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A.3.8
EMERGENCY STOP shutdown to SIL 1 or PL c with a 3SK1 safety relay
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.
The 3RW55 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.
If achievement of SILCL 1 according to IEC 62061:2005 / PL c according to
EN ISO 13849-1:2015 is required, the series connection of an additional contactor with the
3RW55 soft starter, in conjunction with a suitable safety relay (e.g.: 3SK1111), is required,
as well as monitoring of the contactor's auxiliary contacts.
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
WARNING
Example circuits
A.3 Special applications
229
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