safety requirements (EHSR) of the Machinery Directive are fulfilled. The requirements in
the applicable standards must also be met and the safety module must be used according
to all instructions provided in this manual.
Responsibilities
ABB as a component manufacturer is only responsible of the safety and conformity of their
manufactured products, not of the systems, where these products are used.
If you detect any failure in safety functions, contact your local ABB representative.
Intentional misuse
Use the safety module according to the instructions given in the user’s manual. ABB is not
responsible for any damage caused by the misuse of the module.
The module is not designed to protect a machine against intentional misuse or sabotage.
Safety-related parts
The safety module and the drive Safe torque off (STO) channel/function are safety relevant,
and the rest of the drive is considered as not safety relevant, for example, the drive regular
I/O cannot be used for requesting safety functions on the safety module.
Limitations of Safe torque off (STO) function
The Safe torque off function can be used for stopping the drive in the operational mode. If
a running drive is stopped by using the STO function, the drive stops by coasting. STO
function can also be used for prevention of unexpected start-up according to the limitations
of IEC 60204-1, 5.4 and ISO 14118.
The Safe torque off function does not disconnect or isolate the voltage of the main and
auxiliary circuits from the drive. Therefore maintenance work on any electrical parts of the
system (including drive and the motor) can only be carried out after proper isolating
procedure, which must be followed to make sure that the maintained part of the system is
properly isolated.
Overall system stopping performance
A safety function always consists of other components in addition to FSPS-21. The overall
safe stopping time of the entire system must be according to the requirements of the risk
assessment. This means that the dangerous movement of the machine must be stopped
before any dangerous situation can occur.
Safety function response time and the FSPS-21 module response times are specified in
section Response times (page 195).
22 Safety system information and considerations
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