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Entry type: FAQ Entry ID: 66004980, Entry date: 11/28/2012

Safe switching of IO-Link motor starter combination 3RA27 with safety relay 3SK1

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How can you operationally switch the function module 3RA27 via IO-Link and additionally guarantee safe switching in case of an emergency?





The function module is operationally switched and powered via IO-Link. Additionally an auxiliary voltage for the contactor below to switch is required. By interrupting that auxiliary power supply as for example by an interconnected safety relay 3SK1 and a two-channel emergency stop commanding device, the contactor will switch off according to stop category 0 described in IEC 60204-1.
The use of a redundant contactor and the monitoring of the feedback circuit will allow the application to reach up to SIL 3 according to IEC 62061 or PL e according to ISO 13849-1.

 FAQ_66004980_Safe_switching_3SK1_3RA27_en.pdf (196 KB) ( 196 KB )




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Application Examples, Functional Examples, SIRIUS Safety, Wiring Example