Ss1 According To Stop Category 1; Ss1 Direct Stop - BONFIGLIOLI Agile Applications Manual

10.2 SS1 according to Stop Category 1

10.2.1

SS1 Direct Stop

The Application example shows the minimum circuitry for Agile Frequency inverter for realization of the
safety function Safe Stop 1 (SS1) with an emergency stop device in a common electrical cabinet accord-
ing to EN ISO 13849-1 PL d and Category 3 or IEC 61508 SIL 2.
When the emergency stop device is actuated, the travel command "Clockwise" is reset first. After a
delay t , the contacts on the safety switch interrupt the two enable paths STOA and STOB of the Agile
v
frequency inverter and the integrated safety function is triggered. The delay time is set on the safety
control device and must be selected according to the application. The set delay time has to be slightly
higher than the shut down time.
A (non-safe) feedback to a process controller can be effected, for example, via a connected field bus.
If STO is requested, the overriding controller has no more influence on the inverter release in the
frequency inverter.
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