Maintenance and fault tracing 33
Maintenance and fault tracing
Contents of this chapter
This chapter describes the maintenance procedure, required competence for maintenance
personnel and fault tracing information for the Safe torque off function.
Maintenance
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/inverter runs.
If any wiring or component change is needed after start up, follow the test given in section
Acceptance test procedure (page 30).
Use only spare parts approved by ABB.
Record all maintenance and proof test activities in the machine logbook.
Proof test interval
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 2 years (high or low demand as defined in IEC 61508, EN/IEC 62061 and
EN ISO 3849-1). The test procedure is given in section Acceptance test procedure
(page 30).
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