Speed/torque coupling, master-slave (TE3)
23.11 Supplementary conditions
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
403
Hardware and software limit switches
Crossing of hardware and software limit switches is detected in coupled axes; the software
limit switch is generally overtraveled on slave axes. The alarm is output on the slave axis,
while braking is initiated via the master axis.
The path traveled after the slave software limit switch responds is equal to the distance
required by the master axis to brake the coupling.
The master axis controls the movement away from the limit switch, since the coupling cannot
be disconnected until the cause of the alarm has been eliminated.
23.11
Supplementary conditions
Note
The master-slave function requires the master and slave axes to be operated on the same
802D sl control system. They must not be PLC axes.
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Closing and separating the master-slave coupling is carried out when the axis has
stopped.
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Traversing a slave axis with the coupling closed is possible only via the master axis.
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When the coupling is closed using the slave axis, the master axis is braked automatically.
This produces an asymmetric response on closure and separation of the coupling. In
contrast to closing, there is no automatic braking on separation.
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If a traversing movement is programmed for a slave axis that has already been coupled,
the alarm "14092 Channel %1 Block %2 Axis %3 has the wrong type" appears.
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The setpoint position of the coupled slave axis corresponds to the current actual position.
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On request, the coupling is made or released independent of the channel status the next
time the axis stops. This allows the coupling status to be changed even during part
program processing.
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PLC interface signal V390x 0001.5 "Position controller active" must no longer be
evaluated in the braking control logic of the slave axis. This is no longer set for an active
coupling. Instead, interface signal V390x 5000.7 "Master-slave coupling status active"
should be used.
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If a master axis is simultaneously configured as a slave axis, the alarm "26031 Axis %1
Configuration error master-slave" appears. So cascading is not possible.
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If a coupling is requested and closed, the control activation signals are derived directly
from the master axis.
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The master-slave coupling must be deactivated prior to a gear change or a star-delta
(wye-delta) switchover.