P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1027
Boundary conditions
Star-delta changeover on digital main spindle drives initiates a process, which contains closed-loop control
sequences. Since the closed-loop control system supports automatic star-delta changeover, certain restrictions
should be noted:
• Due to the automatic deactivation of the pulse on the drive, the NST DB31,....DBX93.7 (Pulse enabled)
deactivates simultaneously the IS DB31,....DBX61.7 (current controller active) and DB31,....DBX61.6
(speed controller active).
• If a changeover from star to delta takes place while the spindle is rotating and the spindle position controller is
switched on, IS "Position controller active" (DB31, ... DBX61.5), this triggers alarm 25050 "Contour
monitoring".
• Once the star-delta changeover has been initiated with FC17, it cannot be delayed by the user, e.g. by
waiting until the star/delta contactors change over during the course of operation. The user can implement this
signal interaction with PLC logic.
Declaration of the function
STL representation
Description of formal parameters
The table below lists all formal parameters of the YDelta function:
VAR_INPUT
YDelta: BOOL; //Star = 0, delta = 1
SpindleIFNo: INT; //Machine axis number
TimeVal: S5TIME ; //Time value
TimerNo : INT; //User timer for changeover time
END_VAR
VAR_OUTPUT
Y: BOOL; //Star contactor
Delta: BOOL; //Delta contactor
END_VAR
VAR_IN_OUT
Ref: WORD ; //Block status word (instance)
END_VAR
Signal
Typ
e
Type Value range Comment
YDelta I BOOL = Star
= Triangle
The changeover edge of the signal
initiates the changeover operation.
SpindleIFNo I INT 1 ... Number of the axis interface
declared as a spindle
TimeVal I S5time 0 ... Switchover time
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