Specific Parameters For Ac 01.2 Controls In Sil Version With Actuators Of Sq. 2 Series - AUMA SQ 05.2-SQ 14.2 Manual

Safety-related figures
9.2.

Specific parameters for AC 01.2 controls in SIL version with actuators of SQ. 2 series

36
The following figure tables provide an example of safety-related figures for the different
versions. Complete data records of safety-related figures of all variants are available
within the exida test report.
When determining the PFD values, please note that the stipulated proof test cannot
fully restore the system. For this reason, the following data is used for calculation:
PTC = 90 % (proof test coverage rate [%])
T = 1 year (proof test interval [h])
1
T = 10 years (requirement interval = lifetime [h])
2
MRT = 72 hours (mean repair time [h])
Td_ESD = 730 hours
(diagnostic test interval of actuator monitoring (for safety function Safe ESD
[h])
Td_ESD_AVG = 365 hours (mean duration for failure detection))
Td_STOP = 0 hours (diagnostic test interval [h])
MTTR_ESD = 437 hours
MTTR_STOP = 72 hours
The following formula can be used for the calculation of the PFD
Table 9: SQ. 2 series with AC 01.2 actuator controls in SIL version
SQ 05.2 – SQ 12.2 / SQEx 05.2 – SQEx 12.2
Switchgear version: Contactors
Safety function
λ
S
1)
λ
DD
λ
DU
SFF
DC
PFD T = 1 Jahr (1001)
avg Proof
PFD T = 1 Jahr (1002)
avg Proof
SIL capability
1) including detected "annunciation" failures (λ
Table 10: SQ. 2 series with AC 01.2 actuator controls in SIL version
SQ 14.2 / SQEx 14.2
Switchgear version: Contactors
Safety function
λ
S
1)
λ
DD
λ
DU
SFF
DC
SQ 05.2 SQ 14.2/SQR 05.2
Safe ESD
185 FIT
821 FIT
213 FIT
82 %
79 %
3
2,15 x 10
4
2,03 x 10
SIL 2 (HFT = 0)
SIL 3 (HFT = 1)
) (failures in diagnostic function)
AD
Safe ESD
185 FIT
856 FIT
263 FIT
79 %
76 %
Part-turn actuators
SQR 14.2
values:
avg
Safe STOP
636 FIT
89 FIT
269 FIT
72 %
24 %
3
2,26 x 10
4
2,32 x 10
SIL 2 (HFT = 0)
SIL 3 (HFT = 1)
Safe STOP
675 FIT
89 FIT
309 FIT
71 %
22 %