Nonacknowledged Gear Step Change - Siemens SINUMERIK 840D Function Manual

Changeover
Changeover to a new transmission ratio is performed immediately with the aid of the "Activate
machine data" function. From a technological viewpoint, the associated mechanical
changeover process takes some time, since, in mechanical terms, a different intermediate gear
with rotating tool is being installed.
Note
At zero speed, changeover is jerk-free. The user is therefore responsible for taking appropriate
precautions.
Applications in which changeover takes place during motion and which require smoothed or
soft speed transition can be handled using existing setpoint speed filters.
For further explanations regarding control engineering dependencies, see Section "G2:
Velocities, setpoint / actual value systems, closed-loop control (Page 31)".
18.4.6

Nonacknowledged gear step change

Mode change
A gear stage change that has not been acknowledged cannot be interrupted by a change in
operating mode (e.g. switchover to JOG).
The switchover is delayed by the maximum period entered in machine data:
MD10192 $MN_GEAR_CHANGE_WAIT_TIME
.
If the gear stage change is not acknowledged within this time, the NC will output an alarm:
Further events
Events that initiate reorganization will also wait until a gear stage change is completed.
The time entered in machine data:
MD10192 $MN_GEAR_CHANGE_WAIT_TIME
determines how long the control waits before executing the gear stage change.
If this time elapses without the gear stage change being completed, the NC responds with an
alarm.
The following events have an analog response:
● User ASUP
● Mode change
● Delete distance-to-go
● Axis replacement
● Activate PI user data
● Enable PI service machine data
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S1: Spindles
18.4 Configurable gear adaptations
793