Siemens sinumerik 840D sl Function Manual page 620

2.2.5 Presetting the drive machine data
P component in the speed controller
If axes are put into operation individually in a master-slave coupling, whereby an individual
axis takes the full load, the P component in the speed controller must then be halved in the
two axes. This is the only way to ensure that overshoot is avoided when traversing the axis
with active coupling.
2.2.6 Activating and deactivating a coupling
Conditions for activation and deactivation
A coupling is activated or deactivated only under the following conditions:
• Master and slave axes are operating in position control mode (DB3x.DBB 61.5) or, in the
• Master and slave axis are at standstill (DB3x.DBB 61.4).
• The channels of the master and slave axes are in the "RESET" state.
• (DB2x.DBB35.7). This condition can be switched on or off by means of a bit in
If the master axis and slave axis are in different channels, both channels must be in the
"RESET" state. In the event of axis replacement, the state of the master channel is decisive:
MD30550 $MA_AXCONF_ASSIGN_MASTER_CHAN
A channel is in the "RESET" state after the end of a program (M30) or after a "RESET" from
the operator panel.
Master-slave coupling after POWER ON always active
MD63590 $MA_MS_COUPLING_ALWAYS_ACTIVE defines a coupling as always active.
The coupling is activated as soon as the conditions for activation of a coupling are satisfied
after a POWER ON. It can no longer be deactivated, i.e. it is no longer possible to operate
the drives separately.
The machine data of the slave axis are always relevant for a coupling.
If it is not possible to activate a coupling after POWER ON because, for example, the axes
are not in the position control state, alarm "75160 slave axis AX1, master-slave coupling not
active" is output. Further attempts are made to close the coupling. Once all the conditions
have been satisfied, the coupling is closed and the alarm deleted.
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
case of spindles, in speed control mode.
MD63595 $MA_TRACE_MODE.
Detailed description
2.2 Speed/torque coupling (up to SW 5.x)
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