Thread: Delta or Y?

going by the wiring where it goes down into the stator it does'nt look good
before it gets connected up to power put a megger on it

it would mostly likely be star.....
it should have six leads if it could be wired in delta

Originally Posted by eskimo

going by the wiring where it goes down into the stator it does'nt look good
before it gets connected up to power put a megger on it

it would mostly likely be star.....
it should have six leads if it could be wired in delta

Thanks eskimo.

Most of that gunk is fine sawdust (unit was used on a small docking saw) .
Mega is definitely going on it before it gets fired up.

Cheers

Originally Posted by BobL

Mega is definitely going on it before it gets fired up.

a carpenter who knows how to use a megger....the mind boggles

Originally Posted by eskimo

a carpenter who knows how to use a megger....the mind boggles

What makes you think I'm a carpenter?

My day job involves machine that look like this.

Hi Bob,
Where the leads join into the windings are there 2 winding wires connected to each? If so you have a delta connection.
Regards

Originally Posted by BobL

What makes you think I'm a carpenter?

My day job involves machine that look like this.

same thing
hahahaha

I knew that would get a terse response from an Accountant

ruddy hell what is it...some sort of steam generator/autoclave/distellery (hahaha) ?

Originally Posted by eskimo

same thing
hahahaha

I knew that would get a terse response from an Accountant

ruddy hell what is it...some sort of steam generator/autoclave/distellery (hahaha) ?

Close, It's a high melting point metal evaporator - it's part of a analytical instrument for preparing reference standards for use by the nuclear industry and researchers. This one is a big one (10 kV - 10 A, 2800º) located in Europe, our machines look similar but are much lower power 20Kv - 10 microA, 2000º).

Of course I don't make these machines but if it breaks the nearest engineer is in Sydney so I have to be able to take it apart and fix it if I can. So there's a fair bit of computer interfacing, and bit of electrical and electronics needed. Mechanically they uses exotic stuff like pure gold O-rings to get ultra high vacuum (100 billionth of an atmosphere).

Originally Posted by A Duke

Hi Bob,
Where the leads join into the windings are there 2 winding wires connected to each? If so you have a delta connection.
Regards

Thanks AD, I have the two ends off the motor but I haven't been able to see that far inside it.

Originally Posted by BobL

100 billionth of an atmosphere

and what is that is microns

what type of vac pump pulls down to that

Originally Posted by BobL

Mechanically they uses exotic stuff like pure gold O-rings to get ultra high vacuum (100 billionth of an atmosphere).

Wow, gold O-rings. That is exotic.

Jordan

Originally Posted by BobL

Thanks AD, I have the two ends off the motor but I haven't been able to see that far inside it.

Hi Bob,

If forced to guess I'd say if the nameplate says 415v then it's most likely star, so you need to dig out the star point and bring out the 3 extra wires. I'd suggest you take it to a motor re-winder, it's a 5 minute job for them and they can megger the windings and re-spray a bit of varnish while they are at it.

Also, on older motors the insulation on the wires leading out to the terminal block can get cracked, so it's a good time to inspect those as well.

Regards
Ray

Originally Posted by eskimo

and what is that is microns

what type of vac pump pulls down to that

0.0000076 microns. Turbo molecular and Ti Ion pump combo backed by by a mechanical scroll pump About $100k worth of vacuum gear. The turbo molecular is 7 counter rotating vanes spinning at 50,000 rpm. The Ti Ion pump is a getter type pump.

Originally Posted by RayG

Hi Bob,

If forced to guess I'd say if the nameplate says 415v then it's most likely star, so you need to dig out the star point and bring out the 3 extra wires. I'd suggest you take it to a motor re-winder, it's a 5 minute job for them and they can megger the windings and re-spray a bit of varnish while they are at it.

Thanks Ray. I have shown 2 electricians and an electrical engineer an dthey agree - Star is what I want so I will leave it that way.

I will tidy it up and megger it - if it passes then I'll run it on a regular 3P supply and see how it goes - If it goes OK then I'll try it on a VSD

Pretty sure that would be delta connected.
It is a bit hard to say as the connections are internal.