WARNING
Loss of the safety function due to restricted diagnostics.
Can cause death or serious injury.
For diagnostics, the 3RW55 Failsafe soft starter must always be directly connected to the main
supply voltage (operational voltage).
For diagnostics, always connect the 3RW55 Failsafe soft starter directly to the main supply
voltage (operational voltage). Additional contact elements (e.g. a redundant contactor) must
only be connected in series behind the 3RW55 Failsafe soft starter.
Note
Compliance with the maximum permissible switching cycles
The safety values only apply considering the maximum permissible switching cycles (B10) of the
switching devices used.
• SIL1 application: B10 of the soft starter
• SIL3 application: B10 of the soft starter and B10 of the downstream contactor
Note
Function test
In continuous operation, the key safety values apply in the case of a function test interval for
SIL 1 ≤ 1 year and for SIL 3 ≤ 1 month. The function check is part of the self-test (user-test)
(Page 264).
Note
Protection from restarting
Note that, after a safety-related shuto, an automatic restart cannot be performed.
You will nd further information on safety-related shuto in chapter Failsafe (Page 212).
Note
Cross-circuit proof/short-circuit to power cable proof cable installation
PL e / Cat. 4 according to EN ISO 13849‑1 or SILCL 3 according to IEC 62061 can only be achieved
with cross-circuit proof/short-circuit to power cable proof cable installation between the safety
relay (SIL ≥ 2) and the 3RW55 Failsafe soft starter or motor contactor (e.g. as cables in separate
jackets or in a separate cable duct):
• From the safe output of the safety relay to the failsafe digital input F‑DI of the 3RW55 Failsafe
soft starter.
• From the failsafe signaling output (output 41, 42; output 4) of the 3RW55 Failsafe soft starter
to the safe input of the safety relay.
• From the safe output of the safety relay to operate the motor contactor.
Example circuits
A.4 3RW55 Failsafe soft starter
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
344 Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
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