ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 8 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Portable Motor Winding Heaters #129157
08/29/04 07:56 PM
08/29/04 07:56 PM
H
hypress  Offline OP
Member
Joined: Jul 2004
Posts: 129
Charleston WV
Years ago I worked in a plant that had home made portable motor heaters. We hooked them to the motor T leads at the starter and the unit passed current through the motor windings to keep the windings warm. We used them on motors that did not have resistance heaters built in the motor.(The heater was hooked up only after the starter was locked out and the T leads were disconnected from the starter.)Now what I am looking for is a schematic for a similar unit. The only thing I am for sure of is that it had a large capacitor bank in it I will say aprox 20 and it did operate on 480 volts . Has anyone ever seen a similar unit THANKS HYPRESS

Tools for Electricians:
Re: Portable Motor Winding Heaters #129158
08/29/04 10:37 PM
08/29/04 10:37 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
 
There are controllers for off-cycle stator heating that are intended for fixed installation, but may be applicable to portable use. Two links.. www.motortronics.com/products/otpr.html www.ab.com/en/epub/catalogs/12768/229240/229258/229579/print.html
Not familiar with a capacitor method, but low-voltage transformers and starter interlocking have been detailed in 1970s-era IEEE Industry Applications transactions.




[This message has been edited by Bjarney (edited 08-29-2004).]


Featured:

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

 

Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 18
Potseal 14
Popular Topics(Views)
243,547 Are you busy
180,353 Re: Forum
170,835 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.016s Queries: 14 (0.004s) Memory: 0.9415 MB (Peak: 1.0583 MB) Zlib enabled. Server Time: 2018-01-19 11:32:30 UTC