Siemens SINUMERIK 840C - Manual (Page 256)

12.93 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.5 Spindle-specific MD (spindle data)
Minimum motor setpoint speed 448*
Default value Lower input limit Upper input limit Units
3 +0 16 000 rev/min 1)
Active on
NC Stop
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.
Basic speed 449*
Default value Lower input limit Upper input limit Units
50 +0 99 999 rev/min 1)
Active on
NC Stop
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.
Set oscillation speed 450*
Default value Lower input limit Upper input limit Units
50 +0
1 000 2)
10 000 3)
0.01 %
Active on
NC Stop
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).
Maximum spindle speed 451*
Default value Lower input limit Upper input limit Units
4 000 +0 99 999 rev/min 1)
Active on
NC Stop
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 6FC5197- AA50 6–71
SINUMERIK 840C (IA)