Effects On Path Acceleration; Substitute Characteristic Curve - Siemens SINUMERIK 828D Function Manual

4.2.20.2

Effects on path acceleration

Function
The path acceleration characteristic curve is generated on the basis of the types of characteristic for the axes
that are of relevance for the path. If axes with different types of characteristic curve are interpolated together, the
acceleration profile for the path acceleration will be determined on the basis of the reduction type that is most
restrictive.
The following order of priorities applies, whereby 1 = top priority:
1. Acceleration reduction: 0 = constant characteristic
2. Acceleration reduction: 1 = hyperbolic characteristic
3. Acceleration reduction: 2 = linear characteristic
4. No acceleration reduction effective
A situation, whereby no acceleration reduction is active, arises for example when:
MD35220 $MA_ACCEL_REDUCTION_SPEED_POINT = 1
and/or
MD35230 $MA_ACCEL_REDUCTION_FACTOR = 0
Note
Machine axes featuring stepper motor and DC drive can be interpolated together.
4.2.20.3

Substitute characteristic curve

Function
If the programmed path cannot be traversed using the parameterized acceleration characteristic curve (e.g.,
active kinematic transformation), a substitute characteristic curve is generated by reducing the dynamic limit
values. The dynamic limit values are calculated to ensure that the substitute characteristic curve provides the
best possible compromise between maximum velocity and constant acceleration.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
B2: Acceleration
4.2 Functions
249