Siemens SINAMICS DCM - Evaluation of Respond; Evaluation of Respond with One Power Switching Device; Evaluation of an 3 WL Circuit Breaker

Evaluating the safety functions according to EN ISO 13849 when using one switching device
9.3 Evaluation of "Respond"
Application document for functional safety STO, SS1 (ISO 13849-1)
50 Compact User Manual, 09/2016, A5E34871844AM
9.3
Evaluation of "Respond"
9.3.1
Evaluation of "Respond" with one power switching device
9.3.1.1
Evaluation of an 3WL circuit breaker
Result, 3WL circuit breaker K
AH1
Result
Reason
PL
d The values for determination are listed in the following ta-
bles.
PFH
D
Average probability of a dangerous
failure per hour
1.01 E-07
Determination of the PL for 3WL circuit breaker, channel 1
Parameter
Value
Reason
MTTF
D
3WL circuit breaker
High MTTF
D
> 30 years (410.95 years)
DC
Low
DC = 60%
Measures against CCF
Fulfilled It is assumed that the user has taken the necessary
measures.
Category
3 System response: One single failure does not result in the
loss of the safety function. Several, however not all faults
are detected.