[msdeltaguy]

Have a problem I need some help with.

Bought a chinese spindle and VFD 2.2Kw and have a voltage issue. Seems that voltage is leaking and when i touch my cnc table at time i get shocked. I tried running a ground wire from my outside ground rod to the table but as soon as I start the spindle it throws an error code.

Any idea's

[KidKhaos]

I have one also, it works great. Never had this problem but I'm willing to bet you wired it wrong. I would start by checking your voltage supply (can't imagine why this would cause a problem but why the heck not start with the simplest thing to check) and one set of input it output wires at a time triple check my connections.

I can try to shoot you over a picture of how mine is wired if you think it will help. After you absolutely sure everything is connected correctly as the seller what they think. I know everyone here claims you have zero support when you but Chinese stuff but I find that to be untrue. They really want good ratings on whatever sir you purchased from. I have had steppers, 3D printer control board, once a 1500mm ballscrew replaced free of cost from different sellers. They want it to work for you so they can sell more!

Post a picture of how you wired this thing and maybe some people can chime in with help!

[msdeltaguy]

yes please send a picture.

Also when running full speed my VFD is only showing 1.6AMP does this seem right? I figured it would run higher that that being an 8 amp spindle.

[ericks]

Have a problem I need some help with.

Bought a chinese spindle and VFD 2.2Kw and have a voltage issue. Seems that voltage is leaking and when i touch my cnc table at time i get shocked. I tried running a ground wire from my outside ground rod to the table but as soon as I start the spindle it throws an error code.

Any idea's

This is a dangerous situation!!!

[ericks]

Firstly you should never power up a device like this without having its earthing properly done. So you need to have the spindle motor earthed.....not through the machine frame or table...on the spindle motor.
Best is to test your installation/connections before even powering up.....

Do you have an Electrical tester handy??

[KidKhaos]

Firstly you should never power up a device like this without having its earthing properly done. So you need to have the spindle motor earthed.....not through the machine frame or table...on the spindle motor.
Best is to test your installation/connections before even powering up.....

Do you have an Electrical tester handy??

No joke the manufacturer of mine said grounding is optional and that they routinely do not ground theirs in a video showing them running it groundless. I felt discouraged from using a ground.

Mine is grounded so you should be able to copy my setup.

I will send a picture of mine tonight after I get home from work later on this evening.

[ericks]

We are going to do two tests.....
1) Confirm that all three motor windings are present/connected properly
2) Test for any shorts between the windings and the frame of the motor...

[msdeltaguy]

Firstly you should never power up a device like this without having its earthing properly done. So you need to have the spindle motor earthed.....not through the machine frame or table...on the spindle motor.
Best is to test your installation/connections before even powering up.....

Do you have an Electrical tester handy??

I have a fluke T87 will this be sufficient ? If so tell me what I need to test. I just rewired my spindle like this. Mine was in a different order using pins 1,2,3

U=Pin 1
V=Pin 2
W=Pin 3

[ericks]

I have a fluke T87 will this be sufficient ? If so tell me what I need to test. I just rewired my spindle like this. Mine was in a different order using pins 1,2,3

U=Pin 1
V=Pin 2
W=Pin 3

Great.....having the tester will help a great deal When you come online and you are at the machine i'll run you through the test procedure....

[msdeltaguy]

Great.....having the tester will help a great deal When you come online and you are at the machine i'll run you through the test procedure....

im ready its 4am here in Mississippi LOL

[ericks]

im ready its 4am here in Mississippi LOL

Wow..... Okay, first thing to do is turn all power to machine off
Then disconnect the cables on the drive....the ones going to the spindle motor. you may leave the earth cable connected to the drive but u...v..w mus be disconnected.

[ericks]

Your tester should be on the ohm scale....leads in com and ohm/omega. You going to test for resistance

[ger21]

Also when running full speed my VFD is only showing 1.6AMP does this seem right? I figured it would run higher that that being an 8 amp spindle.

When just running, or when actually cutting?

My 8 amp spindle shows about 1.0 -1.3 amps when it's not cutting.

[msdeltaguy]

When just running, or when actually cutting?

My 8 amp spindle shows about 1.0 -1.3 amps when it's not cutting.

When cutting. when cutting with a 3/4 end mill under a decent load (hardwood with a .25inch pass depth) the highest ive seen it get is about 1.9amps @ 18k RPM. I would figure that it would jump up to 3-4 amps at least

[Al_The_Man]

Agree 100%, proper grounding and bonding should be carried out according to NEC/CEC, but just about all jurisdictions will specify the same.
Al.

[msdeltaguy]

With it wired up like stated below:
U=Pin 1
V=Pin 2
W=Pin 3

I just reconnected the earth ground to my table and when I hit run on the VFD i hear a pop from the spindle and the VFD goes into error for a few seconds and resets. when I disconnect the earth ground the spindle runs fine. Problem is im still getting set on fire when i touch my linear rails. its quite the shock

YES YES i know this is dangerous and thats why im on here trying to figure out what the heck is going on. I have double checked and my VFD is grounded to earth ground from the 220v AC circuit

[ericks]

What are the cable/wire colours to your spindle motor......the ones you had connected to U/V/W??

[msdeltaguy]

What are the cable/wire colours to your spindle motor......the ones you had connected to U/V/W??

I was called into work shortly after I woke so its going to be a while before I can perform the test. It will be later today but I will do as you have instructed and update the thread with the results

[ericks]

I was called into work shortly after I woke so its going to be a while before I can perform the test. It will be later today but I will do as you have instructed and update the thread with the results

No worries......a was also busy at work, talk later

[ericks]

Just to confirm....the spindle motor stays connected, only disconnect the cables U/V/W from the drive, you going to test these cables where they are disconnected. This way you testing from the start of the cable all the way to the motor and the motor itself.....all in one. ps......the fact that you heard a pop in the motor most likely is a sign that there is either a short, moisture or swopped cables/wires.