Siemens SINUMERIK 840Di sl Commissioning Manual page 406

NC Commissioning with HMI Advanced
11.5 Axes and spindles
Note
The speed feedforward control can be used in conjunction with DSC.
Requirements
Before you can activate DSC mode, the following preconditions must be fulfilled:
● DSC-capable drive, e.g.:
● A DSC-capable message frame type has been parameterized in the S7 project for the
Switch-on/switch-off
The DSC function is switched ON in the following axis-specific NC machine data:
● MD32640 $MA_STIFFNESS_CONTROL_ENABLE (dyn. Stiffness control)
If DSC operation is switched ON or OFF, it might be necessary to adjust the following
machine data:
● MD32200 $MA_POSCTRL_GAIN (Kv factor)
● MD32610 $MA_VELO_FFW_WEIGHT (feedforward control factor)
● MD32810 $MA_EQUIV_SPEEDCTRL_TIME (substitute time const. of the closed speed
Speed setpoint filter
If you use DSC, a speed setpoint filter for rounding the speed setpoint steps is no longer
necessary. The speed setpoint filter is then only of any use with differential connection to
support the position controller, for example, to suppress resonance.
Measuring system
DSC is only possible in conjunction with the motor measuring system.
406
– SINAMICS S120
– SIMODRIVE 611 universal
– SIMODRIVE POSMO CD/CA
– SIMODRIVE POSMO SI
drive (see Section "DP Slave: SINAMICS S120" (Page 287)).
control loop).
NOTICE
Before you can switch off DSC operation you might have to adapt (reduce) the Kv factor
of the axis. Otherwise, instability of the position control loop might result.
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Manual