Parker AC890PX Series, Product Manual

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4-33
Safe Torque Off
AC890PX AC Drive
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).