text: <s>[INST] Sercos Ring Fault FYI Experienced a sercos ring fault on a 21 axis machine. After hours of troubleshooting found that an input to axis 19 was intermittently shorting. When this power is shorted it causes the whole drive to shutdown/power down, which then makes it look like a Sercos Fault. There was no indication of a grounded input. By luck we happened to see this drive physically shut off first. I disconnected the I/O connector and ran w/o it for a short while and had no issues.For the final fix I replaced the shorted cable and installed illuminated fuse holder in-line w/ the 24V out of the drive. Then split out of the fuse holder to the prox and a solid state relay. I then used the relay to send an input to the PLC incase this should happen again for HMI indication. [/INST] Good information to have, but what was the drive type, K6K, K2K, U3K,...? \\n </s>