Siemens SINAMICS S120 - Grounding Concept;Electromagnetic Compatibility (EMC)

Configuration
3.4 Interconnection
Hydraulic Drive
52 System Manual, 04/2015, 6SL3097-4BA00-0BP1
3.4.3
Grounding concept/Electromagnetic compatibility (EMC)
The maximum power loss of the SINAMICS S120 HLA in the control cabinet is approx.
12 W.
In the HLA module, the M input of the 24 V power supply (X224), the M input of the 26.5 V
power supply as well as the internal ground are connected with one another and to the
enclosure.
The switch-on and switch-off sequence of the 24 V electronics power supply and the 26.5 V
power supply for the hydraulics is in principle arbitrary; however, naturally various responses
are obtained depending on the sequence.
Taking into account the current load capacity and the voltage tolerances, the electronics in
the HLA module can also be supplied from the 26.5 V power supply; however, frequently this
does not make sense as a result of the cable routing and/or the voltage drops.