Six-coil, Three-phase Star Delta Starter

For this I would try to contact WEG (full name Wegmann?) directly, repeating to them the nameplate data.

Thanks Tornado

Past closing time now..but it's on the cards for tomorrow morning.

I'm thinking Dehander...and high speed has never been used by the current owner...saw mill was used ...imported to uk from USA 10 years ago fitted with DOL....the idea of it in Dehander high speed dual star is a bit scary.!

Cheers

Vito

http://catalog.wegelectric.com/img/Wiring_Diagrams.pdf

Many thanks Solar eagle

That's given me something to think about for sure.

Ill have a look and see which way to go....interesting that the owner has not been using the full cutting potential of his saw mill...he did mention when he first got it he deformed some new blades feeding in timber of a relatively small size without the motor even seeming to work hard...could be the low speed due to non YY configuration. .?...I guess the spec of the machine was based on the higher speed.

Thanks again... cool forum guys

Vito

..."A 20" blade should be about 1500-2500 RPM, a 12" blade about 2500-4500 RPM, a 10" blade about 3000-5500. SAW SPEED In general, for good saw performance, a rim speed of 8,000 to 9,000 feet per minute is recommended for sawing hardwoods; 10,000 to 11,000 f.p.m."...

blade speed calculator

http://www.cookssaw.com/index.php/increase-portable-sawmill-profits-a-production/how-fast-should-a-bandwheel-turn

http://opensourceecology.org/wiki/Sawmill_Research

If the saw speed does not match with the feed speed for the class of timber (old English oak forest?), especially European hard woods, then I would expect to see pieces flying off the blades and a full stop of rotation in some instances.

That is what I would call scary, because she should be really close to letting the smoke out when treated that way.

Yep...

The guy does green oak A frame buildings and has a pile of seasoned big whole trees lying around that get sawn up for customers who can pay for them...it's beautiful stuff.

I guess their is no rules for this stuff...just guidance...

The green stuff is ok..but some of the seasoned stuff is...er...hard...specially the knots.

Just noticed from one of my pictures that the thermal overload in the motor is not connected to anything..didn't notice it earlier. .now I see 2 small cables in the pic....

Never a dull moment on the Devon & Cornwall border.

Tamar Joinery Company... you can check it out online.

Cheers

Vito

Is it certain that this is a dual speed motor, versus dual voltage?

Just out of curiosity, is it a circular saw or a band saw?

Cool stuff! Cool beer! Hot motors!

It's also not likely a Dahlander motor (2 Speed 1 Winding), it would give you two speeds on the nameplate. A 12 lead motor is just a dual voltage motor that is capable of being started as Across-the-Line, Wye-Delta or Part Winding, depending on your desires. That's what Solar Eagle's data sheet shows, those connection patterns are fairly universal (provided the voltage is what it says it is).

Hi JRaef & Tornado

OK. ..plate says

Frame 326 T

Kw 37

Type ET

RPM 1770

SF 1.25

HZ 60

3/4 load eff 93.6%

Des B

Vlots 208-460

Amps 118/59.0

Sfa 148/74.0A

Duty CONT

208-230v is shown as ΔΔ and the 460v as Δ

A few other bits I can't read due to damage.

All thoughts greatfully accepted

Ta

Vito

Bandsaw

In the end I ran out of time today so didnt get to contact weg to discuss motor specs.

Either tomorrow or Friday I'll be looking at the sawmill and wiring the extra cabling to allow star delta starting..correcting the taped up motor cables...Hopefully there is enough tags left on the motor cable ends for me to identify which coils are which in the fat group of taped joined ends.

I guess the motor plate details I posted didn't help anyone shed more light on the motor type..

Ill post again when I've spoken to weg and/or got it all going.

Cheers

Vito

OK, this might be a better image for you to work with, ASSuming you truly have 12 leads coming into the motor connection box (you said "six coils", that's what I interpret as 12 leads).

So for that motor, if you are running from 480V, you use the High Voltage pattern. it's easy to identify which leads are in a coil, the problem is, you can't identify which coil fallows another. Hopefully enough of the marking remain to at least determine that by a process of elimination to determine the order and the missing lead numbers. Good luck!

Final fall back position: tell the user that the damage to the motor from being connected wrong make it unusable and replace it. 37kW = 50HP, it's in the range of being worth taking it to a good motor rewind shop if he can be without it for a few more weeks, otherwise, just buy a new one.

Thank you again JRaef

Definitely 12 leads...ill post how I get on.

Vito

The price of a rewind is well worth having them label the windings correctly in the repaired motor. This will be below the price of new by a large number.

From there forward, you should:

1. Get the documentation of the windings from the rewind shop
2. Take plenty of photographs.
3. Produce a bound manual, and an emanual (get it), for the final users to pass along after you have moved on.

OK Guys...

Bit of a delay with the star delta starter arriving..then my avalibility to fit it.

But today I got it done ..all up and running without a hitch.

JRaef thanks again for the info and these diagrams...I would have struggled without this stuff having never come across a motor like this before....I have to admit I wasn't looking forward to doing a delander set up...which was what I thought it was to start with.

The missing terminal block was the final straw...��...but in the end I could just make out enough cable lead markers to workout the rest.

Replaced the original delta only wiring as their wasn't enough room in the flexible conduit for it and another 3 cables...rep,aced with some 10mm tri rated.

Used some 32A line taps to make the joints...self amalgamating tape to cover all the live bits...wrapped the whole thing in a sheet of tractor inner tube to stop the thing shorting on the casing again.

All good.

Great forum guys..ill keep an eye on this in the future.

Thanks to all who posted answers and information for me.

Cheers..!

Vitoboy

Sounds to me like you know your stuff really well, and take a lot of attention to detail, and you communicate really well. I give you 5 gold stars, just look up at night, and you will see them.