2.2kw spindle question

[Alwaysintheknow]

Good day everyone

I am in the process of wiring a 2.2kw spindle to a Haunyang VFD type 2. Checking continuity to determine which of the 3 inputs should receive the ground wire shows that none of them are grounded to the spindle case. I opened up the top to see if any of the wires were loose and I cant tell which of them is the ground. Shouldn't the case be grounded? I would appreciate any input.


Thanks

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[ger21]

Yes, it should be grounded, but the majority (almost all of them) are not. It's a 3 phase spindle, so all 3 wires are power wires, and none are a ground. Your ground wire should be connected to the 4th pin on the connector, and you should connect a wire from the 4th pin inside the spindle, to the spindle body.

[Alwaysintheknow]

Gerry

Thanks for the reply, you are a sea of knowledge and are very well respected in the forums. I should have mentioned that has input three pins, 2 hot and a ground directly from the VFD.

[ger21]

Are saying from the VFD to the spindle, or the power into the VFD?

I was talking about the VFD to the spindle.

[Alwaysintheknow]

Yes. From the vfd to the spindle are 3 wires. 2 hot and 1 ground. One of those must ground the case, none of them show continuity to the case.

Thanks

[ger21]

No, you are incorrect. There are 3 hot wires to the spindle, because it a 3 phase spindle. You need to run 4 wire cable, and add the 4th wire as a ground, as I mentioned in my first reply.

[mactec54]

Yes. From the vfd to the spindle are 3 wires. 2 hot and 1 ground. One of those must ground the case, none of them show continuity to the case.

Thanks

From the VFD to the Spindle you have Terminals U V W and Ground, it sounds like you brought a Spindle that has only a 3 pin connector, which is incorrect you should have a spindle with 4 pin connector to be correct

From the VFD you have 3 Hot wires U V W and a Ground for the Spindle, you will do some serious damage if wired any other way

Some change the Plug and add the Ground

Some mount the Ground wire to the Cap if it is not plastic

Note 4 Pin connector in photo

[Alwaysintheknow]

I wondered why they did not show the input plug for the spindle.....so it looks like I need to switch the 3 wire input plug on the spindle to a 4. Drill and tap a ground lead inside the spindle. The VFD inverts the 220v single phase to a 3 phase 220v? I hope I'm on the right track

[ger21]

Got a link to where you bought the spindle from?

[tonyfoale]

Many/most of these spindles come with a 3 pin plug, probably because they expect the case to be earthed via the machine to which it is fixed. To keep it simple you could run a 4 core cable and just connect the earth wire to the case and keep the 3 pin plug.

[ger21]

I think the vast majority of these come with 4 pin plugs. I've never seen one with a 3 pin plug. Every one on Ebay that shows the pins, has a 4 pin plug.

[Alwaysintheknow]

Here is the link for the spindle and VFD

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I was 4 feet short on the shielded cable I had on hand so I ordered more

https://www.wireandcableyourway.com/...ply-cable.html

I still need the 4 pin connectors and will post my findings soon unless the helpful people here can assist in my search. And a pump that I can use and control from Mach3 with a G540.

Once again, thanks for everyone's assistance

Mark in Michigan

[mactec54]

Many/most of these spindles come with a 3 pin plug, probably because they expect the case to be earthed via the machine to which it is fixed. To keep it simple you could run a 4 core cable and just connect the earth wire to the case and keep the 3 pin plug.

No one outside of China should by a Spindle that has a 3 Pin plug only buy the spindles with the 4 pin plugs which is what most of them are, always check, the 3 pin plug connector is only used in the Chinese market, they sell them anywhere but don't buy them

If everyone stopped buying them the Chinese would stop trying to sell them, these spindles are not compliant anywhere in the world other than China

[ger21]

Not sure if they are the same size, but the ones that came on my spindle look like this.
5pcs Aviation Plug 4-Pin 16mm GX16-4 Metal Male Female Panel Connector New A New | eBay

[tonyfoale]

Every one on Ebay that shows the pins, has a 4 pin plug.

That just isn't true. This was the first item from my eBay search for a 2,2 kW spindle, just now.

AIR-COOLED 80MM 2.2KW ER20 COLLET SPINDLE MOTOR AND MATCHING INVERTER VFD CNC | eBay

[handlewanker]

Hi....what does it matter.......the 3 pins on the spindle are all for and can only be a live input and do not need an earth.

The spindle body with the 3 pin plug would be grounded by the spindle support bracket to the machine itself which is earthed..

This would be a far better fail safe set-up as in no way could your spindle become "live" if the 4th earth wire broke or became detached.......and in no way could you inadvertently connect a live wire from the VFD to the earth pin in the plug.....Human error etc.

There has to be some conformity but in the end it's logical even if you have half a brain.

I do not subscribe to Mac's Chinese bias comment as it's totally ambiguous and irrelevant.
Ian.

[ger21]

That just isn't true. This was the first item from my eBay search for a 2,2 kW spindle, just now.

Apparently, Ebay UK gives different results than Ebay in the US.
I didn't see any when I searched Ebay.

[ger21]

The spindle body with the 3 pin plug would be grounded by the spindle support bracket to the machine itself which is earthed..

Your assuming of course that the spindle clamp is grounded (earthed). I can show you 100 machines here where that's not the case.

[tonyfoale]

Apparently, Ebay UK gives different results than Ebay in the US.
I didn't see any when I searched Ebay.

Very strange. That would be more understandable if the ones on the US eBay were 110 v not 220 but they are not.
Maybe stranger is that I bought mine off US eBay on a trip to the US and it has 3 pins. Weird. ?????

A separate and general question. What work do the people on here do with their spindles? I am getting the idea that it is mainly wood routing which I guess loads up the spindles pretty well. I use mine for milling aluminium with very small cutters or internal grinding steel in the lathe, both of which are fairly light duty.

[Alwaysintheknow]

Your assuming of course that the spindle clamp is grounded (earthed). I can show you 100 machines here where that's not the case.

Gerry

Do you have your machine frame grounded separately to your power source or directly to a ground earth spike?