Safe Torque Off 6-33
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
Comprehensive Check
A comprehensive check of the STO function ensures the overall integrity of the STO functionality. It proves the
independent operation of each individual channel (including during the normal dual channel operation), the STO
user feedback operation, and the essential single fault detection.
It must always be performed:
• During factory test
• During commissioning activities
• After repair or replacement of the 890
• After any hardware or software design changes which may affect the 890 concerned.
• After each intervention into the system and control wiring.
• At defined maintenance intervals as determined by the machine builder and /or user risk assessments and
associated verification assessments.
• If the machine has been idle for more than a period of time determined by the machinery builder and user
risk assessments.
• The check must be made by suitably qualified professional personnel following all necessary safety
precautions. They must be fully conversant with all equipment concerned.
NOTE: In the following text where it is required that “all power” is removed, this can be validated by ensuring
that the “STATUS” LED at the top of the control card and beneath terminal X10 goes and remains off (i.e., it is
not flashing).
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