No, neither shielded or grounded.
I took a wire from metal casing of the motor plug back to the ground connection on the VFD but it made no difference. I’ve now got the capacitors but not yet fitted them.
Again this evening, I was running the facing job (800mm x 800mm) to take off 1mm of my workboard. It runs for 15 mins or so and seems to do fine but then just suddenly stops and ignores all further commands from grblControl. I have to power it off and back on to regain communication.
Can you post your $$ output from grbl here? Acts like you have hard limits turned on.
$$ < $0=10 (step pulse, usec)
$1=255 (step idle delay, msec)
$2=0 (step port invert mask:00000000)
$3=3 (dir port invert mask:00000011)
$4=0 (step enable invert, bool)
$5=0 (limit pins invert, bool)
$6=0 (probe pin invert, bool)
$10=3 (status report mask:00000011)
$11=0.020 (junction deviation, mm)
$12=0.002 (arc tolerance, mm)
$13=0 (report inches, bool)
$20=0 (soft limits, bool)
$21=0 (hard limits, bool)
$22=1 (homing cycle, bool)
$23=3 (homing dir invert mask:00000011)
$24=25.000 (homing feed, mm/min)
$25=750.000 (homing seek, mm/min)
$26=250 (homing debounce, msec)
$27=1.000 (homing pull-off, mm)
$30=12000. (rpm max)
$31=0. (rpm min)
$100=40.000 (x, step/mm)
$101=40.000 (y, step/mm)
$102=188.976 (z, step/mm)
$110=8000.000 (x max rate, mm/min)
$111=8000.000 (y max rate, mm/min)
$112=500.000 (z max rate, mm/min)
$120=500.000 (x accel, mm/sec^2)
$121=500.000 (y accel, mm/sec^2)
$122=50.000 (z accel, mm/sec^2)
$130=790.000 (x max travel, mm)
$131=790.000 (y max travel, mm)
$132=100.000 (z max travel, mm)
ok
That’s not a homing switch issue.
Does grblControl give you any status information, error code, or state information about grbl?
No. Just stops dead.
Sounds like this might be more relevant to your problem.
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eBay purchase.
It used to be OK and didn’t affect the X-Carve at all. The configuration hasn’t changed between it working and not working. I suspect a failing component in the VFD is causing noise.
Convinced it’s the VFD that’s gone on the blink so I’ve ordered a new one. If it doesn’t cure it I’ll have a spare 
Let us know how it goes.
If the new one fixes it I may have an idea of why the old one is failing.
Do you have a link for that VFD/Spindle?
Arghh!
Fitted the new VFD today and exactly the same problem. I set the X-Carve to go home and the moment I switch on the VFD it stops in its tracks. It stops even if I have the spindle disconnected. If I ignore the go-home problem and try to use it anyway the carves are all over the place. I tried it yesterday with the old VFD and it managed to crash into the Z switch each time and smash it into small bits.
My X-Carve is now pretty much unusable.
Just observed that if I send $H and then start the spindle S10000 is generated in grblControl
Thanks LarryM. I finally fitted the capacitors and now all is OK. Wish I’d tried your advice sooner rather than later as I now have a spare VFD.
Still very puzzled why it’s never missed a beat in the last 9 months and then suddenly needs capacitors. I hadn’t changed anything - not even the physical position of the VFD or X-Carve PSU.