Siemens SINUMERIK 828D Function Manual page 1392

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V1: Feedrates

17.4 Feedrate control

For gray-coding, the override factors corresponding to the switch position should be entered in the machine data:

MD12030 $MN_OVR_FACTOR_FEEDRATE (evaluation of the path feedrate override switch)

MD12050 $MN_OVR_FACTOR_RAPID_TRA (evaluation of the rapid traverse override switch)

An active feedrate override has an effect on all path axes that are assigned to the current channel. An active

rapid traverse override has an effect on all the axes that are traversed with rapid traverse and that are assigned

to the current channel.

No rapid traverse override switch available

If there is no dedicated rapid traverse override switch, you can choose between rapid traverse override and

feedrate override. The override to be active can be selected via the PLC or operator panel front. When rapid

traverse override is active, the feedrate override values are limited to 100%.

To activate the rapid traverse override via the operator panel front, the basic PLC program transfers the

selection of the feedrate override for rapid traverse to the activation signal for the rapid traverse override:

DB21, ... DBX6.6 = DB21, ... DBX25.3

and the feedrate override value in the rapid traverse override value:

DB21, ... DBB5 = DB21, ... DBB4

When selecting the rapid traverse override via the PLC, the PLC user program should set the activation signal

for the rapid traverse override:

DB21, ... DBX6.6 = 1

and the feedrate override value transferred into the rapid traverse override value:

DB21, ... DBB5 = DB21, ... DBB4

Effectiveness of the channel-specific feedrate and rapid traverse override

Active in G33, G34, G35

For active G63

In active G331, G332

not functional

Override factor

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

Sinumerik 840d sl