Siemens SINUMERIK 840D sl Function Manual page 298

H1: Manual travel and handwheel travel
4.4 Handwheel travel in JOG
A traversing movement defined by the handwheel for a machine axis is defined by:
● Traversing path
● Size of the variable increment
● Machine-axis assignment
Movement in the opposite direction
Depending on machine data:
MD11310 $MN_HANDWH_REVERSE (threshold for handwheel change of direction),
the response to a change of the traversing direction is as follows:
● If the handwheel is moved in the opposite direction, the resulting distance is computed
● If the handwheel is moved in the opposite direction by at least the number of pulses
Acceleration
With manual travel, acceleration takes place according to a programmed characteristic. The
acceleration characteristic effective for JOG for the individual axis is defined, using the
following axial machine data:
MD32420 $MA_ JOG_AND_POS_JERK_ENABLE (basic setting of the axial jerk limiting)
Reference:
Function Manual, Basic Functions; Acceleration (B2)
Response at software limit switches, working-area limitation
When axes are traversed in JOG mode, they can traverse only up to the first active limitation
before the corresponding alarm is output.
Depending on machine data:
MD11310 $MN_HANDWH_REVERSE (threshold for direction change, handwheel)
the response is then as follows (as long as the axis has still not arrived at the end point from
the setpoint side):
● The distance resulting from the handwheel pulses forms a fictitious end point which is
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(SD41010 $SN_JOG_VAR_INCR_SIZE)
(MD32080 $ HANDWH_MAX_INCR_SIZE)
and the calculated end point is approached as fast as possible.
If this end point is located before the point where the moving axis can decelerate in the
current direction of travel, the unit is decelerated and the end point is approached by
moving in the opposite direction. If this is not the case, the newly calculated end point is
approached immediately.
indicated in the machine data, the axis is decelerated as fast as possible and all pulses
received until the end of the interpolation are ignored.
This means another movement takes place only after the axis reaches zero speed
(setpoint side).
used for subsequent calculations.
If this fictitious end point is positioned, for example, 10 mm behind the limitation, these
10 mm must be traversed in the opposite direction before the axis traverses again. If a
movement in the opposite direction is to be performed immediately after a limitation is
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions