No links fitted in motor terminal box?

[Amp David]

Is this correct. We have removed a 2KW air extraction fan today to relocate. L1L2L3 connected to U1V1W1 but their wasn't any links fitted to make either star or delta.

There's no plate attached anywhere either.

How come, always thought the links had to be fitted to make star or delta for the motor to run. My so called experienced leader didn't have an answer for me, so will probably end up fitting it back as was, but would like to know if its correct or not.

Many Thanks in advance

 

[telectrix]

maybe linked internally so it can't be altered from star to delta or vice versa

 

[Amp David]

Never thought of that Tel. I'll check when we go back. Wouldn't they put a notice on to say so though?

 

[Deleted member 26818]

Are there only the 3 conductors?

 

[Amp David]

Yeah just 3 spin.

 

[johnboy6083]

ive never seen this amp, and i install a lot of motors. The main ones that only have 3 conductors accessible are sump pumps, or 1ph motors.

 

[Deleted member 26818]

Could it be single phase, with the extra conductor to switch direction?

 

[Knobhead]

Don’t worry about it. It’s quite normal for only 3 leads to be bought out to the terminal box. Usually they will be star connected internally.

 

[Knobhead]

Could it be single phase, with the extra conductor to switch direction?

? ? ? ? If it were a reversible single phase there would be four connections.

 

[johnboy6083]

i wasgoing along the lines of the ends of three windings being brought out into the terminal box, but only 3 being terminated to, with no links?

 

[Amp David]

Definitely 3 phase as we disconnected the supply before moving

 

[Deleted member 26818]

? ? ? ? If it were a reversible single phase there would be four connections.

Not necessarily.
I've seen many with only three conductors, very common on roller shutters.

 

[Knobhead]

Would be interested to see a diagram of one.

 

[Deleted member 26818]

http://uk.wrs.yahoo.com/_ylt=A0PDod...**http://www.tubular-motor.com.tw/tubular.htm

 

[Knobhead]

OK so what’s in the little box marked “electronic”?

 

[supasparxs]

Definitely 3 phase as we disconnected the supply before moving

didn't you identify the terminals before you disconnected it?

50% chance of the motor running backwards

 

[Deleted member 26818]

OK so what’s in the little box marked “electronic”?

Don't know, could be the limit switch or thermal overload.
It's not a manufacturer I've had experience of, just the first I came accross on the net.
Here's one without: Silent Gliss Product Information

 

[Amp David]

didn't you identify the terminals before you disconnected it?

50% chance of the motor running backwards

Yes, why? Just wondering why no link in terminal box thats all

 

[Deleted member 26818]

The links are there to allow moters to be wired in either star or delta.
Perhaps as the motor is so small, it is intended for it to only be used in delta, perhaps the system uses a variable speed controller?

 

[Mark_Burgess]

Could it be single phase, with the extra conductor to switch direction?

Hope not, its an extractor.

 

[supasparxs]

Yes, why? Just wondering why no link in terminal box thats all

If you didn't identify the phase sequence, there is a 50/50 chance of the phase sequence to be wrong

 

[Amp David]

Well i know that one, all my question was is why there was no links fitted in the terminal box.

 

[Knobhead]

Dave, have you got the new motor fitted and working?

Please say yes! If yes then this can be dropped.

PLEASE ! ! ! !

 

[Amp David]

YES!!!!!

Thank the lord!!!!

Guess what? It ran just like it did before, so as my OP asked was regards the linking of terminals, then they were obviously linked internally.

Thanks to those advising of this