Siemens 611-D, 840C 12.4.2 Extension of dwell (SW 5 and higher) 12.4.2.1 Corresponding data

09.95 12 Functional Descriptions

12.4.2 Extension of dwell (SW 5 and higher)

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

Dmax so that overtravel beyond the dwell position is reliably detected. If the speed is

greater/lower than Dmax the dwell is terminated on the next IPO cycle.

Dmax[rpm] < 30000 / (Tab[ms] * (1+Kdead[%] / 100)))

Where:

Tab = IPO scan time in ms

Kdead = Deadtime compensation value in %

Example of standard machine data:

Tab = 16 ms, Kdead = 450%:

Dmax < 30000 / (16 + (1+4,5)) rpm = 340 rpm

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.

SINUMERIK 840C (IA)