Siemens SINUMERIK 810D

Functions
2.2 Constant travel time (channel-specific)
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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2.2 Constant travel time (channel-specific)
2.2.1 Detailed Description
2.2.1.1 General Information
Overview
In the case of acceleration without jerk limitation, sudden acceleration of 2 * a
max
occurs on
switchover between acceleration and braking. In order to avoid this sudden acceleration, a
channel-specific constant travel time can be programmed. The constant travel time defines
the time taken to traverse between the acceleration and braking phases at constant velocity:
MD20500 $MC_CONST_VELO_MIN_TIME (minimum time with constant velocity)
Note
The constant travel time is ineffective:
• Active function: Look Ahead
• In traversing blocks with a travel time that is less or equal to the interpolation cycle time.
WW
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W WWW
D
PD[
D
D
PD[
Y
PD[
W
W
Y
Figure 2-2 Schematic for abrupt acceleration