Siemens SINUMERIK 840D sl Function Manual page 528

TE3: Speed/torque coupling, master-slave
12.8 Constraints
Safety Integrated (new 840D sl)
As the slave axis is traversed via the master axis speed setpoint, the axial setpoint limit
MD36933 $MA_SAFE_DES_VELO_LIMIT is inactive in the coupled slave axes. All safety
monitoring functions remain active in the slave axes however.
Weight counterbalance
The additional torque for the electronic counterweight MD32460 $MA_TORQUE_OFFSET is
computed in the following axis, irrespective of the coupling status.
Gear stage change with active master-slave coupling
An automatic gear stage change in a coupled slave spindle is not possible and can only be
implemented indirectly using the master spindle. The point in time at which the gear stage is
changed is then derived from the master spindle. The oscillating motion of the coupled slave
spindle is generated implicitly via the oscillating motion of the master spindle.
in contrast to the master spindle, the associated parameter block must be explicitly selected
in the coupled slave spindle. To enable the parameter block to be specified, the following
machine data must be set to the value 2:
MD35590 $MA_PARAMSET_CHANGE_ENABLE (parameter set change possible)
In the event of a gear stage change for the master/slave spindle, the associated parameter
set index can be activated by the PLC via the VDI interface.
Note
For more information about gear stage change and parameter sets for changes in spindle
mode, see:
References:
/FB1/ Function Manual, Basic Functions; Spindles (S1)
Axis container
If a coupled slave axis is configured in an axis container, alarm "4025 Switch axis container
%3 not permitted: Master-slave active channel %1 Axis %2" is output. The axis container may
not be advanced because the coupling is active.
In the event that masters change, dynamic configuration can be used to match the relevant
spindle the master spindle following a rotation of the axis container. Both master and slave
spindles can be container spindles.
For a coupling to be closed after container rotation using a different spindle in each case, the
old coupling must be disconnected before the rotation, the configuration deleted and the new
coupling closed after the rotation.
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions