Functional safety
13.5 Application examples
SINAMICS DCM DC Converter
714 Operating Instructions, 12/2018, A5E34763375A
Note
Response time of the STO function
The STO safety function in the DC master is designed for a 250
ms response time.
dant switch-off signal path via the contactor/circuit breaker must also be
ms response time.
In six application examples (see the following figures), the safety functions STO and SS1 are
shown for applications with a safety relay and a contact block (line contactor and circuit
breaker) to safely shut down the armature circuit (first channel):
● STO application with line contactor
● STO application with circuit breaker
● SS1 application with line contactor
● SS1 application with circuit breaker
● SS1 application with line contactor and F-PLC
● SS1 application with circuit breaker and F-PLC
Description of the applications
The SINAMICS DCM is activated and evaluated in all four application examples each with a
2-channel EMERGENCY STOP trigger mechanism (e.g. EMERGENCY STOP button, safety
door switch, etc.) via an additional
(green block).
● STO application:
3SK1121-2AB40 safety relay
● SS1 application:
Safety relay 3SK1121-2CB42 (with the option to set a delay time for quick stop)
Via the corresponding terminals of the safety relay, the
and the
feedback circuit
RM1 / RM2
of
DCM (red block, SAFETY circuit, second channel) are wired via
the contacts of the contact blocks (blue block, line contactor or circuit breaker, first channel).
● For applications with line contactor, the feedback circuit is routed via
of the
.
● For applications with circuit breaker, the feedback circuit is routed via the undervoltage
coil
of the
.
In addition,
(terminals 106, 109, 110) and the 24V input
(terminal X177.9) of
the Power Interface are guided in
via the safety relay.
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