Siemens SINUMERIK 840D Function Manual page 384

B2: Acceleration and jerk
12.2 Functions
Parameter assignment
The following machine data is relevant for parameterizing the axis-specific acceleration
characteristic curve above the configured velocity limit:
● MD32000 $MA_MAX_AX_VELO (maximum axis velocity)
● MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT = <speed limit>
From the parameterized velocity, the reduced acceleration is in effect>
● MD35230 $MA_ACCEL_REDUCTION_FACTOR = <reduction factor>
Beyond the reduction speed, interpolation between the maximum and minimum
acceleration occurs up to the maximum speed. The minimum acceleration is calculated as:
minimum acceleration = maximum acceleration * (1 - reduction factor)
● MD35242 $MA_ACCEL_REDUCTION_TYPE (see paragraph below: "Selection of the
torque characteristic curve")
● MD32300 $MA_MAX_AX_ACCEL (Maximum axis acceleration)
Selection of the torque characteristic curve
The following characteristic curve types can be selected for the reducing range via the machine
data as a controller-internal emulation of the torque characteristic curve of the motor:
MD35242 $MA_ACCEL_REDUCTION_TYPE = <value>
Value Meaning
0 Constant torque characteristic
1 Hyperbolic torque characteristic
2 Linear torque characteristic
384
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA