Spindle Gear Stage 0 - Siemens SINUMERIK 840D Function Manual

S1: Spindles
18.4 Configurable gear adaptations
Special features
The following points must be observed on gear stage change:
● The gear stage change is not terminated by selecting
NC/PLC IS:
DB31, ... DBX20.1 (run-up switchover to V/f mode).
Setpoint 0 is output.
The gear stage change is acknowledged as usual
via the NC/PLC interface signal:
DB31, ... DBX16.3 (gear is changed)
● The "Ramp-function generator rapid stop" signal must be reset by the PLC before the gear
stage change is completed by the PLC.
● The process sequence of the gear stage change is ended during NC reset without any alarm
output.
The gear stage output with NC/PLC IS:
DB31, ... DBX16.0-16.2 (actual gear stage A to C)
is applied by the NC.
Star/delta switchover with FC17
Digital main spindle drives can be switched in both directions between star and delta using
FC17, even when the spindle is running. This automatic switchover is controlled by a defined
logic circuit in FC17 which provides the user with a configurable switchover time for the relevant
spindle.
Further information
For further information on the FC17 function block, see Function Manual PLC.
18.4.2

Spindle gear stage 0

Technical background
For machine's where the spindle load gear can be changed over, situations can occur where
the gear train between the motor and load (workpiece/tool) is interrupted. This state can occur,
e.g. when pressing Reset or Emergency Stop while performing a gear stage change or when
the machine is commissioned for the first time while it is being installed. The control must
identify this state where the gear train is open and the next gear stage change request must be
unconditionally executed.
Function
When the gear is disengaged, the binary-coded value "0" (≙ gear stage 0) is transferred to the
NC from the PLC using the interface signal bits DB31, ... DBX16.0-2 (actual gear stage A to C):
DB31, ... DBX16.0-2 = 0
The value is used by the control to identify the state where the gear train is open.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA