Technical Appendix
6.3 Application note: unipolar spindle control
6-123
SINUMERIK 802C
6FC5 597–3AA20–0BP2 (01.02)
Technical Appendix
6.3 Application note: unipolar spindle control
General
With SINUMERIK 802C, the spindle speed setpoint is generally output in the range from –10V
through +10V (S... M3 or M4). A setpoint output with positive polarity only (0V through +10V)
and an additional direction signal, as it is required for unipolar frequency converters, can be
realized via appropriate programming in the NC part program and in the PLC user program
(additionally, two M commands for switching the direction signal and M3 for starting rotation).
A direction reversal may only be carried out with setpoint zero (spindle at standstill). It should
be taken into account that the setpoint output is provied by the NC, but switching of the direc-
tion signal is provided by the PLC. In other words: It must be ensured by the user program
that the new direction signal is only provided if the spindle has stopped. A new rotation start
may only be provided after the direction signal has been output by the PLC.
Position–controlled spindle mode (SPOS= , G331,G332, LCYC84) is not possible with unipo-
lar spindle control.
NC programming
N10 M5 ;Spindle stop
N20 G4 F15 ;Dwelling if necessary, spindle must have stopped safely
what can also be provided by the PLC user program
N30 M23 ;M23 will be the new direction signal
N40 S200 M3 ;New spindle speed and start of rotation
N100 M5 ;Spindle stop
PLC programming
according to the particular conditions and requirements, taking into account what was mentio-
ned below;
M23 and M24, for example, are the M commands for the direction signals and must be eva-
luated accordingly by the user program; then, the direction signal must be set.
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