Siemens SINUMERIK 840Di Function Manual page 249

The key data for the characteristic curves equate to:
v
max
v
red
a
max
a
red
2.18.1.2 Effect on the path acceleration
Key statement
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
Note
Machine axes featuring stepper motor and DC drive can be interpolated together.
Acceleration (B2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
= $MA_MAX_AX_VELO
= $MA_ACCEL_REDUCTION_SPEED_POINT * $MA_MAX_AX_VELO
= $MA_MAX_AX_ACCEL
= (1 - $MA_ACCEL_REDUCTION_FACTOR) * $MA_MAX_AX_ACCEL
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
2.18 Knee-shaped acceleration characteristic curve
Detailed Description
2-37