Siemens SINAMICS S120 Manual - Página 6

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SINAMICS S120 Fail-Safe Drives

Task description

The extended safety functions integrated in the SINAMICS S120 drives are

to be controlled from a TM54F via hardware signals. The drives belong to

different drive groups. The safety-relevant logical pre-processing of the

input signals is handled in an F-CPU.

This application should comply with SIL 2 acc. to EN 62061:2005, ISO

13849-1:2006 PL d or EN 954-1:1996 Category 3.

Solution

Hardware overview

The control of the safety functions SS1 and SLS via the TM54F terminal

expansion module connected to a SINAMICS S120 drive group is shown in

this function example. The SLS initiates a Stop C (SS2 → SOS) as re-

sponse to the fault at the particular drive.

The drive group in the booksize format comprises an infeed and a Double

Motor Module. The motor is controlled using a CU320 Control Unit. The ex-

panded setpoint channel is used to enter the speed setpoint. The two ser-

vomotors – that are independent of one another – are controlled by the

Double Motor Module. A Smart Line Module is used as infeed.

The safety-relevant signals are detected using the fail-safe inputs of an F-

CPU and are then evaluated in the F-CPU. The pre-processed signals are

transferred to the TM54F terminal expansion module via the fail-safe

outputs of the F-CPU. This means that the safety functions integrated in the

drive are controlled in the SINAMICS S120.

I DT Safety Integrated

Page 6/43

Entry ID: 28424136

MC-FE-I-005-V11-EN