240v 15a in 415v 3phase out - options?

**variant22** · 31st August 2012, 11:04 AM

Originally Posted by Michael G

Joe's suggestion in post 28 is a possible solution

The thing that I am not 100% on is when we/Joe are talking of VFD's are we talking about:

1) 240v single phase to 240v 3 phase?
2) 240v single phase to 415v 3 phase?

And as for the machine are we talking about:

1) 240v single phase saw
2) 415v 3 phase saw

I am not sure if there is the suggestion to run the single phase 240v machine with a 240v VFD (to control the motor speed) or if the suggestion is to run the 415v machine with a 240v VFD?

It would also be good if there was some specificity detailing the changes to the motor that would be required and a link to this $129 VDF for completeness.

Some of the details appear to be lost or implied in the discussion. The details may well be obvious to anyone with a small amount of knowledge, but unfortunately I do not fit into that category - yet.

**jack620** · 31st August 2012, 11:39 AM

Personally I wouldn't mess with the motor. Just get a VFD to suit. That way if the VFD fails it will be fairly straightforward to return the machine to original.

**jhovel** · 1st September 2012, 02:02 AM

Sorry Variant22, I didn;t make myself clear:
I am talking about single phase 240V into VFD, 240V 3-phase out of VFD, rewiring (internally by motor rewinder) the 415V 3-phase motor to single speed DELTA mode 240V 3-phase. The motor is sold in STAR mode wiring for two different numbers of poles (2 pole: 2880rpm and 4 pole: 1440rpm).
Then using the VFD to regulate the speed to anything you like for different materials.

Single phase motors require a special VFD and that can only be done with motors that don't have centrifugal start switches.
Cheers,
Joe

**variant22** · 3rd September 2012, 09:42 AM

Originally Posted by jhovel

Sorry Variant22, I didn;t make myself clear:
I am talking about single phase 240V into VFD, 240V 3-phase out of VFD, rewiring (internally by motor rewinder) the 415V 3-phase motor to single speed DELTA mode 240V 3-phase. The motor is sold in STAR mode wiring for two different numbers of poles (2 pole: 2880rpm and 4 pole: 1440rpm).
Then using the VFD to regulate the speed to anything you like for different materials.

Single phase motors require a special VFD and that can only be done with motors that don't have centrifugal start switches.
Cheers,
Joe

Thanks Joe, the clarification is just what I needed.

From the wiring diagram above, can you see any reason why the 415v motor could not be rewound? The last thing I want to purchase is a lead weight.

**jhovel** · 3rd September 2012, 07:13 PM

I can't tell from the diagram, but at worst the rewinder will have a bit of fun finding the star point of the two sets of coils. At best it's just a matter of changing over a few terminal blocks.....
In any case, the motor should not need rewinding, just REWIRING.
Cheers,
Joe

Thread: 240v 15a in 415v 3phase out - options?

Thread Tools

Search Thread

Similar Threads

240v single phase to 415v 3 phase conversion

240V 1-phase to 415V 3-phase vfd

differance between U.K 240v and Oz 240v models?

Tags for this Thread

Posting Permissions