Siemens SINUMERIK 840C Installation Instructions Manual page 256

12.93
448*
Default value
3
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*
Default value
50
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*
Default value
50
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*
Default value
4 000
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)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Minimum motor setpoint speed
Lower input limit Upper input limit
+0
Basic speed
Lower input limit Upper input limit
+0
Set oscillation speed
Lower input limit Upper input limit
1 000
+0
10 000
Maximum spindle speed
Lower input limit Upper input limit
+0
6FC5197- AA50
6.5 Spindle-specific MD (spindle data)
Units
16 000 rev/min
Units
99 999 rev/min
Units
2)
0.01 %
3)
Units
99 999 rev/min
Active on
NC Stop
1)
Active on
NC Stop
1)
Active on
NC Stop
Active on
NC Stop
1)
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