Extension Of Dwell (Sw 5 And Higher); Corresponding Data - Siemens SINUMERIK 840C Installation Instructions Manual

09.95
12.4.2

Extension of dwell (SW 5 and higher)

12.4.2.1

Corresponding data

• NC MD 330 (Deadtime compensation for dwell with reference to the axis actual value)
• NC MD 332 (Deadtime compensation for dwell with reference to the axis setpoint)
• NC MD 333 (Deadtime compensation for dwell with reference to the spindle actual value)
• NC MD 334 (Deadtime compensation for dwell with reference to the spindle setpoint)
Following functions are implemented:
• Dwell at setpoint (G14)
• Dwell at any spindles (S1 to S6, at G14 and G24).
• Position-related dwell (G90) with overtravel direction (with G14 and G24 with
axes/spindles).
The different "dwell types" cause different deadtimes. For this reason, there are new machine
data for deadtime compensation (see above):
For description see Section 12.4.1 above.
Note:
During dwell in absolute positions (G90) the speed of the axis/spindle must not be larger than
D so that overtravel beyond the dwell position is reliably detected. If the speed is
max
greater/lower than D the dwell is terminated on the next IPO cycle.
max
D [rpm] < 30000 / (Tab[ms] * (1+K
max
Where:
Tab = IPO scan time in ms
K = Deadtime compensation value in %
dead
Example of standard machine data:
Tab = 16 ms, K = 450%:
dead
D < 30000 / (16 + (1+4,5)) rpm = 340 rpm
max
Note:
• The standard value for NC MD 330 has changed from 550 to 450 since SW 4.
• No zero offsets or tool offsets are included for the axes.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
12.4.2 Extension of dwell (SW 5 and higher)
[%] / 100)))
dead
6FC5197- AA50
12 Functional Descriptions
12–15