Rockwell Automation 2090 Ultra3000 Servo Drives Integration Manual - Manual (Page 146)

Publication 2098-IN005C-EN-P — March 2008
146 Minimizing the Effects of Feedback Signal Loss
When configuring the fault actions to minimize unexpected motion,
you can select Shutdown or Disable Drive for the Position Error
attribute found in the Fault Actions tab of the Axis Properties dialog.
In the event of feedback signal loss, either of these settings will result
in the drive disabling and the axis coasting to a stop. Selecting the
Status Only or Stop Motion fault action causes the drive to simply
assert a fault indication, but motion continues when the feedback
signal is lost. Axis motion continues until the velocity error fault
condition is met, which may take some time. Therefore, selecting the
Status Only or Stop Motion fault actions is not recommended as an
effective Ultra3000 unexpected motion drive safety strategy.
RSLogix 5000 Axis Properties - Fault Actions Tab
TIP
The Feedback attribute found in the Fault Actions tab of the
Axis Properties dialog does not result in any action for the
Ultra3000 drive, regardless of the setting. The Feedback Noise
attribute does not result in any action due to a position or
velocity error fault and should be configured independently,
based on the application need.
ATTENTION
To avoid personal injury or damage to equipment due to
unexpected motion, the Position Error attribute found in the
Fault Actions tab of the Axis Properties dialog must be set to
Shutdown or Disable Drive. This results in the drive disabling
and the axis coasting to a stop. Further safety measures must
also be taken to make sure that, under worst-case conditions,
the coasting motion is brought to a safe stop by hardware
over-travel limits or other methods.