426 Appendix: Safe torque off (STO)
Fault tracing
The indications given during the normal operation of the Safe torque off function are
selected by parameter 3025 STO OPERATION.
The diagnostics of the Safe torque off function cross-compare the status of the two
STO channels. In case the channels are not in the same state, a fault reaction
function is performed and the drive trips on an “STO hardware failure” fault. An
attempt to use the STO in a non-redundant manner, for example activating only one
channel, will trigger the same reaction.
For the indications generated by the drive, see chapter
, and for details
on directing fault and warning indications to an output on the control unit for external
diagnostics.
Any failures of the Safe torque off function must be reported to ABB.
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...