G2: Velocities, Setpoint / Actual Value Systems, Closed-Loop Control; Brief Description; Velocities, Traversing Ranges, Accuracies; Velocities - Siemens SINUMERIK 840D Function Manual

G2: Velocities, setpoint / actual value systems, closed-
loop control
2.1

Brief description

The description of functions explains how to parameterize a machine axis in relation to:
● Actual-value/measuring systems
● Setpoint system
● Operating accuracy
● Travel ranges
● Axis velocities
● Control parameters
2.2

Velocities, traversing ranges, accuracies

2.2.1

Velocities

Maximum path and axis velocities and spindle speed
The maximum path and axis velocities and spindle speed are influenced by the machine
design, the dynamic response of the drive and the limit frequency of the actual-value acquisition
(encoder limit frequency).
The maximum axis velocity is defined in machine data:
MD32000 $MA_MAX_AX_VELO (maximum axis velocity)
The maximum permissible spindle speed is specified using machine data:
MD35100 $MA_SPIND_VELO_LIMIT (maximum spindle speed)
For explanations, see Section "S1: Spindles (Page 733)".
With a higher feedrate (resulting from programmed feedrates and feedrate override), the
velocity is limited to V
This automatic feedrate limiting can lead to a drop in velocity over several blocks with programs
generated by CAD systems with extremely short blocks.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
.
max
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