Hi UR community,
I’m troubleshooting a UR10 CB3 with a recurring C71A52 error (current sensor test failure - sensors reported different currents when probed). On startup, it reports sensors detecting different currents, but after a few restarts (without cutting the power supply to the robot), it works normally. Initially, unplugging and replugging joint’s power cables resolved the issue for a couple of days, but the error returned.
I inspected the shoulder joints and surrounding joints and suspect an intermittent connection or power supply issue.
Context: The robot works around 8 hours daily and is powered down overnight. The error occurs on startup when the work day begins.
Steps taken:
- Unplugged and replugged shoulder joint cables (temporary fix).
- Inspected joint internals - no corrosion or damage
- Control box PSU looks fine
Questions:
- What specific steps should i take to diagnose this? Should i focus on the control box PSU, robot joint cables or control board?
- Has anyone encuntered this C71A52 error with simmilar intermittent behaviour? How did you resolve it?
Any advice or shared experiences whould be greatly appreciated!
Thanks in advance.
Do you have large temperature differences over night? Does it get really cold? Have you tried leaving it on overnight?
Temperature difference can be a factor, but there are 5 other UR robots in the same work cell and they don’t have simmilar issues. Althought this night was really cold, the robot powered on normally today, it’s random. Leaving it on overnight could help, but it’s just not feasible to constantly have one of the robots on for 16 hours a day and on weekends.
Your best bet is going to be to reach out to your distributor, or create a case with myUR and they will help diagnose things.
To the sentiment that it’s unfeasible to leave a robot on overnight… we have customers who run robots 3 shifts 7 days a week. Probably haven’t turned the robot off in a year. Granted, these are industrial robots, but I see no reason not to expect the UR to hold up to that standard.
I’m aware of that. What I meant was, it’s not feasible to convince my company to just leave one of the robots powered on while it’s not working (energy saving). I’m also aware they don’t actually take that much power. But still, It’d be better to get rid of the root cause of the problem than using this workaround.