Siemens SINAMICS S120 Function Manual page 459

Figure 7-16
The maximum gradient (r
for both acceleration and braking. The resolution is 1000 LU/s
permanently, set parameter p2575 (Activate jerk limitation) to 1. In this case, limitation
cannot be activated or deactivated in traversing block mode by means of the command
"JERK". Switching the limitation on/off in the traversing block mode requires 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.
The limitation is effective for the following activities:
● Jog mode
● Processing traversing blocks
● Direct setpoint specification / MDI for positioning and setting up
● Reference point approach
● Stop responses due to alarms
Jerk limitation is not active when messages are generated with stop responses OFF1 / OFF2
/ OFF3.
Starting against a closed brake
Under EPOS, if the drive should start against a closed brake, for example, for a suspended
load, then the enable signal p0899.2 is briefly withdrawn. The drive pulses are canceled and
fault F07490 is output.
To avoid this happening, using p1513 activate a supplementary torque which corresponds to
the brake holding torque. As a result, after releasing the brake, the load cannot sag and the
drive remains in closed-loop control without fault F07490 being output.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Activated jerk limitation
) can be set in parameter p2574 (jerk limitation) in the unit LU/s
k
Function modules
7.8 Basic positioner
. To activate the limitation
3
3
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