Siemens SINAMICS S120 Function Manual page 26

System features
2.4 Residual risk
• Faults in the absolute track (C-D track), cyclic interchange of the drive phases (V-W-U
• Simultaneous failure of two power transistors (one in the upper and the other offset in
• Violation of limits may briefly lead to a speed higher than the speed setpoint, or the axis
• Mechanical forces greater than the maximum drive torque may force a drive currently
26
WARNING
instead of U-V-W) and reversal of the control direction may cause acceleration of the
drive. However, the fault prevents activation of the category 1 and 2 stop functions to
IEC 60204-1 (fault reaction functions STOP B to E according to Safety Integrated).
The category 0 stop function to IEC 60204-1 (fault reaction function STOP A according
to Safety Integrated) is not triggered unless the transition or delay time set in the
parameter has expired. These faults are detected (fault reaction function STOP B/C) if
SBR is active. The Category 0 stop function to IEC 60204-1 (fault reaction functions
STOP A according to Safety Integrated) is activated as early as possible irrespective of
this delay. Electrical faults (defective components or similar) may also lead to the
response stated above.
the lower inverter bridge) in the inverter may cause brief movement of the drive,
depending on the number of poles of the motor.
Maximum value of this movement:
Synchronous rotary motors: max. movement = 180° / no. of pole pairs
Synchronous linear motors: max. movement = pole width
WARNING
may pass the defined position to a certain extent, depending on the dynamic response
of the drive and on parameter settings.
operated in position control mode out of the Safe Operational Stop state (SOS) and
trigger a category 1 stop function to IEC 60204-1 (fault reaction function STOP B).
Function Manual, (FHS) , 07/2007 Edition, 6SL3097-2AR00-0BP0
Safety Integrated