Siemens SINUMERIK 840C - Manual (Page 210)

09.95 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.2 General machine data (general data)
Deadtime compensation for dwell referred to axis
Actual value (SW 4 and higher)
330
Default value Lower input limit Upper input limit Units
550 0 16 000
in % of the IPO
cycle
Active on
NC Stop
Sine of angular range for tangential transitions TRC 331
Default value Lower input limit Upper input limit Units
2
( ˆ =appr. 0.0005 degr.)
1
( ˆ =appr. 0.0003 degr.)
16 000
( ˆ =approx. 4.5 degr.)
0.5x10 -5
Active on
NC Stop
This MD defines which angular range the tool radius compensation recognizes as the
tangential transition (180° ± MD 331). No intermediate blocks are inserted with tangential
transitions.
Deadtime compensation for dwell referred
to axis setpoint (SW 5 and higher)
332
Default value Lower input limit Upper input limit Units
450 0 16 000
in % of the IPO
cycle
Active on
NC Stop
Deadtime compensation for dwell referred to
spindle actual value (SW 5 and higher)
333
Default value Lower input limit Upper input limit Units
550 0 16 000
in % of the IPO
cycle
Active on
NC Stop
Deadtime compensation for dwell referred
to spindle setpoint (SW 5 and higher)
334
Default value Lower input limit Upper input limit Units
450 0 16 000
in % of the IPO
cycle
Active on
NC Stop
With the ”Dwell referred to an axis” (G24), a time corresponding to the machine data above is
compensated statically. This data is used to observe the internal execution times in the control.
If the value is 0, there is no deadtime compensation.
With dwell on absolute position (G90) the speed of the axis/spindle must not become
greater than Dmax, so that overtravel of the dwell position is recognized reliably.
If the speed is greater than or equal to D
max
, dwell is terminated in the next IPO cycle.
D
max
[rpm]<30000/(Tab[ms]*(1+K
dead
[%]/100)))
Tab: IPO sampling time in ms
K
dead
: Deadtime compensation value in %
Example of standard machine data:
Tab = 16 ms, K
dead
= 450%:
D
max
< 30000/(16 *(1+4.5)) rpm = 340 rpm
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–25
SINUMERIK 840C (IA)