Maintenance
After the operation of the circuit is validated at start-up, the STO function shall
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 10 years; see section
. It is
assumed that all dangerous failures of the STO circuit are detected by the proof
test. To perform the proof test, do the
Validation test procedure (page 418)
Note: See also the Recommendation of Use CNB/M/11.050 (published by the
European co-ordination of Notified Bodies) concerning dual-channel safety-related
systems with electromechanical outputs:
•
When the safety integrity requirement for the safety function is SIL 3 or PL e
(cat. 3 or 4), the proof test for the function must be performed at least every
month.
•
When the safety integrity requirement for the safety function is SIL 2 (HFT =
1) or PL d (cat. 3), the proof test for the function must be performed at least
every 12 months.
The STO function of the drive does not contain any electromechanical components.
In addition to proof testing, it is a good practice to check the operation of the
function when other maintenance procedures are carried out on the machinery.
Include the Safe torque off operation test described above in the routine
maintenance program of the machinery that the drive runs.
If any wiring or component change is needed after start-up, or the parameters are
restored, do the test given in section
Validation test procedure (page 418)
Use only spare parts approved by ABB.
Record all maintenance and proof test activities in the machine logbook.
■
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.
422 The Safe torque off function
Summary of Contents for ACS580 Series
Page 1: ...ABB GENERAL PURPOSE DRIVES ACS580 01 drives Hardware manual...
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