Connecting Pre-Processing Devices - Siemens SINAMICS G120 Function Manual

Installing
4.3 Activation via F-DI
4.3.2.2

Connecting pre-processing devices

If you use safety relays with electronic enabling circuits, the relays must feature outputs that
switch to P potential. The safety relay switches the 24 V supply line to the converter but not
the ground return line.
Safety relays with relay enabling circuits are only permitted if, as a minimum, they have an
internal two-channel configuration.
The following pages describe a number of typical circuits for various types of safety relay.
Exactly how these are interconnected depends on whether the safety relay and the converter
are housed in the same or separate control cabinets.
3TK28 safety relay
The typical circuits described on the following pages are based on safety relays with relay
enabling circuits. Safety relays with semiconductor enabling circuits can also be used.
The diagrams only show how the safety relay and inverter are interconnected. Information
providing full details of how the safety relay is wired can be found in the product-specific
documentation: SIRIUS 3TK28 safety relays
(http://support.automation.siemens.com/WW/view/en/26414637/133300).
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Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA