Siemens Sinumerik 840DiE sl - Velocities

01/2007
11.3 System data
11-305
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
11.3.9 Velocities
The maximum possible axis velocities and spindle speeds depend on the ma-
chine design, drive dynamics and the encoder limit frequency of the individual
drives.
The maximum programmable tool path velocity results from the maximum axis
velocities of the axes involved in the path programmed.
The maximum tool path velocity at which traversing is possible within a part
program block results as follows:
V
max

progr. path length in the part program block [mm or degrees]
IPO cycle [s]
To guarantee that part program blocks are executed continuously (control mar-
gin), the NCK limits the tool path velocity within a part program block to 90% of
the max. possible tool path velocity as follows:
V
max

progr. path length in the part program block [mm or degrees]
IPO cycle [s]
*0.9
For example, in the case of part programs generated by means of CAD system,
which contain extremely short blocks, this limiting of the path velocity can result
in a strong reduction of the path velocity over several part program blocks.
The function ”Online compressor” can help to avoid such sudden velocity dips.
References: /PGA/ Programming Guide, Advanced
Section: Compressor COMPON/COMPCURVE
The minimum tool path or axis velocity at which traversing is possible results from:
V
min

10
3
calculation precision[
incr.
mm or degrees
] * IPO cycle [s]
(for the computational resolution, see: Section 11.3.1, Page 11-292)
If V
min
is not reached, no traversing movement is carried out.
/FB/ Description of Functions, Basic Functions
G2 Velocities, Traversing Ranges, Accuracies
Section: Velocities
Max. axis velocity
or spindle speed
Max. progr.
path velocity
Max. tool path
velocity
Upper limit
Lower limit
References
11 NCK Commissionin
g
with HMI Advanced