Siemens SIRIUS 3SK1 Manual page 182

Configuration / operation
10.2 Explanation of the device's functions
When using a 3SK1 safety relay with instantaneous and time-delayed contacts, the two following
safety notes must always be observed:
NOTICE
In the event of external faults such as:
• Cross-circuit fault
• Short circuit to ground
• Current-source short circuit
and to access the configuration mode for copying a delay time after a reset, the following
device behavior must always be taken into account:
The outputs of stop category 0 switch instantaneously, while the outputs of stop category 1
have a time delay.
The sequence cannot be interrupted.
Exception: Switching off the power supply.
NOTICE
If the safe state is restored during the time delay, (e.g. the protective door is closed) and
the START button is actuated, the enabling circuits switch to the active position
immediately after the delay time has elapsed. The actuation of the START button is saved.
NOTICE
Observe the following in the case of protective doors with tumblers:
If the voltage Us is disconnected on devices with time-delayed outputs between switching
the instantaneous outputs and the time-delayed outputs, the delay time expires when the
voltage Us is restored, and the time-delayed contacts change their switch positions.
182
Manual, 04/2013, A5E02526190021A/RS-AA/01
3SK1 safety relays