Re: Scary VM10U problems
Originally Posted by
Green0
Problem came back, the machine is down more than it's up. Now most recently the cutting is pushing the C axis around and it's losing the encoder position. That doesn't make any sense to me. The encoder shouldn't ever lose position- from what I understand it is a glass scale and it should always know where the table is even if the table moves in an undesirable manner (the servo and the encoder have different responsibilities- the servo to move the table, and the encoder to know at all times where the table is).
The C is being pushed enough to trip the parameter and stop cutting, and re-zeroing isn't returning the table to the same position.
I would say that there is a mechanical disconnect between the encoder and the table, or the encoder and/or wiring is defective and there is noise on the line. I guess the problem could also be the encoder counter on the controller.
I would expect the axis to trip out (thus shutting down the machine) on an excess position error, but it should not lose the table position unless the encoder signal is not properly getting to the controller or is mechanically slipping.
Jim Dawson
Sandy, Oregon, USA