Siemens SINUMERIK 840D sl Function Manual

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R3: Extended stop and retract6.2 Control-managed ESRSpecial FunctionsFunction Manual, 09/2011, 6FC5397-2BP40-2BA0 365In order to perform retraction outside the AUTOMATIC mode as well, triggering of thisfunction is linked to the system variable $AC_ESR_TRIGGER. Retraction initiated via$AC_ESR_TRIGGER is locked, in order to prevent multiple retractions.6.2.2 Drive-independent reactionsGenerator operationGenerator operation is a drive function. Using the "Vdc control" function, the SINAMICS S120drive unit can monitor the DC link group for undervoltage. When an adjustable voltage valueis fallen below, then the drive intended for the purpose is switched into generator operation.The kinetic energy of the drive is used to buffer the DC link voltage. This allows the axes thatare still moving to be stopped and retracted in an ordering fashion on the NC side.ReferencesFor detailed information on the SINAMICS S120 drive function "Vdc control", see:• Function Manual SINAMICS S120 Drive FunctionsNoteAt the instant that it is switched into generator operation, if an axis is in closed-loop positioncontrol, then additional alarms can occur.