Constant Travel Time (Channel-Specific); General Information - Siemens SINUMERIK 840D sl Function Manual

B2: Acceleration
5.2 Functions
Function
The BRISKA part-program command is used to select the "without jerk limitation" acceleration
profile for single-axis movements (JOG, JOG/INC, positioning axis, reciprocating axis, etc.).
G group: -
Effectiveness: Modal
Axis:
● Value range: Axis name of the channel axes
Axis-specific initial setting
Acceleration without jerk limitation can be set as the axis-specific initial setting for single-axis
movements:
MD32420 $MA_JOG_AND_POS_JERK_ENABLE = FALSE
Reset behavior
The axis-specific initial setting is activated via a reset:
MD32420 $MA_JOG_AND_POS_ENABLE
5.2.2

Constant travel time (channel-specific)

5.2.2.1

General Information

Overview
In the case of acceleration without jerk limitation, sudden acceleration of 2 * a
switchover between acceleration and braking. In order to avoid this sudden acceleration, a
channel-specific constant travel time can be programmed. The constant travel time defines
the time taken to traverse between the acceleration and braking phases at constant velocity:
MD20500 $MC_CONST_VELO_MIN_TIME (minimum time with constant velocity)
Note
The constant travel time is ineffective:
● Active function: Look Ahead
● In traversing blocks with a travel time that is less or equal to the interpolation cycle time.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
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Basic Functions