Just curious, but does your design have a software or hardware limit switch for an e-stop function to avoid hitting an end stop? Guess virtual troubleshooting, kibitzing or whatever makes good mental excercise. Besides, it's the suburban substitute for the old sidewalk supervisors seen looking through cutouts in the fence around hi-rise projects.......
Darned machine designers; I have 10m of linear range and then they give me 25mm before I hit a dead-stop. 500LBs hurtling along at 70m/min. Dynamic braking can stop the motor dead but I might snap the motor shaft or wreck the transmission... can't win
That's likely related to the mode of failure. Maybe the end-stop shock gave that encoder a whack somehow.
T Chap,
It might be best to use a non-shaft-mount encoder so that you can then have an inline mechanical coupler to provide some shock absorption against these accidents. I know this'll be a pain to do but it might be worth it for reliability.
I am thinking this was a bad solder connection and vibration was affecting it. Apparently made during sleep deprivation! Barely in tact. I’ll re test the encoder next week. I’m just glad it wasn’t a repeat of the 7366 issue. Encoders never have problems on my systems so this was a fluke.
I vote mech shock, agree with the ratio being so far out. Maybe the sensors have shifted internally. Missing pulse makes me think fracture in the encoder disk, thin glass disks may not do so well with a sudden shock. Interesting to see back on the bench if the missing pulse is repeatable at the same shaft position. Oh, well, IO, IO, off to the salt mine I go......
Disc was fine. I missed the pulse overlap. But I noticed at the time the disc seemed a little lower in the slot that usually. The calibrate shim tool usually has the disc higher towards the top of the USDig E series. So it’s possible that sitting too low is affecting the overlap by some light angles etc. Not sure.
Comments
Darned machine designers; I have 10m of linear range and then they give me 25mm before I hit a dead-stop. 500LBs hurtling along at 70m/min. Dynamic braking can stop the motor dead but I might snap the motor shaft or wreck the transmission... can't win
However, that doesn't look like electronic damage, does it?
That's likely related to the mode of failure. Maybe the end-stop shock gave that encoder a whack somehow.
T Chap,
It might be best to use a non-shaft-mount encoder so that you can then have an inline mechanical coupler to provide some shock absorption against these accidents. I know this'll be a pain to do but it might be worth it for reliability.
+1