ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
How's Florida doing with Hurricane Ian?
by Bill Addiss - 09/28/22 12:41 PM
Tough being a lineman's kid
by Bill Addiss - 09/28/22 12:39 PM
GFCI's pops in large numbers
by dsk - 09/26/22 04:35 AM
AFCI’s Revisited
by sparky - 09/24/22 09:58 AM
NFPA Price Increase Coming
by Bill Addiss - 09/23/22 02:22 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 17 guests, and 9 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jul 2004
Posts: 129
H
hypress Offline OP
Member
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

Joined: Apr 2002
Posts: 2,527
B
Moderator
 
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).]


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Trumpy
Trumpy
SI,New Zealand
Posts: 8,423
Joined: July 2002
Top Posters(30 Days)
Popular Topics(Views)
297,533 Are you busy
228,344 Re: Forum
213,223 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5