Siemens SINUMERIK 840D sl Function Manual page 393

Parameter: <Axis_n>
Function:
Type:
Range of values:
Parameter: <retraction velocity _n>
Function:
Unit:
Type:
Range of values:
Parameter: <retraction distance _n>
Function:
Unit:
Type:
Range of values:
Note
Retraction speed
It should be ensured that the drive can reach the programmed retraction speed (see
parameters <retraction velocity_n>) within the retraction time (see parameter <retraction
distance _n>). The settings in the following drive parameters should be checked:
• p1082[0...n] (maximum speed)
• p1135[0...n] (OFF3 ramp-down time)
Retraction path
The conversion of the retraction path into a retraction time for drive parameter p0892 is
executed under the assumption that the retraction motion is triggered when the axis is at a
standstill (see the diagram "Behavior for a drive-integrated retraction", Chapter "Configuring
retraction in the drive [Page 385]").
If retraction motion is triggered while the axis is traversing, the actually traversed retraction
distance differs from the programmed retraction distance due to the fact that traversing
motion is superimposed on the retraction motion.
Dependencies
The programmed values for the retraction path and the retraction velocity refer to the load
side. Before writing to the drive parameters these are converted over to the motor side. The
transmission ratio effective in the NC at the execution time is applicable for the conversion. If
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
For the specified axis, writes to drive parameter p0888
(configuration): p0888 = 2
AXIS
Channel axis identifier
For the axis specified under <Axis_n>, writes to drive parameter
p0893 (retraction speed):
p0893 = (<retraction velocity> based on the currently effective total
transmission ratio converted into the corresponding retraction
speed)
mm/min, inch/min, degrees/min (depending on the unit of the axis)
REAL
0.00 - MAX
For the axis specified under <Axis_n>, writes to drive parameter
p0892 (retraction time):
p0892 = <retraction distance_n> / <retraction velocity _n>
mm, inches, degrees (depending on the unit of the axis)
REAL
MIN - MAX
R3: Extended stop and retract
6.3 ESR executed autonomously in the drive
393