Siemens SINUMERIK 840D sl TCU 30.3 Equipment Manual page 18

Fundamental safety instructions
2.5 Residual risks of power drive systems
6. Influence of network-connected communication systems, e.g. ripple-control transmitters or
data communication via the network
7. Motors for use in potentially explosive areas:
When moving components such as bearings become worn, this can cause enclosure
components to exhibit unexpectedly high temperatures during operation, creating a hazard
in areas with a potentially explosive atmosphere.
For more information about the residual risks of the drive system components, see the
relevant sections in the technical user documentation.
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Equipment Manual, 03/2023, A5E40874197B AD
TCU 30.3