Spindle dead or vfd dead and how to tell.

[m_c]

Seems strange that the VFD isn't generating any kind of error message.

First thing would be disconnect the spindle power wires from the VFD, then measure for continuity between them in pairs, and check for continuity between the pairs and earth/gnd.
The three pair combinations should have quite similar values. Any high resistance measurement would indicate a broken wire, or a failed spindle, so you'd need to re-measure directly at the spindle.
And any continuity between those wires and gnd would indicate an insulation failure somewhere. Again, you'd need to re-measure at the spindle.

Failing that, swapping parts out is the easiest option.

[Ollie78]

Hi m_c

Thanks for replying to my question, I managed to spare half an hour today to investigate a little bit.
I have done a few continuity tests, I was surprised to find only 3 pins in the top connector of the spindle, I am assuming the earth is via the shielding ?

So the wires at the VFD are the earth which is to a common plate with the input power, U2,V2 and W2 .

With the spindle still connected I tested the terminals with each other, all beeped indicating continuity and showed a reading of 1.6 to 2 ohms on the multimeter.
I then disconnected the wire at the top of the motor and tested continuity between each of the 3 pins in the motor all beeped and showed 1.6 ohms.

Then I tested each section of the plug with its counterpart on the vfd and they all beeped continuity and showed 00.3 to 00.5 ohms.
There did not appear to be any continuity between ground and anything else.

I am not sure what this is indicating really and am none the wiser.

There is no error message on the vfd, the screen comes on as normal and just reads 0, when switched to spindle on nothing changes, still 0.

I am thinking I will need to test the vfd when powered on to see what is happenning but not sure what setting on the multimeter etc.
Be handy if I had a spare of either to eliminate one or the other.

Ollie