Unexpected behavior when processing jerk specifications

The described time-based operating modes absolute positioning mode (Positioning), cam positioning mode, jog mode (Jog), cam jog mode, referencing mode (Homing), energy-optimized XY positioning effiDRIVE^® and mechanically optimized positioning make it possible to control the jerk directly using the lrJerk variable. Scenarios are described in this chapter with which unexpected behavior of the axis concerned can occur, particularly when changing over from a large jerk to a small jerk during certain phases of the movement. More information about limiting the setpoints and calculating the maximum jerk can be found in chapter Setpoint limitation.

NOTICE

Unexpected system behavior when reversing the drive, particularly when changing over from a large jerk to a small jerk during certain phases of the movement. The user is responsible for ensuring that the control configured for profile generation does not result in unexpected behavior.

Death, severe injuries, damage to property

• Check the effects that unexpected reversing of the drive would have in your application. To prevent unexpected reversing of the drive, treat the specified jerk like a uniquely configured parameter or only change it if the currently effective acceleration is approximately "0".

• Example 1
• Example 2
• Example 3
• Axis 4 (virtual axis)
• Explanation