Application Examples; Description Of The Applications - Siemens SINAMICS Series Operating Instructions Manual

Functional safety

13.5 Application examples

13.5 Application examples
Note
Response time of the STO function
The STO safety function in the DC master is designed for a 250 ms response time.
The external redundant switch-off signal path via the contactor/circuit breaker must also be
designed for a 250 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 3SK1121 safety relay (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 STO input and the feedback circuit
RM1 / RM2 of SINAMICS 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 contacts A1 and A2
of the line contactor KA1.
● For applications with circuit breaker, the feedback circuit is routed via the undervoltage
coil U< of the circuit breaker 3WL.
In addition, E-STOP (terminals 106, 109, 110) and the 24V input P24 (terminal X177.9) of
the Power Interface are guided in SINAMICS DCM via the safety relay.
714
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A