Foreseeable Misuse; Safety Function In Accordance With En Iso 13849 - Festo VOFA-L26-T32C-M-G14-1C1 Series Operating Instructions Manual

VOFA-L26-T32C-M-G14-1C1-…
– Use only in standard operation: This also includes rest, set-up and service operation, as well as
emergency operation.
– Use only within the limits of the product defined by the technical data (è Chap. 13)
– Use only in its original status without unauthorised modifications (exceptions è Chap. 11) and in
perfect technical condition
1.3

Foreseeable misuse

Note
In the event of damage caused by unauthorised manipulation or other than intended
use, the warranty is invalidated and the manufacturer is not liable for damages.
The following foreseeable misuses are among those not approved as intended use:
– use outdoors
– bypassing the safety function
– omission of both the evaluation of the sensor signal change for each valve switching procedure and
a comparable measure for diagnostics
– use in reversible operation (reversal of supply and exhaust air)
– operating mode with low demand mode according to IEC 61508
– vacuum operation
1.4

Safety function in accordance with EN ISO 13849

The control block has been developed and manufactured in accordance with the corresponding basic
and proven safety principles of EN ISO 13849-2. The control block exhibits structural properties which
enable Performance Level e/category 4 to be achieved for implementation of the safety function
The operator is responsible for specification of the safety function. The safety function "safe venting"
depends on the following factors:
– standard flow rate with exhaust of the control block including silencer
– volume of the area to be exhausted
– pressure of the area to be exhausted
– switching times when switched off (è Chap. 7.3)
The achievable safety level depends on the other components used to achieve a safety function.
The following requirements apply to the operator:
– The specifications on mounting and the operating conditions in these operating instructions must
be observed.
– For use in higher categories (2 to 4), the requirements of EN ISO 13849-1 (with regard to DC and
CCF) must be taken into account.
– The solenoid valves must be switched at least once per week to ensure the intended use.
38 Festo – VOFA-L26-T32C-M-G14-1C1-… – 1505a English
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