Siemens SINUMERIK 840D sl Function Manual page 1660

Detailed Description
2.3 Configurable gear adaptation
Tool change
If the intermediate gear is changed at the same time as the tool, the user must also
reconfigure the transmission ratio of the numerator and denominator via the machine data of
the intermediate gear.
Example:
In the case of an installed tool with a transmission ratio of 2:1, a suitable intermediate gear is
configured and is activated immediately in the part program with the command NEWCONF.
N05 $MA_DRIVE_AX_RATIO2-NUMERA[AX5] = 2
M10 $MA_DRIVE_AX_RATIO2-DENOM[AX5] = 1
N15 NEWCONF
Caution
It remains the task of the user to stop within the appropriate period in order to make changes
to the machine data when required and then activate a "NewConfig".
Switchover
Switchover to a new transmission ratio is performed immediately by means of NewConfig.
From a technological viewpoint, the associated mechanical switchover process takes some
time, since, in mechanical terms, a different intermediate gear with rotating tool is being
installed.
Note
At zero speed, switchover is jerk-free. The user is therefore responsible for taking
appropriate precautions.
Applications in which switchover takes place during motion and which require smoothed or
soft speed transition can be handled using existing setpoint speed filters.
For further instructions for control technical dependencies see:
Literature:
/FB1/ Function Manual, Basic Functions; Speeds, Setpoint/Actual Value System, Control
(G2)
50
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0