Problem
This troubleshooting article applies only to post 2020 machines
If the machine is not operating and the” information light” at the rear status panel of the machine and the firmware LED on the logic board flashes with the following eight-bit pattern as described here:
0000 1111 x-axis
0001 0000 y-axis
0001 0001 z-axis
Where 0 indicates a short pulse which is 1/4 second and 1 indicates a long pulse which is 1 second long.
This error results from a significant difference between rotary encoder and linear encoder of an axis. This error can occur on all three axis but the debugging procedure is always the same.
Solution
The following items provide step by step instructions on how to break down the cause of the issue:
This can easily occur if the drives are adjusted or replaced, because the ratio between the encoders needs to be calibrated. Recalibrate the volume to measure the ratio.
Check that the drive is mechanically aligned, smooth, no slop/slipping etc.
If the fault is occurring on an Excel xy-axis during long, high speed moves, the most likely mechanical cause is incorrect preload on the capstan idler bearing.
If the fault is occurring on an Excel xy-axis during long, low speed moves, the most likely mechanical cause is band misalignment.
If the fault is occurring on a Vertex machine or a z-axis, there is an egregious drive issue, unless it is an electrical issue. Check for axial play in the lead screw or the coupling.
Check all the encoders, encoder interpolators, and encoder cables.
