Constraints; Speed/Torque Coupling (Sw 6 And Higher) - Siemens SINUMERIK 840D sl Function Manual

TE3: Speed/torque coupling, master-slave

12.8 Constraints

12.8 Constraints
12.8.1

Speed/torque coupling (SW 6 and higher)

General
• Master and slave axes must be on the same NCU.
• A coupling is closed or opened independent of the channel state the next time that the axis
is at a standstill.
• Slave axes can only be traversed via the master axis when the coupling is closed.
• A coupled slave axis cannot be switched further via the axis container.
• A requested axis interchange of coupled slave axes is not executed.
• When the coupling is switched-in (closed) via the slave axis, the master axis is braked
automatically (if the channel axis is in the same channel). This produces an asymmetric
behavior when the coupling is switched-in and switched-out. In contrast to switching-in
(closing), there is no automatic braking when switching-out (opening).
• The setpoint position of a coupled slave axis corresponds to its actual position.
• For axes and spindles in the positioning mode, the coupling is only switched-in (closed)
and switched-out (opened) at standstill (zero speed).
• The master-slave coupling must be deactivated prior to a gear change or a star-delta
switchover.
Axial monitoring functions
• Except monitoring the speed setpoint and actual speed, axial monitoring functions like
contour and standstill in the slave axis are inactive because of the missing position
controller. The position control circuit parameters like gain factor, precontrol, balancing
can thus be set differently for master and slave axes without the monitoring functions
responding.
• In order to ensure the same braking behavior for all axes of a master-slave group, when
the coupling is active, the same alarm reaction is applied to all of the axes of the master-
slave group.
• When canceling error states, the slave axes do not reposition to the point of interruption.
Virtual axis
Master and/or slave axes must not be "virtual" axes:
MD30132 $MA_IS_VIRTUAL_AX (axis is virtual axis)
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions