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

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
TRUE POWER
by jraef. 03/21/17 09:13 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,352 Are you busy
166,085 Re: Forum
160,550 Need opinion
Who's Online Now
1 registered members (HotLine1), 58 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#129157 - 08/29/04 08:56 PM Portable Motor Winding Heaters  
hypress  Offline
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:

#129158 - 08/29/04 11:37 PM Re: Portable Motor Winding Heaters  
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).]



Member Spotlight
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 14 (0.003s) Memory: 0.7419 MB (Peak: 0.8596 MB) Zlib enabled. Server Time: 2017-03-25 00:04:32 UTC