Siemens SINUMERIK 840D sl Function Manual page 374

Compensations (K3)
Interpolatory compensation
10. Setting:
Monitoring
To avoid excessive velocities and acceleration rates on the machine axis as a result of
applying sag compensation, the total compensation value is monitored and limited to a
maximum value.
The maximum compensation value is set for each axis with the following axial machine data:
MD32720 $MA_CEC_MAX_SUM
(maximum compensation value for sag compensation).
If the resulting total compensation value is greater than the maximum value, alarm 20124
"Sum of compensation values too high" is output. Program processing is not interrupted. The
compensation value output as an additional setpoint is limited to the maximum value.
Alteration of the total compensation value is also limited axially.
When the limit value defined by the following machine data is violated, alarm 20125 "Too
rapid change in compensation value" is generated:
MD32730 $MA_CEC_MAX_VELO (change in velocity with 1)
The program continues to run. The path not covered because of the limitation is made up as
soon as the compensation value is no longer subject to limitation.
374
MD10260 $MN_CONVERT_SCALING_SYSTEM=1
(basic system switchover active)
activates the following axial machine data:
MD32711 $MA_CEC_SCALING_SYSTEM_METRIC
(system of units of sag compensation)
The measuring system for all tables effective for this axis is set in this machine data.
Hereby all position entries are interpreted together with the calculated total compensation
value in the configured measuring system. External conversions of position information
are no longer necessary with a measuring system change.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions