Siemens SINAMICS S120 Commissioning Manual page 233

● Data set switchover
The motor and drive data switchover can always be used for safety functions without
encoder. It is not possible to switch over between induction and synchronous motors (this
is interlocked). For several motor data sets it must be ensured that all motors have the
same number of pole pairs. If the number of pole pairs in r0313 is not the same value that
was taken into account when configuring the safe actual value acquisition (gearbox), then
the calculated, safe actual speed no longer corresponds to the mechanical speed of the
shaft.
When SLS is activated, the shaft can rotate faster than the configured limits.
● Alternating acceleration/deceleration
For alternating acceleration and deceleration, it must be ensured that the following
conditions are maintained.
– Within 1 s, only one acceleration and one braking ramp are permissible.
● This also applies to positioning operation; it may be necessary that the position control
settings and traversing profiles must be adapted so that no overshoots occur in the speed
characteristic (e.g. reduce the dynamic response, use flatter braking ramps).
● Flying restart
A flying restart should not be performed in operation with the Safety Integrated extended
functions active.
Note
If you must use this function, then before the flying restart, you can deactivate the Safety
Integrated extended functions, and then activate them again after the flying restart has
been completed.
It is only permissible to activate and deactivate Safety Integrated extended functions
using fail-safe signals.
• Check whether it is permissible that the safety functions are deactivated during the
● DC brake
When using this function, DC current is injected to brake the drive. This can result in a
fault of the encoderless safe actual value acquisition and a consequent stop response.
Note
If you must use this function, then before braking, you can deactivate the Safety
Integrated extended functions, and then activate them again after braking has been
completed.
It is only permissible to activate and deactivate Safety Integrated extended functions
using fail-safe signals.
• Check whether it is permissible that the safety functions are deactivated during
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
Therefore, for a cycle 0 → +n
flying restart.
braking.
4.10 Safety Integrated commissioning
→ -n → 0 – one period of at least 2 s is required.
set set
Commissioning
233