We recently purchased a second-hand i7 robot. After starting it up and attempting to home all the axes, we encountered the error: *“Error homing: A light curtain violation has occurred.”
We double-checked to ensure the light curtains weren’t activated or triggered by any objects, and even swapped out some of the light curtain modules, but the error persists. After consulting with Beckman, we learned that the error message is misleading, and the actual cause could be a variety of issues with the robot.
Has anyone encountered this problem and successfully resolved it without requiring a service engineer on-site?
I’ve personally only seen errors of that type in four conditions.
Light curtain triggered by user
Fast-stop/abort triggered in such a way that homing a gripper leads to never-ending light curtain trigger
improper initialization
failure to resume light curtain after pausing via commands within script.
You could maybe try isolating the problem, like by copying the instrument file to a 2nd computer and see if you can simulate the instrument? At least you could confirm hardware vs software issue in that manner.
@Evoboy Can you try covering the light curtain with black tape and see if the error goes away? If it does not, it means that there is another issue going on. If you would like, we service the i-Series instruments. you can reach out to service@dcmbio.com
Hi! Thank you so much for this information. We recently encountered the same problem. The light curtain violation just never clears and it shows up even when we tried to home the instrument. We suspected it is due to the second reason you described because we had a method that has a user pause step, and we had a student chose to abort the method at this step for a few times. And after that this message shows up. Do you know what we can do? We tried to reboot everything but it didn’t seem to help. Any insight will be helpful! Thank you so much!