Parameterization; Acceleration Margin For Radial Acceleration (Channel-Specific); General Information - Siemens SINUMERIK 828D Function Manual

B2: Acceleration
4.2 Functions
4.2.10.2

Parameterization

Excessive acceleration for non-tangential block transitions is parameterized using the axis-specific machine data:
MD32310 $MA_MAX_ACCEL_OVL_FACTOR
(overload factor for velocity jumps)
4.2.11

Acceleration margin for radial acceleration (channel-specific)

4.2.11.1

General Information

Overview
In addition to the path acceleration (tangential acceleration), radial acceleration also has an effect on curved
contours. If this is not taken into account during parameterization of the path parameters, the effective axial
acceleration during acceleration and deceleration on the curved contour can, for a short time, reach 2x the
maximum value.
Effective axial acceleration =
Path acceleration + radial acceleration =
2 * ( MD32300 $MA_MAX_AX_ACCEL )
Figure 4-3 Radial and path acceleration on curved contours
The channel-specific machine data:
MD20602 $MC_CURV_EFFECT_ON_PATH_ACCEL
(influence of path curvature on dynamic path response)
can be used to set the proportion of the axis-specific acceleration that is to be taken into account for radial
acceleration.
When, for example, a value of 0.75 is applied, 75% of the axis-specific acceleration will be made available for
radial acceleration and 25% for path acceleration.
The corresponding maximum values are generally calculated as follows:
Radial acceleration =
MD20602 $MC_CURV_EFFECT_ON_PATH_ACCEL * MD32300 $MA_MAX_AX_ACCEL
230
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions