1.5 Extended stop and retract: ESR (SW 5 and higher)
The “extended stop and retract” function (ESR) can be used to define flexible
responses to definable error sources, reducing the risk of damaging the
workpiece.
 Stop: As far as possible, all axes participating in the electronic coupling are
stopped (this concerns the axes in the machining plane).
 Retract (SW 5.2 and higher): The tool/workpiece pair engaged in action is
separated as quickly as possible by retracting the tool from the machining
position.
 Generator operation: In the event of a power failure, the power for the
retract operation can be provided in the DC link (the DC link voltage is
maintained through additional back-up capacitors or drive operating in
generator mode).
As an expansion of the drive-independent stop and retract measures
implemented in SW 5, NC-controlled stop and retract operations are available
in SW 6 and higher. With NC-controlled operations, for example, an axis
grouping on an electronic gear remains in synchronism even during stopping for
a specified period to provide extensive protection against:
 Injury to persons
 Damage to equipment (workpiece and expensive hobbing cutter for
example)
In addition to the retraction of selected axes to specific positions without axis
referencing, a linear retraction function is also available.