800w spindle - noise & controlling remotely

[JAZZCNC]

So, something arrived in the post today, from Italy ...

Great so is it running yet.? . . . . If not why not. . . . . .Think you'll like it.!!

[Boyan Silyavski]

A bit more heads up:

The Speed and corresponding frequencies in HZ, measured carefully with a device, you r can be slightly different but not so much. Open it in new window to see it better and enlarge it with "control" + "+" , or PM if you can not read it:





The typical connection / check well the manual/

cables from left to right
- trip ,
- PWM control,
- ??? i forgot , not so sure, but it was enable to the BOB, in case of power loss it stops everything/

[EddyCurrent]

Looks like section 6.18.3 shows how to configure the display to show motor speed.

[HankMcSpank]

Great so is it running yet.? . . . . If not why not. . . . . .Think you'll like it.!!

Unfortunately I'm not going to get a chance to wire it up for a little while yet (probably some time over the weekend)....got to think this one through & decide just how 'integrated' (wiring wise, remote control, speed control etc) I want to make it for my present or predicted method of working.

I'm figuring most folks have their VFD actually mounted near the machine?

The non-working machine I bought had its VFD tucked away in the 'enclosed' control box (well that is, before the VFD stopped working & they removed it!)

[JAZZCNC]

I'm figuring most folks have their VFD actually mounted near the machine?

The non-working machine I bought had its VFD tucked away in the 'enclosed' control box (well that is, before the VFD stopped working & they removed it!)

I prefer to have it near machine so can see the Amp's it's pulling while cutting. I set the RPM then display Amps and just have Start/Stop under machine control.

[HankMcSpank]

Oh dear....what is it about the CNC genre?!!!

So I've just hooked up my new VFD to my 800W spindle - the VFD is tripping outwith an overload condition.

I'm figuring it's likely to be the spindle becuase it's of unknown status. I bought the CNC machine in a "needs putting back together" condition ...with a VFD missing. I'm now assuming that a spindle fault perhaps took out the original VFD?

I'm controlling the spindle speed manually with a 10k pot that I've connected up to the VFD, I can get the spindle to turn very, very slowly (without tripping) with the pot at its lowest speed setting but if I turn the pot just a degree or two the VFD goes into an error condition 'overload'....I've checked the VFD settings for tripping out (they're all at default...and nothing seems untoward there)

I don't suppose it's easy to test these water cooled spindles? (I'm seeing just a couple of ohms between pins ...also when the spindle is turning even ridiculously slow, the spindle outer chassis gets warm (not ouch warm, but warm...which is surprising bearing in mind it's turning very slowly ....like 60RPM or so)

Any ideas?

[Jonathan]

VFD will trip on over current or over voltage. If the spindle is getting hot with no load, that means the current is too high. For there to be too high a current the voltage the VFD is applying must be too high (ohms law), so check what the voltage is at rpm.

The vfd, when using vf control, should increase the voltage proportional to the frequency, so (generally) rated voltage at rated speed, half voltage at half speed etc.. What might be happening is the voltage/frequency curve is set wrong, so it's applying much too high a voltage, which in turn causes too much current to flow, so the VFD trips.