●
The actuator has unseated from this end position during the PVST.
●
At the end of the PVST, the actuator is in the same end position as prior to the
PVST.
●
The FS module has not signalled a fault via the output contact (FS ready
NO/FS failure NC).
If this is not the case, the device has to be checked in accordance with the steps in
the <Proof test> chapter.
Information
If several end position switches (LSC NO, LSC NC, LSO NO, LSO NC) are used
for safe end position feedback, check for all end position switches used, whether
they indicate correctly the sequence shown here.
We also recommend assessing PVST fault (953) and PVST abort (954) signals of
the actuator controls. Assessment must not necessarily be performed by the safety
PLC.
8.4. Proof test (verification of safe actuator function)
The proof test serves the purpose to verify the safety-related functions of the actuator
and actuator controls.
Proof tests shall reveal dangerous failures which might remain undetected until a
safety function is started and consequently result in a potential danger.
Information During execution of the proof test, the safety function is unavailable for a short time.
Prior to starting the proof test procedure/procedures described before, the preliminary
tests below must be performed.
●
Visual inspection for excessive corrosion and possible damage.
●
Checking and if required tightening all screws used in the connection between
FQM fail safe unit and SQ part-turn actuator. Tightening torque: FQM 5.1/7.1:
24 Nm, FQM 10.1/12.1: 82 Nm
Depending on both version and configuration, the proof test includes the
following tests:
1. Check Safe ESD safety operation (Safe OPENING/CLOSING)
2. Check fail safe fault signal.
3. Check Safe ESD reaction to “safe end position feedback” (assessment of end
position switch).
The safety-related signal input is appropriately assigned to check the safety-related
function. As a consequence, the actuator has to perform the safety function. For a
detailed description of the proof test steps, please refer to the following sections.
Intervals:
A proof test interval describes the time between two proof tests. Functionality must
be checked at appropriate intervals. The intervals are to be defined by the plant
operator.The safety-related figures depend on the selected proof test interval (refer
to page 36, ).
In any case, the safety-related functions must be checked after commissioning and
following any maintenance work or repair after changing the fail safe operating time
as well as during the T
proof
intervals defined in the safety assessment.
If a fault occurs during proof test, safe function has to be ensured introducing
alternative actions. Please contact AUMA Riester GmbH & Co. KG.
The type of proof test to be performed depends on version and configuration of the
product. Only the tests applicable have to be performed.
Information Before starting the test, we recommend reading the respective test procedure at
least once.
8.4.1. Check ESD operation (Safe OPENING/CLOSING)
Configuration
The test is valid for all versions with Safe ESD function.
Test procedure
A safety operation in direction of the configured fail safe position must be triggered.
24
Tests and maintenance with non safety-related actuators
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