Siemens SINAMICS S120 Function Manual page 98

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
● 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 Functions
active.
Note
If you must use this function, then before the flying restart, you can deactivate the Safety
Integrated Functions, and then reactivate them again after the flying restart has been
completed.
In this case, the user must check as to whether it is permissible that the safety functions
are deactivated during the flying restart.
It is only permissible to activate and deactivate Safety Integrated Functions using failsafe
signals.
● DC brake
When using this function, DC current is impressed to brake the drive: This can result in an
error in the encoderless, safe actual value sensing and in turn in an associated stop
response.
Note
If you must use this function, then before braking, you can deactivate the Safety
Integrated Functions, and then reactivate them again after braking has been completed.
In this case, the user must check as to whether it is permissible that the safety functions
are deactivated during braking.
It is only permissible to activate and deactivate Safety Integrated Functions using failsafe
signals.
● Closed-loop controlled operation down to f = 0 Hz with test signal (see corresponding
chapter in the SINAMICS S120 Function Manual Drive Functions)
If you use Safety Integrated without encoder simultaneously with the function "Closed-
loop controlled operation up to f = 0 Hz with test signal", the drive may react with an
undesired safety message and a stop reaction. In this case, you cannot use the
combination described.
Recommendations for stable operation with active Extended Functions without encoder
The following preconditions must be fulfilled to avoid fault messages from the safe actual
value sensing without encoder:
● The motor and the power unit are adequately dimensioned for this application.
● Motor and power unit should fulfill the following condition: The ratio between the rated
power unit current (r0207[0]) and rated motor current (p0305) should be less than 5.
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Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated