator, wired from a single phase supply, to generate the third phase for another three phase motor. I assumed that I could use both sets of transformer input lugs, and the 220v lugs would cause 120v to be present on their respective terminals. Not sure what to do with the 12/24 leads though. And please do not insult me by saying it can't be done, as I have done it on numerous occasions, but for the life of me cannot remember the wiring sequence.
RedneckRodshop is offline   Reply With Quote
Old 08-21-2018, 08:19 PM   #5
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,974
Rewards Points: 1,720
Default

Quote:
Originally Posted by RedneckRodshop View Post
I have used a three phase motor as phase generator, wired from a single phase supply, to generate the third phase for another three phase motor. I assumed that I could use both sets of transformer input lugs, and the 220v lugs would cause 120v to be present on their respective terminals. Not sure what to do with the 12/24 leads though. And please do not insult me by saying it can't be done, as I have done it on numerous occasions, but for the life of me cannot remember the wiring sequence.
What voltage do you have available and what voltage do you want?

To get 220 VAC from 120 VAC a Buck-Boost is not available on the marker, and bother telling me what you have done or not done, because I could care less.

I am telling you what is available off the shelf.

You are not even sure what to do with the 12/24 volt leads and those are what are give you the boost or buck.

Now if you boosted 120 to 134 with a single buck-boost then boosted that again to
158 boosted that again to 182 then again to 206 than one last time to23.

You have it.

Google buck-boost and see what is available, see how they work, see why in a practical sense boosting 120 to 220 is NOT PRACTICAL with a buck-boost.

As for the motor trick that is an old method woodworkers have used for years that will work if you can get the motor running but is very inefficient.
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Old 08-21-2018, 10:02 PM   #6
Senior Member
 
Join Date: May 2015
Location: Sacramento, California
Posts: 14,053
Rewards Points: 26,352
Default

Absolutely NO-ONE has ever used a buck-boost transformer to transition from 220VAC down to 120VAC.

A straight up transformer would be used... every time.
telsa is offline   Reply With Quote
Old 08-21-2018, 10:23 PM   #7
Moderator
 
John Valdes's Avatar
 
Join Date: May 2007
Location: South Carolina
Posts: 15,633
Rewards Points: 5,022
Default

Welcome to Electrician Talk.
Please take a few minutes and fill out your profile.
John Valdes is offline   Reply With Quote
Old 08-22-2018, 04:21 PM   #8
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,974
Rewards Points: 1,720
Default

Quote:
Originally Posted by telsa View Post
Absolutely NO-ONE has ever used a buck-boost transformer to transition from 220VAC down to 120VAC.

A straight up transformer would be used... every time.
No electrician or electrical engineer would in the field


SOME UPS manufactures use buck-boost in their UPS to go from 480 to 208/120, I have never been able to figure out why and no tech in the field can tell me.
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Old 08-23-2018, 02:14 PM   #9
Junior Member
 
Join Date: Aug 2018
Location: New England
Posts: 3
Rewards Points: 6
Default

Ok, I was mistaken. It was NOT a buck boost transformer we used, but rather a small step down. Guess I have been away from it for too long.
I apologize if I hurt anyone's feelings.
RedneckRodshop is offline   Reply With Quote
Old 08-23-2018, 03:07 PM   #10
Senior Member
 
Join Date: May 2015
Location: Sacramento, California
Posts: 14,053
Rewards Points: 26,352
Default

Quote:
Originally Posted by brian john View Post
No electrician or electrical engineer would in the field


SOME UPS manufactures use buck-boost in their UPS to go from 480 to 208/120, I have never been able to figure out why and no tech in the field can tell me.
Now that IS astounding.
telsa is offline   Reply With Quote
Old 08-23-2018, 04:01 PM   #11
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,974
Rewards Points: 1,720
Default

Quote:
Originally Posted by telsa View Post
Now that IS astounding.
I have NO CLUE what the savings are or the reason for this setup.
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Old 08-23-2018, 07:43 PM   #12
Senior Member
 
Join Date: May 2018
Location: florida
Posts: 1,534
Rewards Points: 1,288
Default

Quote:
Originally Posted by RedneckRodshop View Post
Ok, I was mistaken. It was NOT a buck boost transformer we used, but rather a small step down. Guess I have been away from it for too long.
I apologize if I hurt anyone's feelings.
That makes more sense. I have seen many homes near the American air force bases wired with both Uk 240 and additional USA 120 receptacles that are using a step down transformers.
gpop is online now   Reply With Quote
Old 08-23-2018, 07:48 PM   #13
Senior Member
 
Join Date: May 2018
Location: florida
Posts: 1,534
Rewards Points: 1,288
Default

Quote:
Originally Posted by brian john View Post
I have NO CLUE what the savings are or the reason for this setup.

Its a cheap way to make a avr (automatic voltage regulator) on the incoming side of the ups.
gpop is online now   Reply With Quote
Old 08-23-2018, 09:08 PM   #14
Senior Member
 
Join Date: Jun 2010
Location: Brisbane, Australia.
Posts: 2,903
Rewards Points: 1,440
Default

240 to 120v transformers are readily available now days,
What are you wanting to power,
and what is it's power requirements ?


dmxtothemax is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Generac transformer control transformer troubleshoot MTW Industrial Electrical Forum 2 03-05-2018 09:16 PM
Buck Boost Transformer 380V 240V 3-Phase vinnygalbo PLCs, VFDs, Motors and Controls 5 03-12-2017 09:57 PM
Buck Boost Transformer 2825mdh1 General Electrical Discussion 5 09-28-2016 10:55 AM
Transformer neutral bond sizing (paralleled secondary) haltonelectrician Canadian Electrical Forum 27 06-19-2016 07:21 PM


All times are GMT -4. The time now is 08:22 AM.


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