Fagor DDS Series Hardware Manual page 321

9.7 Technical data of the safety functions
To calculate the machine's P erformance L evel (PL of EN ISO 13849-1)
and/or S afety I ntegrated L evel (SIL of IEC 62061), use the drive data
provided in the following tables:
T. H9/1 Calculation data according to EN ISO 13849-1.
T ( M ission T ime of the drive)
M
PL ( P erformance L evel)
MTTFd ( M ean T ime T o d angerous F ailure)
DCavg (Average D iagnostic C overage)
CCF (score of measures against C ommon
C ause F ailure)
B (average number of cycles until 10% of
10d
the components suffers a dangerous failure)
Category
1
See Mission times in 9.11 Maintenance, repair and analysis of hazardous
events .
T. H9/2 Calculation data according to IEC 61508 and IEC 61800-5-2.
T ( M ission T ime of the drive)
M
SFF ( S afe F ailure F raction)
PFH ( P robability of F ailure per H our)


 D angerous U ndetected failures)
DU (
HFT ( H ardware F ault T olerance)
SIL ( S afety I ntegrity L evel)
1
See Mission times in 9.11 Maintenance, repair and analysis of hazardous
events .
note 1
 The SFF, PFH, MTTFd and DCavg data for STO are calculated
considering a - KM1 contactor with B10d = 1 300 000 life cycles and
demand of the STO safety function every 10 minutes, running 24 hours
a day.
note 2
See Probabilities of dangerous failure. PFH and MTTFd in 9.11
Maintenance, repair and analysis of hazardous events .
note 3
The external main contactor - KM1 installed must comply with standard
IEC 60947-4-1 (if it is a mirror-contact type) or with IEC 60947-5-1 (if its
contact is joined mechanically).
High demand
The safety functions of the drive have been designed to be used in high
demand mode (at least once a year) according with regulation IEC 61800-5-
2.
1
years 20
d
years 247
%
90
80
cycles 10 000 000
3
1
years 20
% 94
1/h 1,3 E-09
1/h 4,6 E-08
1
2
   Functional safety
9.
DDS
HARDWARE
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