Temperamental spindle

[mark84]

Hi gentlemen,
thanks for all the posts.
Apologies for me taking my time, I've used the router a few times since last post, and all seemed well, until today- when it's back with a vengeance.
It took four attempts but the spindle came to life, however it stopped- without cause after 2 mins.

Once again I'm having to wait- I believe this may be a clue to the issue- the fact I have to wait several hours until the spindle will run again. This is the original VFD, installed by dean. routerCNC, in regards to your question about the behaviour of the spindle when FOR and DCM were connected, technically it didn't power the spindle up- however, I would say it was successful as it made a 'click' - something the VFD has always done- Dean told me this was something in the VFD to do with acceleration, and from day 1 it's always been a little coy at starting up at very slow (sub 6krpm) or very fast (over 20k) speeds, usually taking a few attempts, though it's never been a big deal. I assume short circuiting it in that way makes it power up to full speed, at which point it does what it would have always done, and clicks(think this click would be a MCB?) and prevents the spindle from running.
This isn't what is happening at the moment- I hit the spindle button on mach3 and it's totally unresponsive, the VFD sits there happily blinking away, no MCB noise, no power to the spindle.
I know it's a bit confusing, hope I've at least done an ok job of explaining it :(