burned coil?

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
Volter
Posts: 105
Joined: Mon Jan 12, 2009 7:36 am
Contact:

burned coil?

Post by Volter » Sat Nov 16, 2013 7:35 pm

I got a range hood that does not fan out. There is power coming in, the red and black wires are hot and the coil on the transformer is hot as well. If the coil indicates that there is power it still can be burned, correct? Is there anyway to find out that the coil is bad?
Thanks much.

User avatar
Externet
Posts: 1834
Joined: Fri Feb 01, 2002 1:01 am
Location: Mideast USA
Contact:

Re: burned coil?

Post by Externet » Sun Nov 17, 2013 6:38 am

If you call 'transformer coil' to the fan motor windings; and they are hot, turn off and check the fan blades are free to spin by hand. If hard to spin, lubricate the bushings and turn them by hand until free from drag. Then it may work.
- Abolish the deciBel ! -

Volter
Posts: 105
Joined: Mon Jan 12, 2009 7:36 am
Contact:

Re: burned coil?

Post by Volter » Sun Nov 17, 2013 12:13 pm

Sorry, I did not mean the coil is hot as HOT, I meant it conducts, I used the tester that test the inductance like one can use on wires without actually touching the bare wire. The fan spins freely and when I check the coil it does conduct power(?).
Thanks.

User avatar
Lenp
Posts: 1391
Joined: Thu Oct 26, 2006 8:11 pm
Location: Maryland
Contact:

Re: burned coil?

Post by Lenp » Fri Nov 22, 2013 9:32 am

Hi
There's some oddities and missing clues here.

Those handy glow testers only measure the presence of an AC field, and if the motor winding or the neutral side of the line is open, it will still glow if power is applied, which really tells you little. Disconnect the wires and measure the continuity of the motor coil with an ohmmeter or use an ammeter to measure the current. Also measure the actual voltage, from line to neutral with a voltmeter.

You say the fan motor has 2 wires, red and black. That is a bit unconventional for a simple AC motor, which is usually 2 blacks or a black and a white!

You also say the 'red and black wires are hot" well that should not be. If it is an AC motor one side is the line connection, usually through a switch or speed control, and the other one is the neutral side of the power line. The neutral side should not be 'hot' and, if it is, that presents the symptom of an open neutral connection someplace.

Is there a fan speed control in the unit? If so that may be a factor in the failure.

Post a picture if possible, maybe the wiring drawing if it is in the unit. Range hoods are usually simple devices with simple circuitry.

The more information gets more accurate help!

Len
Len

“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
"I must be on the way to success since I already have the junk". (Me)

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests