mvb8185

DriveLogix Powerflex 700S Motion Help

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Hello,

I have an interesting problem that no one in our company can really answer for me.  We are using Drive Logix with a powerflex 700S phase 2 drive and controlling a machine that rotates 360 degrees, sits for a moment, then return back to zero degrees.  We are using the MAM instruction to tell the drive to run the motor to its desired degree.  The problem we seem to face, is when they change jobs, the weight changes and we have to adjust speeds in order to get the machine to rotate back up to 360 degrees.  Otherwise, the motor stops short.  It usually never faults or alarms, it just stops short.  For example, they might run it and it will stop at 240 degrees or 315 degrees rather than the 360.  My question is, why doesn't the drive continue to push the motor to 360 degrees?  Why wouldn't the drive fault out on something like over current?  It seems that it just stalls and stops.  Sometimes, the machine will be running great, but on occasion (1 or 2 times a shift), the machine will stop short again.  I am curious what causes this and how I might be able to fix this to force the drive to continue to try and get to that desired degree.

Thank you for any help or input!

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Hi,

I have some questions for you:

Does the drive have an HMI installed?

Does it display a message like position error or something?

How do you put the system back to work? Recycle power?

Does the MAM instruction set the pc bit? error bit?

What type of feedback device do you use, absolute or incremental?

Is there a chance that coupling between the motor and the load slides?

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