Siemens SINUMERIK 840D sl Function Manual page 1478

Detailed description
2.12 Block descriptions
2.12.20 FC 17: YDelta star/delta changeover
Description of Functions
The block for star/delta changeover controls the timing of the defined switching logic such
that the changeover can be performed in either direction even when the spindle is running.
This block may be used only for digital main spindle drives and must be called separately for
each spindle.
The changeover operation is implemented via 2 separate contactors in a sequence involving
4 steps:
Step 1:
Step 2:
Step 3:
Step 4:
Figure 2-28 Star/delta changeover
For more detailed information about motor speed adjustments, please see:
References:
/FB1/Function Manual, Basic Functions; Spindles (S1);
Chapter "Configurable gear adjustments"
/FB1/Function Manual Basic functions; Velocities, Actual/Set point system, Regulation (G2)
204
Deleting the interface signal DB31, ... DBX21.5 (Motor selection done) in the related
axis-DB and register the changeover process via A with
DB31, ... DBX21.3 (Motor selection).
As soon as the return message NST DB31, ... DBX93.7 (Pulse enabled) and the
acknowledgment of the announced motor selection from the drive have appeared, the
currently energized contactor drops out.
The other contactor is energized after the time period set by the user in parameter
"TimeVal" has elapsed.
After a further delay, the changeover is signaled to the drive with NST
DB31, ... DBX21.5 (Motor selection done) reported.
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0