flaktwoods fan speed controller wiring?

[bluesky]

i have been called to see a extractor fan problem, the owner complained that when he turned on the flaktwoods fan speed controller then the fuse would blow and the circuit breaker trip.

I had a look, there are three cables with the fan: red-z, blue-u, black-uz,

i was thinking something wrong with the speed controller first, then i tried to bypass the speed controller, i connect the red, blue and red from fed together, then black with black from fed together, but the fuse still blows,

I had a look, there are three cables: red-z, blue-u, black-uz, i measured the resistance between them: red-blue: indefinite, red-black:indefinite, blue-black:2.0 OM. is this means the fan is gone?

someone had this before?

really appreciate your help!!!

 

[Gage]

what does it smell like. and windings should be balanced + over 1MΩ IR so yes.

 

[bluesky]

thanks Gage,

the fan is outside, so could not smell anything,

so what does the black cable do? am i right to connect it to neutral?

so z and u can be connected to live?

 

[Bobster]

Do you have a model number for the speed controller?

 

[Gage]

thanks Gage,

the fan is outside, so could not smell anything,

so what does the black cable do? am i right to connect it to neutral?

so z and u can be connected to live?

Are you talking about wiring up the motor or the speed controller here?

If the motor just put it in how it came out otherwise I'd prefer to see the connection terminals myself before I tell you how to wire it. Surely the instructions would be inside the termination plate anyway.

(Strange thread because I literally just started reading a very good book about speed controllers for my light reading haha.)

 

[bluesky]

hi Gage, i am trying to bypass the speed controller, connect the power with the fan directly, so i will be sure if the speed controller is wrong or not, but i dont knoe how do the 3 cables work

 

[bluesky]

hi Rob2, i dont have the model number, but it is a one phase, 3 wire one,

 

[Gage]

Capacitor start?

 

[bluesky]

do you mean 2Ω is ok?

 

[Gage]

do you mean 2Ω is ok?

Is the motor capacitor start?

And is that 2Ω IR?

 

[bluesky]

no idea, i just measued resistance between blue and black, it was 2ΩΩ

 

[Gage]

Lol just leave this for someone who knows what they're doing.

 

[Bobster]

How as a arms member do you not know the difference between continuity and IR testing?

i was only asking as some speed controllers use a vsd which will convert single phase to 3phase.

 

[bluesky]

Rob2, before i answer your question, could you let me know what is uz,u and z for? really appreciate if you can help

 

[Gage]

Us are running windings and Zs are starting. (Hopefully). Now answer Robs question

 

[bluesky]

Gage,i dont know waht you are talking about although sounds you know the answer, if you can give more details that will be great,

 

[Gage]

I'm not going to give (from what I've gathered) an incompetent person potentially dangerous advice.

 

[Marvo]

First rule with small single phase fan motors is the the colours of the internal motor wiring don't necessarily conform to the usual standards of blue/black = neutral and brown/red = live etc, depending on the manufacturer you'll find green or yellow wires as different speed windings and you'll find reds and even browns used as commons and neutrals inside the motor itself.


I'm not familiar with the woods fan you're working on....especially since you still haven't given a model number but I can tell you there's a good chance you'll need to move the capacitor onto different terminals if you remove the speed controller. Likewise when you install one you might also need to relocate the cap wiring.


What type of motor is it? Give us a model number or at least run a google images search and give us a photo of something similar.

What type of speed control is it? Is it a transformer type or is it a PWM type?

Whatever changes you make it's critical that you check the run current when you've finished and make sure it's equal to or less than the current on the motor info plate. It's also a good idea to listen to the motor, if there's any signs of iron noises such as rumbling or grating sounds then switch off before the motor is magically transformed into scrap. If you have little or no experience with this type of motor and speed control arrangement then there's a good chance you'll damage the motor beyond repair so if you can't afford a new replacement then rather get someone with knowledge to assist you.

Just for info, if it's a single speed fan U1 will be the common point of both windings. Test between U1&U2 for one winding and test between U1 and Z2 for the other. There should also be other wires in the motor that are for safety, they might be labeled as 'K' or 'S' or even 'T' depending on whether a thermistor/klixon/thermostat is used on the windings. It would be a very shrewd move to incorporate these into your DOL control or switching contactor as an interlock.


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