Running 3 phase lathe via an inverter from a single pahase supply
Running 3 phase lathe via an inverter from a single pahase supply
(OP)
I have a Boxford CUD lathe, 3 phase. I have bought an inverter (Kasuga KVFH-200v-0.75Kw). I have been told I need to change over some connections in the motor to change it from star to delta. The motor connections at present are
Terminal A - Red & white cables, Terminal B - Yellow & white cables, Terminal C - Blue & white cables, Terminal N - Brown & black cables. I think the white cables are the supply cables.
The plate from the motor suggests the following connections for Delta - Terminal A - Red & Brown, Terminal B - Yellow & white, Terminal C - Blue & black, no connections to terminal N. I have digital pics of the terminals if anyone is interested.
As you can probably tell I am not an electrician, I am just trying to get an idea of whether I this is a job I can do myself or if I should just bite the bullet and get in a qualified spark to do this for me. All help greatly appreciated.
Terminal A - Red & white cables, Terminal B - Yellow & white cables, Terminal C - Blue & white cables, Terminal N - Brown & black cables. I think the white cables are the supply cables.
The plate from the motor suggests the following connections for Delta - Terminal A - Red & Brown, Terminal B - Yellow & white, Terminal C - Blue & black, no connections to terminal N. I have digital pics of the terminals if anyone is interested.
As you can probably tell I am not an electrician, I am just trying to get an idea of whether I this is a job I can do myself or if I should just bite the bullet and get in a qualified spark to do this for me. All help greatly appreciated.





RE: Running 3 phase lathe via an inverter from a single pahase supply
Your motor may be wound for two or even three voltages. Pick the configuration that matches the drive output voltage.
RE: Running 3 phase lathe via an inverter from a single pahase supply
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Sometimes I only open my mouth to swap feet...
RE: Running 3 phase lathe via an inverter from a single pahase supply
I will also scan in a copy of the terminal block from the inverter instructions if these image links work.
Thanks again for your help
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RE: Running 3 phase lathe via an inverter from a single pahase supply
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Sometimes I only open my mouth to swap feet...
RE: Running 3 phase lathe via an inverter from a single pahase supply
It looks like the images loaded ok so I will upload the wiring diagram from inverter manual, see if it makes sense to anyone. Is the 'commercial power supply line' my single phase supply? So will terminal T be earth? Does it matter which way round L & N are connected to terminals R & S, or am I way off the mark.
Also on the motor connection images it tells me there should be black & white cables @ terminal N in star but the actual wiring of the motor there are 2 browns & a black.
So am I right in saying to re-wire the motor in delta (mesh?) I need red & brown @ terminl A, yellow & white? @ terminal B, blue & black @ terminal C, and nothing connected to terminal N.
The lathe is actually up at my dads & i'm off up to see him this weekend so I will see if I can get any more info on the motor. I realise this is probably all basic stuff to most of you but it would be great to get this little lathe up & running.
Thanks for all your help.
RE: Running 3 phase lathe via an inverter from a single pahase supply
You need to determine which brown wire is associated with which phase to ensure you connect it correctly. To be honest you should probably get some help from a competent person because there are other things such as an emergency stop which are required. No one on this board wants to see anyone get hurt as a result of well-intentioned advice which was misunderstood. Don't take that as a criticism - many of us here work in the high hazard industries and have a very safety-conscious attitude.
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I don't have an attitude problem. You have a perception problem...
RE: Running 3 phase lathe via an inverter from a single pahase supply
Thanks Again.