Thread: my new toy. Colchester Chipmaster

Originally Posted by .RC.

3 phase has three actives so each active carries it's share of the electricity...

So if a single phase motor draws 15 amps, that means one wire has to carry the entire 15 amps current flow.

If a similar sized three phase motor draw 15 amps, each wire is only carrying 5 amps..

Yeah but, there is no neutral, so wouldnt it be 10 amps per phase?

Stuart

hi

I was reading recently, my FLOYD text book of electronics, the standard work . They reckon 3 phase is cheaper, more economical than single phase for a given amount of power usage. This is because 3 phase systems use less copper wire than single phase systems . In a industrial environment they count every cent . Mike

Originally Posted by morrisman

A interesting review for you Peter.......... and the manual

The wandering axeman: Colchester Chipmaster Review


Chipmaster Manual 1 of 6

As it happens that is my blog

Good to see people getting use from the uploaded manual.

Did you get the machine up and running? Don't toss the variator if it's working. It works as a torque multiplier in low speeds which the VFD can't hold a candle to. If your getting noise, it can also be the motor bearings. Remove the internals of the under lathe cabinet and grease the motor if you are hearing a whine.

I would recommend getting a rotary phase converter before ditching any of the lathe's components.

Paul.

Hi Stu, your post No.14 made me feel sick. To think you and I paid well over $500 for our Drives Direct VFD's and with so many hassles.

1 5KW VSD VFD Inverter Single Phase 240V TO 3 Phase 415V Variable Speed Drive | eBay

I'm going to hang myself after I finish the bottle.

Ken

Hi Ken,

Hey being on the bleeding edge costs . Don't feel to bad, just had a look at a quad HD phone, looks fantastic! likely worth about $700..how much will it be going for in 4 years?

I wonder if its a mod or they are coming out of China like that?

Stuart

Originally Posted by .RC.

3 phase has three actives so each active carries it's share of the electricity...
So if a single phase motor draws 15 amps, that means one wire has to carry the entire 15 amps current flow.
If a similar sized three phase motor draw 15 amps, each wire is only carrying 5 amps..

That's not quite how I understand it.
If the 3 phase motor is pulling a total of 15A, each phase should be drawing 15/(Square root of 3) or ~8.7 A.
The 3 currents are not arithmetically but vector summed to get the total current.

Originally Posted by samthedog

As it happens that is my blog

Good to see people getting use from the uploaded manual.

Did you get the machine up and running? Don't toss the variator if it's working. It works as a torque multiplier in low speeds which the VFD can't hold a candle to. If your getting noise, it can also be the motor bearings. Remove the internals of the under lathe cabinet and grease the motor if you are hearing a whine.

I would recommend getting a rotary phase converter before ditching any of the lathe's components.

Paul.

Hi Paul.
Thanks. I was going to get the 240v~415v VFD as it is much cheaper than the rotary converter .
so no i haven't got it running yet . need a good clean up as it is aging .
Peter

Going back to post 14 and following, I have to say the eBay item is a standard 380V 3-phase to 3-phase Huanyang VFD. I think someone should talk to the seller and get a lot more info before getting high hopes.....
There are lots of mis-advertised VFD coming from China and the seller may have just passed that bad information on. I've read quite a lot that say something like "suitable to run 380V 3-phase motors from 220V single phase", meaning "if rewired from star to delta configuration" which means little to uninformed sellers....

Originally Posted by jhovel

Going back to post 14 and following, I have to say the eBay item is a standard 380V 3-phase to 3-phase Huanyang VFD. I think someone should talk to the seller and get a lot more info before getting high hopes.........

Yep I agree. I nearly got caught out like this last year and after an email exchange with the seller they eventually sent me the model number and it turned out the be a 3P/3P Huanyang VFD.

Originally Posted by jhovel

Going back to post 14 and following, I have to say the eBay item is a standard 380V 3-phase to 3-phase Huanyang VFD. I think someone should talk to the seller and get a lot more info before getting high hopes.....
There are lots of mis-advertised VFD coming from China and the seller may have just passed that bad information on. I've read quite a lot that say something like "suitable to run 380V 3-phase motors from 220V single phase", meaning "if rewired from star to delta configuration" which means little to uninformed sellers....

well.
I have email them last weeks a few time and haven't got any answer from them . i won't buy anything's from any seller that don't answer my questions . this one seem more like it .
Peter

Originally Posted by samthedog

As it happens that is my blog

Good to see people getting use from the uploaded manual.

Did you get the machine up and running? Don't toss the variator if it's working. It works as a torque multiplier in low speeds which the VFD can't hold a candle to. If your getting noise, it can also be the motor bearings. Remove the internals of the under lathe cabinet and grease the motor if you are hearing a whine.

I would recommend getting a rotary phase converter before ditching any of the lathe's components.

Paul.

THANKS FOR THE INFO . iM GREEN WITH ENVY LOOKING AT YOUR CHIPPY

Hi Peter

Originally Posted by thorens

I have email them last weeks a few time and haven't got any answer from them .

"This seller is currently away until 14 Aug, 2014"


Stuart

Well Stu, we might be safe after all being the only two to have the special Direct Drives vfd.

Perhaps we weren't fleeced after all.

Ken

Originally Posted by samthedog

As it happens that is my blog Good to see people getting use from the uploaded manual. Did you get the machine up and running? Don't toss the variator if it's working. It works as a torque multiplier in low speeds which the VFD can't hold a candle to.

Interesting comment seeing as one of my complaints WRT the Kopp variator in my lathe is the lack of torque in low speed high range (400 rpm). A heavy cut or a big drill bit causes very noticeable loss of speed. I've pulled my variator apart and changed the oil to one I know is correct. There's no visible wear or noise from it but the lack of torque has always been there. PDW