30 AGL-STOV0-01SV0-05
06/12
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 according 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
v
, the contacts on the safety switch interrupt the two enable
paths STOA and STOB of the Agile frequency inverter and the integrated safety func-
tion is triggered. The delay time is set on the safety control device and must be se-
lected 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 influ-
ence on the inverter release in the frequency inverter.
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