Siemens SINUMERIK 802D sl Function Manual page 79

Changing clamping torque and monitoring window
The commands FXST[x] and FXSW[x] can be used to change the clamping torque and the
fixed stop monitoring window in the part program. The changes take effect before traversing
movements in the same block.
Programming of a new fixed stop monitoring window causes a change not only in the
window width but also in the reference point for the center of the window if the axis has
moved prior to reprogramming. The actual position of the machine axis when the window is
changed is the new window center point.
Ramp for the torque limit
A ramp for changing the torque is specified in MD37012
FIXED_STOP_TORQUE_RAMP_TIME. This determines the length of the ramp until the new
torque limit is reached.
Without ramp
The torque limit is changed without taking into account the ramp if:
● FXS with (FXS[]=1) is activated to make sure that the reduction takes effect immediately
● The drive needs to be de-energized as quickly as possible in the event of a fault.
Response to pulse inhibit for the drive
MD37002 FIXED_STOP_CONTROL can be used to control the response in the case of
pulse inhibit at a fixed stop. When the pulses are cancelled, e.g. by using the IS "Pulse
enable", the function is not aborted. As a result, the drive will press against the fixed stop
again without any further operating action when the machine is restarted.
The rise time of the torque corresponds to the time needed by the current controller of the
drive to reach the limitation again.
If the pulses are deleted when a deselection is active (waiting for PLC acknowledgments),
the torque limit will be reduced to zero. If the pulses are reactivated during this phase, torque
is no longer built up. Once the deselection has been completed, you can continue traversing
as normally.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Travel to fixed stop (F1)
5.2 Functionality
79