Page 17 - Safety engineering guidelines. Pneumatic and electric solutions

Basic HTML Version

17
Unintentional loosening of the
operating elements in the
adjusting device
Fault in the connecting component
(ripped off/out, leakage)
Clogging (blockage)
Bending
Change to the recording and
output characteristics
Failure of the end-position
cushioning
Loosening of the piston/
piston rod connection
Pressure rise
Pressure failure
Electrical power failure
DC 1 =
(Recognised
dangerous errors)
(Total dangerous
errors)
+
+ ... +
+
+ ... +
Key
Not relevant for this
component
Freedom from errors
(see DIN EN ISO 13849-2)
No error freedom
guaranteed for this
component
DC average
DC avg =
DC
1
DC
2
DC
N
MTTF
d1
MTTF
d2
MTTF
dN
1
1
1
MTTF
d1
MTTF
d2
MTTF
dN