Tracking The Deviation From Synchronism; Fundamentals - Siemens SINUMERIK 840D sl Function Manual

M3: Coupled axes
5.5 Generic coupling
The rapid stop is set at:
• Stop A and Stop C (Safety Integrated)
• Alarms with rapid stop as configured braking behavior
• Reaching the hardware limit switch and rapid stop as configured braking behavior:
MD36600 $MA_BRAKE_MODE_CHOICE = 1
Switchover to actual-value coupling.
The actual values of the leading spindle are used to calculate the setpoint values as soon as
the rapid stop of the leading spindle is reported to a generic coupling.
The changeover to actual value coupling takes place smoothly and remains active till the
servo enable as well as the pulse enable is available again to the leading spindle and no more
position offset takes place. The setpoint value calculation is programmed as with
CPLSETVAL only if these conditions are fulfilled.
Note
A rapid stop that was initiated on reaching the hardware limit switch does not changeover the
actual value coupling.
Response of the following spindle
If a rapid stop is detected for a leading spindle and the following spindle does not execute any
rapid stop by itself, then the following spindle tries to follow the dynamics of the movement of
the leading spindle defined within its framework. As position synchronization is generated,
there may be oscillations in the following axis in relation to the position to be approached.
The start of a rapid stop for a leading axis/spindle is detected across NCUs.
Note
A simultaneous rapid stop of the leading and following spindle is executed in the
synchronized spindle coupling type (CPSETTYPE="COUP") during a servo alarm.
5.5.12

Tracking the deviation from synchronism

5.5.12.1

Fundamentals

Deviation from synchronism
Workpiece machining operations which are to be carried out both on the face front and the
face rear require a workpiece transfer to another workpiece receptacle (e.g. a counterspindle
chuck).
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions