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About JumpStreet

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    Hi, I am New!

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  1. What is the point of a big "M1" contactor upstream of the drive then? It seems that one wouldn't need it at all. It seems that it would be most efficient to just wire directly from the branch circuit protection to the drive AC input power. 
  2. Hi all. I have a Kinetix 350 and an AB TLY servo motor. I'm using the drive's STO function. AC power is supplied into the drive, passing through an "M1" contactor. It makes sense to m e to keep that contactor open, preventing AC power to the drive, until the drive is fully awake.  Is that what you guys do? Someone suggested to me in another forum ( http://www.plctalk.net/qanda/showthread.php?t=121021&highlight=drive+awake ) that there is no reason not to supply power to the drive right away because the STO function is inhibiting power to the motor anyway. 
  3. Well, unfortunately this was never fully resolved. Here is what we found: Deleting the axis and starting from scratch did seem to stop the runaway problem. However, after adding a new axis and autotuning, the unloaded shaft still (about 1/2 the time) would drift and correct itself. It would bounce back and forth through an angle of about 30deg. When I rotated the shaft by hand, it would easily allow me to rotate it, and it would "cog" every 40 or 50 deg and sometimes not servo back to its original position. However, this was not repeatable, and it often would servo. One behavior that was repeatable, was that if we commanded it to jog forward it would sort of jump or cog in 50-60deg intervals. This could be smoothed out by increasing the system damping in the Manual Tuning parameters. Rockwell tech support agreed that it was behaving like it was single phasing, or not commutating. We tried a new drive, and saw the same exact behavior. For now, we aren't going to replace the motor or cables, because it seems to be managed by increasing the system damping (for example increasing damping from 1.0 to 0.7). Thanks to everyone for your help.
  4. Hi All, I have an AB servo TLY-A110T and 2097-V31PR0-LM Kinetix 350 drive. I thought that it was fully configured and ready for tuning, but when I issue a MSO it immediately starts to spin the shaft (no load yet). This lasts about a second until a Physical Axis Fault, Excessive Velocity Error occurs. I've double and triple checked the feedback and power wiring, and everything looks right. Is there anything else I can check? What can I do to trouble shoot this if I can't even give an MSO? Any insight is greatly appreciated.