Technical data

Drive functions
7.3 Function modules
Function Manual
Function Manual, 06/2012, 6SL3097-4AB10-0BP4
239
Jerk limitation
Acceleration and deceleration can change suddenly if jerk limiting has not been activated.
The diagram below shows the traversing profile when jerk limitation has not been activated.
The diagram shows that maximum acceleration (a
max
) and deceleration (d
max
) are effective
immediately. The drive accelerates until the target speed (v
target
) is reached and then
switches to the constant velocity phase.
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Figure 7-49 Without jerk limitation
Jerk limitation can be used to achieve a ramp-like change of both variables, which ensures
"smooth" acceleration and braking as shown in the diagram below. Ideally, acceleration and
deceleration should be linear.
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Figure 7-50 Activated jerk limitation
The maximum inclination (r
k
) can be set in parameter p2574 ("Jerk limitation") in the unit
LU/s
3
for both acceleration and braking. The resolution is 1000 LU/s
3
. To activate limiting
permanently, set parameter p2575 ("Active jerk limitation") to 1. In this case, limitation
cannot be activated or deactivated in traversing block mode by means of the command
"JERK" as this would require parameter p2575 ("Activate jerk limitation") to be set to zero.
The status signal r2684.6 ("Jerk limitation active") indicates whether or not jerk limitation is
active.