Siemens sinumerik 840D sl Function Manual page 280

Detailed description
2.4 Electronic gearbox (EG)
These functions have no effect on cyclic machines because they are performed without
operator actions. Nor does it make sense to perform automatic (re-)positioning via the NC
with external master values.
2.4 Electronic gearbox (EG)
Function
With the aid of the "Electronic gearbox" the movement of a following axis FA can be
interpolated dependent of up to five leading axes LA. The relationship between each leading
axis and the following axis is defined by a coupling factor. The following axis motion
components derived in this manner from the individual leading axis motion components have
an additive effect.
FA
set
with:
SynPosFA, SynPosLA
FA
setpoint
LA : Setpoint or actual value of the ith leading axis (depending on the type of coupling - see
i
below)
KF
i
All paths are referred to the basic co-ordinate system BCS.
When an EG axis group is activated, it is possible to synchronize the leading axes and
following axis in relation to a defined starting position.
From the parts program a gearbox group can be:
• defined,
• activated,
• deactivated,
• deleted.
Extensions
The influence of each of the 5 leading axes can be specified using a curve table as an
alternative to a transmission ratio (KF=numerator/denominator).
It is thus possible for each curve (except for the special case of a straight line) for the leading
axis to influence the following axis in a non-linear manner. The function can only be used
with EGONSYN.
The function EG can be activated with curve tables with EGON.
The function EGONSYNE is available for approaching the synchronized position of the
following axis with a specified approach mode.
For special applications, it may be advisable configure the position controller as a PI
controller.
60
= SynPosFA + (LA SynPosLA
1-
: from call EGONSYN (see below)
i
: Partial setpoint of the following axis.
: Coupling factor of the ith leading axis (see below)
)*CF +... +(LA SynPosLA
1 1 5-
Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
)*CF
5 5