Example circuits
A.3 Special applications
SIRIUS 3RW52 Soft Starter
Equipment Manual, 04/2020, A5E35630451002A/RS-AE/005
237
A.3.3
EMERGENCY STOP shutdown to SIL 1 or PL c with a 3SK1 safety relay
The 3RW52 soft starter has no effect or influence on the safety function of the application.
For this reason, it is neither positively nor negatively considered in the safety application, and
also does not have to be included in the calculation for proof according to the standards.
Requirements
WARNING
Automatic restart.
Can cause death or serious injury.
If a starting command is pending, a restart will be triggered automatically after the reset.
This particularly applies if the motor protection has tripped. Dangerous states of the system
can result.
Reset the start command (e.g. via the PLC or switch) before performing a reset.
To do this, for example, link the group error output (terminals 95 and 96) into the control.
Tripping of the EMERGENCY STOP circuit
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" fault message may be indicated on the
3RW52 soft starter. In this case, the 3RW52 soft starter must be reset according to the
selected RESET MODE (Page 105).
