How to connect motor?

[netblindpaul]

topquark,
IF he has 6 leads from the iso then he probably has a Y/D starter on the end of it, but he has not yet told us.
If I found 6 leads my 1st thought would be Y/D and I would then look into this from there.
If you swap the ends of one pair of windings all you will do is reverse the field in that winding, not good.
If you swap the wrong pair, you could short 2 phases together almost.

 

[netblindpaul]

He is trying to connect the motor, sorry, but he has 6 wire ends to do it as I understand it.

 

[topquark]

He is trying to connect the motor, sorry, but he has 6 wire ends to do it as I understand it.

Ah sorry, I thought that was 6 leads for the two motors, not for the one.

 

[benji]

whazza are you saying you have connected the motor up and it,s going the wrong way or are you asking how to reverse the motor if it goes the wrong way, also where is the starter for the motor?

 

[silva.foxx]

The OP still hasn't stated whether the motor is two-speed or star-delta started.

With star-delta starting, changing the DoR requires a better understanding of the way its wired rather than just swapping phases. The phases have to be swapped in sets (to or at the motor) or on top of the line contactor. If swapped incorrectly, the motor may start in the DoR you require but may try to swap direction in the delta connection, not a good scenario really!

So... just be careful.

note to self: phases is incorrect term for lines L1, L2 & L3.

@ Whazza22... do you know whether you have two speed motor or star-delta starter? Which?

@ Tony... motor sticky... looking forward to that one.

regs// s.f

 

[Knobhead]

Sorry but what I'm planning will take time

 

[silva.foxx]

Sorry but what I'm planning will take time

Totally agree... finding that out with my App. program. I'll be developing motor starting stuff as part of that, along with VFDs and soft starts so I'll chuck a version your way... in time!

What I'm finding is that, although I hoard shed-loads of info, I have very little or close to zero orgainisation. My filing system over the years has been terrible. I think that's a valid resolution for the New Year!

Although we have the info... we still have to sift through it and collate what's relevant today.

Good luck T, and thanks for sharing.

 

[Knobhead]

Here’s how (a sneak preview)

View attachment 8303

 

[whazza22]

Reversing rotation of motor?

Hi all,

My previous post was a bit vague so I have included a photo to help explain.

http://s193.photobucket.com/albums/z53/whazza22/?action=view&current=Motor.png

Basically I would like to know how to reverse the rotation of the motor. I know you swap any two phases on a 3 phase motor with just 3 cables but how do you do it for a motor that has 2 sets of connections (6 cables)

The two motors are fed from a 3 phase isolator and are for the two supply fans on an Air Handling Unit, with only one running at any time.

Would you swap two phases on one set or on both or something totally different lol

Much appreciated

 

[JD6400]

Re: Reversing rotation of motor?

I think you mean you have a star / delta motor , if so you should have three interlinked contactors ?
If so just swap two phase's that are on the incoming side of the first contactor .

 

[topquark]

Re: Reversing rotation of motor?

The difference in this case is that for each phase you have two connections to a winding and they must be paired correctly and both swapped together.

 

[silva.foxx]

Re: Reversing rotation of motor?

Ideally... you should continue your original thread on this same topic to keep continuity.

If your brown wires are switched from L1 and your black wires from L2 then your diagram doesn't make sense, unless:

(A) you have the labelling of the motor terminals incorrect, or

(B) you have something else "within" the box that you depict as the 'isolator'.

It would perhaps make sense if you had U1, V1 and W1 on the left of the motor terminal block with W2, U2 and V2 on the right of the terminal block, assuming the six wires are identically paired through the isolator. Please check this.

I know you are making a great effort in having us understand your plight but you must understand we cannot see what you have.

What's happening in the isolator. Is there 3 phase into the top of the isolator?

Are you certain it's an isolator as opposed to some form pole-reversing switch?

The six wires to the load... are they paired-up in the bottom of the 'isolator'?

 

[whazza22]

Re: Reversing rotation of motor?

Ideally... you should continue your original thread on this same topic to keep continuity.

If your brown wires are switched from L1 and your black wires from L2 then your diagram doesn't make sense, unless:

(A) you have the labelling of the motor terminals incorrect, or

(B) you have something else "within" the box that you depict as the 'isolator'.

It would perhaps make sense if you had U1, V1 and W1 on the left of the motor terminal block with W2, U2 and V2 on the right of the terminal block, assuming the six wires are identically paired through the isolator. Please check this.

I know you are making a great effort in having us understand your plight but you must understand we cannot see what you have.

What's happening in the isolator. Is there 3 phase into the top of the isolator?

Are you certain it's an isolator as opposed to some form pole-reversing switch?

The six wires to the load... are they paired-up in the bottom of the 'isolator'?

Yes its definately a 3 phase isolator with 3 phases going in the top.

Also the terminals are labelled correctly on the motor and I confirmed this by looking at the connections on the 2nd motor which is working fine.

I will be connecting the 2nd motor which has been repaired and sometimes they are re-wound the opposite way from before.

 

[Guest123]

Threads Merged.

Please keep to one thread.

Thank you.

 

[whazza22]

I have managed to look at the isolator and it has a 3 phase supply at the top, and on the outgoing side it has between 8 to 12 terminals. All of the outgoing cables are in different terminals which are numbered.

Any ideas?

Thanks