Siemens SINAMICS DCM - Result When Using a 3 WL Circuit Breaker; Result When Using a Power Contactor

Evaluating the safety functions according to EN ISO 13849 when using one switching device
9.4 Result when using a 3WL circuit breaker
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM
53
Determination of the PL E-Stop, channel 2
Parameter
Value
Reason
MTTF
D
SINAMICS DCM E-Stop
High MTTF
D
> 30 years (312 years)
DC
Low DC = 67%
Measures against CCF
Fulfilled It is assumed that the user has taken the necessary
measures.
9.4
Result when using a 3WL circuit breaker
PL
Average probability of a dangerous failure per hour
DETECT e 9.06 E-10
EVALUATE
e
5.42 E-09
RESPOND
d
1.01 E-07
Result
Reason
PL d The PL of all tasks of the supplementary safety function is at
least d.
Average probability of a dangerous
failure per hour
1.07 E-07
9.5
Result when using a power contactor
PL
Average probability of a dangerous failure per hour
DETECT
e
9.06 E-10
EVALUATE
e
5.42 E-09
RESPOND
d
1.01 E-07
Result
Reason
PL d The PL of all tasks of the
supplementary safety function is at
least d.
Average probability of a dangerous
failure per hour
1.07 E-07