Posting here in case someone has done a conversion from 3-phase to single, or has a single-phase motor lying around.
My 280synchro is 3-phase but I want to convert it to single phase. Reading here I see that some were supplied with single-phase motors and this is what I am looking for.
Cheers
Pete.
Viceroy single-phase motor.
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Andy B
- CNC Guru
- Posts: 396
- Joined: Mon 20 Nov , 2006 18:19 pm
- Hardware/Software: 280 VS lathe, Denford Senior E-type mill, Senior Major Universal Mill
- Location: East Midlands, UK
Pete,
Apologies if the following is obvious to you already.....
On the 280 Synchro the mechanical installation of a 1ph motor should be
fairly simple. Electrically, so I'm told by others who have had contactor problems with these machines, it is not so simple as cables thread their way around and through the cabinet, electrical panels, etc..
So whilst I believe these lathes were supplied with a 1ph option, it is much easier to build it like that compared to converting from 3ph!
Are you intending to keep the reversing capability and safety inter-locks?
If so, you'll need to run 4 wires to the motor instead of the 3 which will be there now (plus earths).
Have you checked the coil voltage of the contactors that you have now? I have a feeling that they are 'high' voltage coils on the 3ph machines (i.e. 380-440V) - so you would need to replace those or find replacement 220-240V coils (which do turn up on ebay occasionally - the contactor type is obsolete).
Is there a (3ph) suds pump fitted, and do you want to use it?
I don't mean to put you off converting it - just to suggest a balance between the work of doing so to getting a static phase converter.
Andy
Apologies if the following is obvious to you already.....
On the 280 Synchro the mechanical installation of a 1ph motor should be
fairly simple. Electrically, so I'm told by others who have had contactor problems with these machines, it is not so simple as cables thread their way around and through the cabinet, electrical panels, etc..
So whilst I believe these lathes were supplied with a 1ph option, it is much easier to build it like that compared to converting from 3ph!
Are you intending to keep the reversing capability and safety inter-locks?
If so, you'll need to run 4 wires to the motor instead of the 3 which will be there now (plus earths).
Have you checked the coil voltage of the contactors that you have now? I have a feeling that they are 'high' voltage coils on the 3ph machines (i.e. 380-440V) - so you would need to replace those or find replacement 220-240V coils (which do turn up on ebay occasionally - the contactor type is obsolete).
Is there a (3ph) suds pump fitted, and do you want to use it?
I don't mean to put you off converting it - just to suggest a balance between the work of doing so to getting a static phase converter.
Andy
Hi Andy.
I just won a 2HP single-phase motor last night on ebay, so I'll be using that. I have no problem running the extra wires to the motor and no problem at all mounting it. Luckily it has the 19mm shaft already which is handy so I can fit the drive pulley straight on.
I'm hoping to use a capacitor dodge to run the 3phase coolant pump on 240V, if it's the sort that will. I'll post details when I've done that too. I'm told that with the small motors you can just wire 240V to two legs of a delta-wound motor and a cap to the third. If it blows something up I'll just get a single-phase motor to drive the pump.
The contactors I haven't investigated yet. Finding contactors wouldn't be too hard as we have an expert at work, but it would be nice to keep the ones already fitted.
Thx for the reply
Pete.
I just won a 2HP single-phase motor last night on ebay, so I'll be using that. I have no problem running the extra wires to the motor and no problem at all mounting it. Luckily it has the 19mm shaft already which is handy so I can fit the drive pulley straight on.
I'm hoping to use a capacitor dodge to run the 3phase coolant pump on 240V, if it's the sort that will. I'll post details when I've done that too. I'm told that with the small motors you can just wire 240V to two legs of a delta-wound motor and a cap to the third. If it blows something up I'll just get a single-phase motor to drive the pump.
The contactors I haven't investigated yet. Finding contactors wouldn't be too hard as we have an expert at work, but it would be nice to keep the ones already fitted.
Thx for the reply
Pete.
Just to follow-up.
Andy is right the 3-phase contactors won't pull-in with 240V power - but I've found a way to make them do it! I will start a new thread in the Machines section detailing the process. You can keep all the stock buttons and contactors and run a single phase motor no problem (so far).
When I get my motor I'll set-about trying to figure out how to reverse it with the switches I have.
Pete.
Andy is right the 3-phase contactors won't pull-in with 240V power - but I've found a way to make them do it! I will start a new thread in the Machines section detailing the process. You can keep all the stock buttons and contactors and run a single phase motor no problem (so far).
When I get my motor I'll set-about trying to figure out how to reverse it with the switches I have.
Pete.