8 STO (safe torque off)
8.9
Functional test, validation
The STO function must be validated after the installation or after the installation has been
changed.
This validation must be documented by the person performing the commissioning
process. To assist you with the commissioning process, section 15
provides example checklists with questions for a risk reduction. However, these
checklists are no substitute for safety training. No guarantee can be provided for the
completeness of the checklists.
8.10
Operation
Obligations of the owner/operator
The safety system must be checked for correct operation at appropriate intervals. It is the
responsibility of the owner/operator to choose the type of check and the time intervals in
the specified time period. The check is to be conducted such that the correct operation of
the safety system can be verified based on an interaction of all of the components.
Maintenance and care
The BL 4100-C servo drive with an integrated STO function is maintenance-free.
8.11
Diagnostics and fault clearance
The servo drive indicates the safe state as well as error messages by way of its seven-
segment display. See section 4.2
Operating mode and error indication
STO-based fault messages
Error messages that are issued with regard to the functional safety system have error
numbers from 51 to 52. These messages are described in the error table.
If an error message cannot be acknowledged, its cause must be remedied by applying the
recommended measures. Then, reset the servo drive and check whether the cause of the
error, and the error message, have been eliminated.
Product manual BL 4000-C
Page 207 of 298