Noisy spindle, won't start sometimes.
This sounds like the same problem that I had when I first got my SX3. Sounded like the bearings were rough and sometimes I had to start the spindle by rotating it a slight amount by hand.
I talked to Syil America about it and they sent another motor and main board. Unfortunately, I had removed the origional motor before I had received the new one so I'm not sure if it was the motor or the main board. I suspect it was the main board that had a problem. However I changed both out and it has run smoothly and starts every time since I changed them both out.
OM
Testing Motor Control Board
juni117,
One of the things that I neglected to mention in my previous post was how I checked out my motor control board. Set the speed, in the manual mode, to a very slow speed, then grasp the spindle and stall it. Then slowly rotate it by hand. If the board is bad, you will find places in the rotation of the spindle that there will be no torque applied to the spindle from the board whatsoever. You can actually release the spindle when in one of these nulls and it won't move. I wouldn't leave it in this mode for too long a time but it is a way to check the board. If this is true in your case, it makes the motor sound rough when operating in normal operation.
I believe that this is the reason that the motor won't start sometimes when the control board is bad. If it should stop on one of the null points in the rotation, it won't start until the spindle is rotated a slight amount by hand.
I have plenty of electronic test equipment but sometimes trying the simple things first produces the same results.
OM