Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
115
Velocities, Setpoint/Actual Value Systems, Closed-
Loop Control (G2)
7
7.1 Velocities, traversing ranges, accuracies
7.1.1 Velocities
The maximum path/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
system (encoder limit frequency).
The maximum axis velocity is defined in MD32000 MAX_AX_VELO (maximum axis velocity).
The maximum permissible spindle speed is defined in MD35100 SPIND_VELO_LIMIT
(maximum spindle speed).
As well as limiting using MD32000 MAX_AX_VELO, the control limits the maximum path
velocity in relation to the situation and according to the following formula:
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9
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With a higher feedrate (resulting from program and affected by feed 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 = 10,606.6 mm/s = 636.39 m/min
The following restriction applies to the minimum path or axis velocity:
9
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LQFU
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>@
,32F\FOH>V@
The computational resolution is defined via MD10200 INT_INCR_PER_MM (computational
resolution for linear positions) or MD10210 INT_INCR_PER_DEG (computational resolution
for angular positions). It is described in more detail on the pages that follow.
If V
min
is not reached, traversing is not carried out.
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