Siemens SINUMERIK 828D Function Manual

B2: Acceleration
4.2 Functions
Basic Functions
226 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
4.2.7 Path acceleration for real-time events (channel-specific)
4.2.7.1 General Information
General Information
So that no compromise has to be made between machining-optimized acceleration on the one hand and time-
optimized acceleration in connection with the following real-time events on the other:
• NC-STOP / NC-START
• Changing the feedrate override
• Changing the velocity default for "safely reduced velocity" within the context of the "Safety Integrated" function
for the real-time events mentioned, the path acceleration can be specified using a channel-specific system
variable:
$AC_PATHACC =
path acceleration
Real-time event acceleration will only be active for the duration of the change in velocity in respect of one of the
real-time events specified above.
Limiting
If the specified path acceleration exceeds the capabilities of the machine axes that are of relevance for the path,
a limit will be imposed on the path acceleration within the control so that the resulting axial acceleration (a
res
) is
restricted to less than 2x the parameterized maximum axial value (a
max
).
a
res
= 2 * a
max,
with a
max
= MD32300 $MA_MAX_AX_ACCEL
Effectiveness
Note
Real-time-event path acceleration is enabled, irrespective of the radial acceleration.
Effective Real-time event acceleration is only enabled in AUTOMATIC and MDA operating
modes in conjunction with the following real-time events:
• NC-STOP / NC-START
• Override changes
• Changing the velocity default for "safely reduced velocity" within the context of the
"Safety Integrated" function
Not effective Path acceleration for real-time events is ineffective for changes in path velocity that are
attributable to path planning during preprocessing for the channel, such as contour
curvatures, corners, kinematic transformation limitations, etc.
Real-time-event path acceleration is ineffective if the programmed value is smaller
than the path acceleration calculated during preprocessing for the path section
concerned.

Siemens SINUMERIK 828D Specifications

General

Brand	Siemens
Model	SINUMERIK 828D
Category	Control Systems
Language	English