Connecting up, switching on
4.6 Terminal block X41 / switch S41
Power Module PM330
54 Hardware Installation Manual, 12/2018, A5E32844552B AF
Schematic diagram of the safety relay at X41
Figure 4-14 PM330 with safety relay, sensor and start button
Subdivision of the complete safety function into safety subfunctions is shown in the diagram
This example shows the safety function "Protection against restart when a protective device
is open".
This function is subdivided into the safety subfunctions:
● "Detect": Sensor, in this case, a cam-operated switch, which senses (detects) the position
of the protective device.
● "Evaluate": A 3SK11… safety relay is used for evaluation
– Evaluation and diagnostics of the sensor circuit
– Control of the SINAMICS PM330 subsafety function
– Diagnostics of the PM330 subsafety function
● "React": When activating the STO function at terminal strip X41 (low signal), the
torque/force-generating energy fed to the drive is interrupted, and the state of the safety
subfunction is signaled back to the safety relay.
Other application examples are provided in the annex to this document, see "Application
examples for functional safety (STO / SS1-t) (Page 121)".
Validating/checking the safety function
Carefully check/test the safety function after commissioning the system for the first time,
after carrying out any repairs and after each change to the machine/system.
These tests/checks must be performed by qualified personnel.
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