Parameterization - Siemens SINUMERIK 828D Function Manual

B2: Acceleration
4.2 Functions
1: Characteristic with constant travel time
2: Characteristic without constant travel time
a : Maximum acceleration value
max
v : Maximum velocity value
max
t: Time
Figure 4-2 Schematic for abrupt acceleration
The effect of the constant travel time can be seen from the figure above:
• Time: t
1
End of acceleration phase with sudden acceleration 1 * a
• Interval: t - t
1 2
Acceleration 0; constant velocity using the parameterized constant travel time
• Time: t
2
Start of braking phase with sudden acceleration 1 * a
The times t , t ' and t ' indicate the characteristic that would have been produced had no constant travel time
0 1 2
been defined.
4.2.3.2

Parameterization

The constant travel time is parameterized for specific channels using machine data:
MD20500 $MC_CONST_VELO_MIN_TIME
(minimum time with constant velocity)
222
max
max
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions