Have Single Phase spindle but 3 phase power

[david_gregas]

Just moved to a new shop that has 3phase power,but own a single phase spindle what do I have to do to get it running.

[Gary Campbell]

David...
Check with the Mfgr of your VFD. Some that convert single to 3 phase will also work on 3 phase. Only the Mfgr will know for sure.
Gary

[david_gregas]

Gary I have a HSD spindle and a Yaskawa VFD which came with my PRS. I ordered the single phase unit because at the time I was using the Bot in a garage with normal house current. The spindle is rated @ 220v + or - 10%. I had an electrician at my new shop and he managed to get me 210v from the 3 phase panel by eliminating one of the 3 legs. I am not sure of using this because it may be out of phase.Is my concern justified. If there is anyone out there that can shed some light on this situation please chime in before I do something stupid.

[Gary Campbell]

David...
Without knowing exactly what you have for power, or VFD I can give no good advice. I did look on the Yaskawa Site and there is a different model# for single and 3 phase power. Here is a link to the drive .PDF. http://www.clrwtr.com/Yaskawa-V7-VFD-Drives.pdf

Hopefully your electrician can get you the single phase 240V that you need.
Gary

[frank134]

Hi I am frank and a license electrican. you are find. you get single phase from three by onlt using two of the legs. you don't need anything. your electrican wire it right.

[frank134]

also I forgot if you only have 220 volt and need if to be 240V you can buy a buck/boost trans for it. just call you local electric supply. tell then what voltage you got, what you want to go to and the amp or watts of the spindle and they should be able to help you. If they can't write be with the info and I will do the math for you.
frank

[david_gregas]

Frank the spindle wants 220 volts +or- 10% the VFD is asking for 230 volts we tested the the 2 legs and it is 210 volts. Is this good enough or do I need a transformer, also how much does one of these transformers cost.

[frank134]

for what you want it may cost around $100.00. also check to see if you have super long wire run. If your over 100 feet your going to have a voltage drop. If this is the case just up the wire size. from #12 wire to #10 wire. go up one size for every 100' a good rule of thum. I don't think 10 + or - should hurt.

[dana_swift]

Short answer, usually 3 phase power has a leg pair set up to provide 110v/220v single phase as one of the wiring options. If its not clear to you where to get that power from the breaker box, hire an electrician and have them get you fixed up.

Most likely you will just have to wire to the appropriate terminals on the breaker box.

However.. if you have 208 volts, don't use it as if it is 220 single phase, as it WILL overheat 220 volt single phase motors and burn them out prematurely. Using three phase motors for things like dust collection will save you a bit of money for the power, and the motors are more efficient. Not to mention you are already wired for that option (im envious!)

D

[david_gregas]

Dana, 3 phase would be great if I had a 3 phase spindle but I have a single phase 2.2hp HSD spindle and the VFD that came with it (from Shopbot). I am in no mood to replace it and am looking for the fastest, easiest and cheapest way to get going.Like I said before right now I have two legs of a 3 phase circuit at my disposal, it has been metered to be 210 volts and am wondering if I can use this straight up or have to go through the hassle of getting a transformer.There are some specs @ this web page http://www.clrwtr.com/Yaskawa-V7-VFD-Drives.pdf but it makes no sense to me so if anyone out there can set me straight I'd owe them an enormous debt of gratitude.

THANX Dave

[bleeth]

David: A 3-Phase panel consists of a series of legs in which every third one is a high leg that outputs 220 volts (or 208 or 230 or...) and the others output 110. You can easily put a single phase 220 breaker in two of the adjacent 110 legs and run your single phase VFD.
Due to length of run from main panel in my shop I set up a 80 Amp sub panel by the shop bot. We also have some equipment that is 3 phase and some that is not. One can use a high leg and low leg in combination for a 220 single phase circuit but make sure you never use a high leg for a 110 circuit.
If your panel isn't already marked for which are the high legs or anything Frank (above)or I seems to be confusing then take his advice and for the small service call get an electrician.
The specs on your VFD say it is comfortable running anywhere from from 200V to 230 volt input. Therefore your 210 actual should be just fine.

[david_gregas]

Dave, first let me thank you for your reply. I did have an electrician there (supplied by the landlord) that I was leery of, in my unit he gave me a a 12 /3 wire red, black, white and ground at the panel he has the red on the A the black o the B the white is not connected, when metered the wires in my shop (red and black) were @ 210 volts. Does this setup sound correct to you, I'm going to wire it to the VFD and give it a go if you have a bad feeling about this please chime in.

[wberminio]

David

When I setup my machine I had a similar situation as Dave R.We setup a subpanel for my 3-Phase HSD spindle and vacuum..We put separate breakers on 2 of the 110 legs also for other equipment.As I recall the voltage did vary some,this is to be expected.Most, if not all, machines allow for some variation in voltage,including your VFD,as Dave mentions above.You should be fine,wire it up and watch the dust fly!

Erminio

[david_gregas]

Well hooked her up today and ran it, seems to be okay, sounded a bit different (smoother) but it could be the new space. The spindle felt lukewarm after the warm up routine but I wouldn't know if this is any different than before because I never felt her up in the old shop, but the wires were cold hope that's a good thing. Just want to thank all of you for the help.

David