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+Q964 Maintenance
After the operation of the circuit is tested at start-up, it does need scheduled maintenance testing
during its specified lifetime depending on its usage.
In addition to proof testing, it is a good practice to check the operation of the function when other
maintenance routines of the machinery are carried out.
If you change any wiring or component after the start up, or restore parameters to their default values:
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Use only ABB approved spare parts.
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Register the change to the change log for the safety circuit.
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Test the safety function again after the change.
Follow the rules given in section
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Document the tests and store the report into the logbook of the machine.
Proof test interval
After the operation of the safety function is validated at start-up, the safety function must be
maintained by periodic proof testing. In high demand mode of operation, the maximum proof test
interval is 20 years. In low demand mode of operation, the maximum proof test interval is one year (high
or low demand as defined in IEC 61508, EN/IEC 62061 and EN ISO 13849-1).
Diagnostic test interval
Regardless of the mode of operation, it is a good practice to check the operation of the safety function
at least once a year. Do the test as described in section +Q952 Start-up and acceptance test on page 15.
The person responsible for the design of the complete safety function should also note the
Requirements from IEC61800-5-2:2016 / EN61800-5-2:2017 for the drives STO circuit:
6.2.2.1.4: Diagnostic test interval when the hardware fault tolerance is greater than zero
The diagnostic test interval of any subsystem of the PDS (SR) shall be appropriate to meet the
required PFH (see 6.2.2.1.1).
NOTE 2: For redundant parts of a PDS (SR) which cannot be tested without disrupting the
application in which the PDS (SR) is used (machine or plant) and where no justifiable technical
solution can be implemented, the following maximum diagnostic test intervals can be considered
as acceptable:
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one test per year for SIL 2, PL d / category;
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one test per three months for SIL 3, PL e / category 3;
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one test per day for SIL 3, PL e / category 4 (not applicable).
PL and category according to ISO 13849-1.
The noted DC Values are taken from SS-EN ISO 13849-1:2016 (E) chapter 4.5.3.
Regardless of the mode of operation, it is a good practice to check the operation of the safety function
at least once a year. Do the test as described in section +Q952 Start-up and acceptance test on page 15.
Competence
The maintenance and proof test activities of the safety function must be carried out by a competent
person with adequate expertise and knowledge of the safety function as well as functional safety, as
required by IEC 61508-1 clause 6.
Residual risk
The safety functions are used to reduce the recognized hazardous conditions. In spite of this, it is not
always possible to eliminate all potential hazards. Therefore the warnings for the residual risks must be
given to the operators.
+Q964 Startup and acceptance test
3ADW000508R0201+Q964 E-Stop cat.1 without opening mains contactor en b
on page 15.
Option description and instructions
19
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