Siemens SINUMERIK 840C Installation Instructions Manual page 256

12.93
448*
NC MD 448* defines the minimum spindle speed. The motor does not fall below this speed, for
example, even when the cutting speed is constant and the turning diameter increases. In other
words, when the motor reaches the minimum speed defined here, the cutting speed is no
longer constant but increases with the turning diameter. Concentric running of the spindle is
possible up to this minimum speed.
449*
If the PLC activates the "Basic speed" signal (DB31 DRk + 2, bit 5) and switches over to
PLC spindle control, a spindle setpoint corresponding to this spindle speed is output, taking
into account the gear just selected. Spindle override is active.
450*
So that you can set the oscillation speed as finely as possible, you enter it in 0.01% of the
maximum motor speed, i.e. 10000 (previously 8192) is oscillation at maximum motor speed.
Note
The selection of an oscillating speed does not in itself result in oscillation. This must be
brought about with "Set direction of rotation clockwise/counter-clockwise" (DB31 DRk + 2,
bit 7).
451*
The "Speed limit exceeded" signal and alarm 225* are generated when the maximum spindle
speed defined here is exceeded by more than the tolerance limit specified in NC MD 445*.
_______
1) The input resolution is 0.1 rev/min, if MD 520* bit 3=1.
2) Up to SW 2
3) As from SW 3
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
More user manuals on
Minimum motor setpoint speed
Default value Lower input limit
3
Default value Lower input limit
50
Default value Lower input limit
50
Default value Lower input limit
4 000
ManualsBase.com
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Upper input limit
+0 16 000
Basic speed
Upper input limit
+0 99 999
Set oscillation speed
Upper input limit
1 000
+0
10 000
Maximum spindle speed
Upper input limit
+0 99 999
6FC5197- AA50
6.5 Spindle-specific MD (spindle data)
Active on
NC Stop
Units
1)
rev/min
Active on
NC Stop
Units
1)
rev/min
Active on
NC Stop
Units
2)
0.01 %
3)
Active on
NC Stop
Units
1)
rev/min
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