The first problem:
- the y axis doesn't work correctly. During the working cycle the program stops giving the message: stuck y
I've made these controls:
- I've swapped the stepper between the x and y axis
- I've swapped the motor/encoder between the x and y axis
- I've disconnected (only from a mechanical point of view) the y motor/encoder from the machine in order to verify if it is a mechanical problem
- the stop happens always when the y axis runs towards the rear of the machine
- the stop happens during the cycle: sometimes the machine makes 1, 2, 3 operations on the y axis and then stops
- the display on the APU unit during the stop makes a bad signalling on the LED 8, lighting in sequence 1 bar after each other representing a zero character
- I've made the test cycle checking
- checksum: A and B are ok. C: I've not found the EPROM with the reference value on the APU board
- motor check: ok
- initialization: ok (in the working condition and also after x and z driver disconnect)
Now the spindle, after some working hours, doesn’t stop and the machine seems to be in a waiting condition: in this case it’s necessary to power-off the machine. At the subsequent power-on and initialization the spindle doesn’t stop and we have to wait for the next day: it seems like an overheating of some component inside.
I’ve also analyzed (with a Tk oscilloscope) wave forms on the
- ext reset
- write
pin of y stepper. During the analysis I noticed that the “stuck y” error disappears: otherwise, changing the working program, the x and y steppers goes in error. The same result has been obtained connecting the “write” pin with the “GND” pin of the y stepper with a 1Mohm resistor.
In my opinion the cause of problems may reside into the
APU pn. DM 4X00 REV.3
Board.
Is there someone how is able to help me in repairing my machine?
Is there someone how owns an APU card to sell me?
Thank you very much for helping.
Giorgio Landi – Milan – Italy
:cheers::cheers: