Requirements
• 3RW55 soft starter
For the 3RW55 Failsafe soft starter, refer to chapter 3RW55 Failsafe soft starter (Page 343).
• If the soft stop function is set (stopping time setting element set to > 0 s) and the EMERGENCY
STOP circuit is tripped, a "Missing load" error message may be indicated on the 3RW55 soft
starter. Use Reset to reset the error message.
Basic conguration
If achievement of SILCL 1 according to IEC 62061 / PL c according to EN ISO 13849‑1 is required,
the series connection of an additional contactor with the 3RW55 soft starter, together with a
suitable safety relay (e.g.: 3SK1111), is required, as well as monitoring of the contactor's
auxiliary contacts.
① EMERGENCY STOP
② 3RT20 contactor
③ 3RW55 soft starter
④ Motor
⑤ 3SK1 safety relay
Example circuits
A.3 Special applications
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
336 Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
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