Residual Risk - Siemens Sinamics S120 Function Manual

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1.3

Residual risk

The fault analysis enables machine manufacturers to determine the residual risk at their
machine with regard to the drive unit. The following residual risks are known:
Res idual risk t hrough possible hardware faults: PFH v alue
Due to the intrinsic potential of hardware faults, electrical systems are subject to additional
residual risk, which can be expressed by means of the PFH value.
• Take into account these residual risks when designing your machine and where
Danger to life due t o uncontrolled acceleration of t he drive
Faults in the absolute track (C-D track), cyclic interchange of the drive phases (V-W-U
instead of U-V-W) and reversal of the control direction may cause acceleration of the drive.
Category 1 and 2 stop functions according to EN 60204-1 (fault response functions Stop B
to D according to Safety Integrated) that are provided are however not effective due to the
fault.
• Category 0 stop function according to EN 60204-1 (fault response function Stop A
Danger to life due t o s hort, limited movements of t he motor.
Simultaneous breakdown of 2 power transistors in the power unit can cause a short, limited
movement. This can cause accidents resulting in serious injuries or death.
• If there is a hazard due to unwanted movement in your application, take measures to
Danger to life due t o higher speeds of short duration when the limit v alue is exceeded
Violation of limits may briefly lead to a speed higher than the speed setpoint, or the axis
may pass the defined position to a certain extent, depending on the dynamic response of
the drive and on parameter settings.
• Take into account this situation when designing your machine and where necessary
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
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necessary apply suitable countermeasures.
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according to Safety Integrated) is not activated until the transition or delay time set in the
parameter has expired. These faults are detected when SAM is selected (fault reaction
functions STOP B/C) and stop function category 0 according to EN 60204-1 (fault
reaction function STOP A according to Safety Integrated) is triggered as early as
possible regardless of this delay. Electrical faults (defective components or similar) may
also lead to the response stated above.
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counter it, for example, by using a brake with safe monitoring. Further information can
be found in Section "Safe Brake Control (SBC) (Page 71)".
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apply suitable countermeasures.
Fundamental safety instructions
1.3 Residual risk
21

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