G2: Velocities, setpoint / actual value systems, closed-loop control
7.2 Velocities, traversing ranges, accuracies
Basic Functions
330 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
7.2 Velocities, traversing ranges, accuracies
7.2.1 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 an explanation, please refer to:
References:
/FB1/ Function Manual Basic Functions; Spindles (S1)
With a high feedrate (resulting from programmed feedrates and feedrate override), the maximum path velocity is
limited to V
max
.
This automatic feedrate limiting can lead to a drop in velocity over several blocks with programs generated by
CAD systems with extremely short blocks.
Example:
Interpolation cycle = 12 ms
N10 G0 X0 Y0; [mm]
N20 G0 X100 Y100; [mm]
⇒ Path length programmed in block = 141.42 mm
⇒ V
max
= (141.42 mm/12 ms)
*
0.9 = 10606.6 mm/s = 636.39 m/min
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