We have a VF3 with coolant through the spindle and have been having issues with a hum from behind the spindle head with an unclamp alarm. I replaced the pre-charge solenoid and cleaned things up about three weeks ago and the machine was fine for a while until the second solenoid went bad and now we are getting the same problem a hum and tool unclamp alarm. Can the I/O board be bad? What else can I do to figure out the root cause?
When I disconnect the pre-charge solenoid the machine tool unclamp alarm clears but then we get another alarm TSC pre-charge failure. Might not be a good Idea but can we bypass the pressure switch just to get a job done thats on the machine now?