Siemens SINAMICS S120 Function Manual page 680

Safety Integrated Basic Functions
10.3 Safety instructions
Danger to life as a result of undesirable motor movement when automatically restarting
The Emergency Stop function must bring the machine to a standstill according to stop
Category 0 or 1 (STO or SS1) (EN 60204-1).
It is not permissible that the motor automatically restarts after an Emergency Stop, as this
represents danger to life as a result of the associated undesirable motor motion.
When individual safety functions (Extended or Advanced Functions) are deactivated, an
automatic restart is permitted under certain circumstances depending on the risk analysis
(except when Emergency Stop is reset). An automatic start is permitted when a protective
door is closed, for example.
• For the cases listed above, ensure that an automatic restart is absolutely not possible.
Danger to life as a result of undesirable motor motion when the system powers up and the
drives are activated after changing or replacing hardware and/or software
After hardware and/or software components have been modified or replaced, it is only
permissible for the system to run up and the drives to be activated with the protective
devices closed. Personnel shall not be present within the danger zone.
• It may be necessary to carry out a partial or complete acceptance test or a simplified
• Before personnel may re-enter the hazardous area, all of the drives should be tested to
• When switching on carefully observed the following:
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WARNING
WARNING
functional test after having made certain changes or replacements.
ensure that they exhibit stable control behavior by briefly moving them in both the plus
and minus directions (+/-).
The Safety Integrated functions are only available and can only be selected after the
system has completely powered up.
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions