800w spindle - noise & controlling remotely

[HankMcSpank]

I really do appreciate your help (Eddy I'd already done your suggestion - to no avail).

I've continuity between all phases (3.5 Ohms...which seems to be about right)...I have no shorts to ground. I've also checked from the wiring (at the VFD end) with the spindle cable plugged in at the spindle end - checking for continuity & making sure there are no shorts...I'm pretty confident it's not the wiring. I've tried a coupole of permutations of connections to the spindle (one permutation the spindle tuned the wrong way...as expected)

My gut feeling is that it's still the spindle...on account of the noise it wheezes out even when turning very slowly & the fact that the spindle casing gets fairly warm even at the very slow turning I can coax it to do before it trips.

silyavski ...I've revisit this again with your last input in mind. Re the V/F setting...I turned it down to 50V (figuring I = V/R) to see if I could get the rotation higher before it trips, but it still trips out at about 2.9Hz.

Apparently this spindle has sat around unused for a considerable length of time (but was previously used a lot without incident)...I can't see how it sitting around on a shelf would cause a VFD to trip though.

Anyway thanks once again :-) (I actually submitted a best offer on a new 800W spindle 48hrs ago which has now just expired - that would have proved one way or the other!)