Extractor Fan With Capacitor,wiring Tips?

[buddha]

hi all,i have to put back a big extraction fan with huge hood,however took it down just ripped the cables from there terminals.

there is a 4 core flex from the fan motor yellow/green...black....brown...and turquise cores,and there is a big capacitor with a brown core and a blue core coming out of it.

anyone know how this thing goes together with the supply flex from the fused spur?

 

[ProDave]

Google the fan and fan controller to see if you can download the wiring instructions.

 

[Marvo]

Motor make and model number would be good. Otherwise a photo of the motor terminal box. Is there just one capacitor or is there two?

 

[buddha]

can't really read anything on the fan,fan is about a foot in diameter,its just got a capacitor,which i think should be wired in parralel to the suppy,not sure where the 4 cores come into it though

just one capacitor

 

[Marvo]

If you look inside the connection box on the motor itself there should be a terminal block. Assuming it's not supplied by a reversing setup I'm guessing there will be a couple of straps/links, can you tell us where the links are fitted ie U1-W2 and V1-U2 for example. 

 

[buddha]

If you look inside the connection box on the motor itself there should be a terminal block. Assuming it's not supplied by a reversing setup I'm guessing there will be a couple of straps/links, can you tell us where the links are fitted ie U1-W2 and V1-U2 for example. 

i'll have a look tmrw mate

 

[Marvo]

Cool, while you're there take some photos, pictures will give better info if you can attach them on this thread.

 

[buddha]

i'm gonna try this 

flex brown - brown of capacitor-brown feed

turquoise-blue of capacitor-blue feed

black-connector block on its own

earth with supply earth

Cool, while you're there take some photos, pictures will give better info if you can attach them on this thread.

good idea thanks will do,they want it in by tmrw,but the wiring is accessable so can change it later

 

[Andy™]

i'm gonna try this 

flex brown - brown of capacitor-brown feed

turquoise-blue of capacitor-blue feed

black-connector block on its own

earth with supply earth

good idea thanks will do,they want it in by tmrw,but the wiring is accessable so can change it later

yes, just go ahead and guess.

worst case it goes bang then you need to replace it, then they wont be getting it done tomorrow...

 

[Marvo]

i'm gonna try this 

flex brown - brown of capacitor-brown feed

turquoise-blue of capacitor-blue feed

black-connector block on its own

earth with supply earth

Just make a note of the capacitor details such as microfarads and discharge voltage before you try wiring it blind, sometimes caps are difficult to read after they've gone bang.

 

[buddha]

i'll let you know if it goes bang

 

[buddha]

You could burn the motor out if connected wrong, it cold smoke, could go bang or could catch light !

Is this yours or a customers ?

If its a single phase fan motor with a single capacitor then that will be a permanent capacitor motor

Most fans have a connection diagram in the motor connection lid

There should be (normally) 4 winding wires

2 should be labelled U1 and U2 and the other 2 should be labelled Z1 and Z2 (depending how old it is)

Get some more info and take some photos and come back and post here.....

thanks thats good advice,i will do that

Just make a note of the capacitor details such as microfarads and discharge voltage before you try wiring it blind, sometimes caps are difficult to read after they've gone bang.

fair point ,thanks,gonna get some more info tmrw 

 

[buddha]

And if the leads are not marked then if 4 wires measure the resistance between each and mark and make notes

If only three wires and not marked then again, measure resistances, mark wires and make notes

Post back here....

will do mate,its defo 4 core flex,looks like only three cores have been ripped out,(you can still see strands left in terminal block,but only 3 like this)

 

[buddha]

quick update on the fan saga,looks like the capacitor is there to help start it,the fan is an ecofit one,made by a french firm,got a diagram which says the blue/turquiose core goes with supply live,the black goes with supply neutral and one side of the capacitor and the brown goes to the other side of the capacitor.left it alone today,gonna give that a go on saturday,will let you know.THANKS FOR YOUR HELP EVERYONE,love this forum!

 

[buddha]

Its a permanent capacitor motor - a start capacitor switches out after start

The one you have is in permanently

It gives a phase shift (sort of) to the start winding so the starts and runs (windings) have a different north and south pole to get the rotor moving.....

nice one

 

[buddha]

the fan is up and running,I even put it the right way up,thanks all for your help.I need to find something else to worry about now

 

[matt.leung]

when disconnecing anything like this, i always take a quick pic before hand as u never know when it might be useful...

 

[buddha]

good advice,i would  have but o this occasion I didnt take it down