Tests And Maintenance; Safety Equipment: Check; Internal Actuator Monitoring With Control Via Standard Controls; Partial Valve Stroke Test (Pvst): Execute - AUMA SA3 Manual

Multi-turn actuators
SA series with Control 3.XX /NI/SIL
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Tests and maintenance

Information
8.1

Safety equipment: check

8.2

Internal actuator monitoring with control via standard controls

8.3

Partial Valve Stroke Test (PVST): execute

Test and maintenance tasks may only be performed by authorised personnel who have been
trained on functional safety.
Test and maintenance equipment has to be calibrated.
Any test/maintenance must be recorded in a test/maintenance report. Impact of
testing/maintenance on relevant devices, equipment or other work must be evaluated.
All safety functions within a safety equipment must be checked for perfect functionality and
safety at appropriate intervals. The intervals for safety equipment checks are to be defined by
the plant operator.
The plant operator has to establish a safety schedule for the entire safety lifecycle of the SIS
to avoid systematic faults. Policies and strategies for achieving safety as well as different
activities during the safety life cycle should be defined.
The device, consisting of actuator with actuator controls and integral SIL module has an
internal actuator monitoring. By controlling standard controls/actuator via standard operation
commands, internal actuator monitoring is automatically performed. Internal actuator
monitoring identifies most of the safety-related actuator components. If a fault occurs, the
fault would be signaled via the output contact of the SIL module (SIL failure).
To ensure the safety figures of the Safe ESD safety function, the device has to be controlled at
least once per month via the standard controls, including output contact assessment of the
SIL module (SIL failure). If it cannot be ensured that the device is controlled by the
standard controls at least once per month, a <Partial Valve Stroke Test (PVST)> has to be
performed instead.
The control signal and the pertaining operation of the actuator have to be present for at least 4
seconds. If control signal and pertaining operation of the actuator are present for at least 4
seconds without signaling a fault via the SIL output contact (SIL module: SIL failure), the
test was successful. Otherwise, the device has to be checked in accordance with the steps in
the <Proof test: execute> chapter.
— Option —
There are two options for performing the PVST.
1. Performing the PVST using safe inputs Safe ESDa and Safe ESDb: The PVST
must be controlled by the external safety PLC. The safety PLC uses safe inputs Safe
ESDa and Safe ESDb. Desired diagnostics is performed by evaluating the SIL output
contact (SIL module: SIL
operation have to be present for at least 4 seconds. The test is successfully passed if
both control signals and the pertaining actuator operation are present for at least 4
seconds without fault signal from the SIL output contact (SIL module: SIL failure).
Otherwise, the device has to be checked in accordance with the steps indicated in the
<Proof test: execute> chapter.
2.
Performing the PVST using the PVST function of 3.XX /NI/SIL: If standard controls
of 3.XX /NI/SIL are configured with PVST input, this input can be used for diagnostics
of the safety relevant part of the controls under certain conditions.
failure). Both control signals and related actuator
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