Configuration options for safety function
Table 4: Configuration options for safety function
Initiated byShort descriptionConfiguration
SIL function
ESD or mains failureESDSafe CLOSINGSafe ESD CLOSE
ESD or mains failureESDSafe OPENINGSafe ESD OPEN
––Signal is issued whether one of both
end positions (OPEN/CLOSED) is
reached.
Safe end position
feedback
3.3. Further notes and indications on architecture
●
Systematic capability is SC03
●
For redundant system architecture, a common cause failure (CCF) of 10 % is
to be assumed, except if the analysis shows, that a lower CFF can be applied.
●
This is a type A device.
●
When using a fail safe unit, HFT = 0.
●
Required diagnostic measures (refer to page 11, Safety instrumented system
including an actuator).
3.4. Applications (environmental conditions)
When specifying and using the actuators and the fail safe unit within safety
instrumented systems, make sure that the permissible service conditions and the
EMC requirements by the peripheral devices are met. Service conditions are indicated
in the technical data sheet.
●
Enclosure protection
●
Corrosion protection
●
Ambient temperature
●
Vibration resistance
If the actual ambient temperatures exceed an average of +40 °C, the lambda values
have to be incremented by a safety factor. Refer to <Specific figures for fail safe unit
in SIL version with actuators of SQ .2 series> chapter.
For environmental testing, the fail safe unit was subjected to tests according to the
following standards:
●
Dry heat: EN 60068-2-2
●
Damp heat: EN 60068-2-30
●
Cold: EN 60068-2-1
●
Vibration (sinusoidal): IEC 60068-2-6
●
Degree of protection test IP68: EN 60529
●
Immunity level: EN 61000-6-7
●
Emission: EN 61000-6-4
10
Architecture, configuration and applications with non safety-related actuators
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