power automation PA 8000 EL, Руководство по установке, Страница: 70 / 108

Reference potential and ground of all electrical operating supplies
n Installation parts and cabinets with your CNC control unit have
to be connected in star topology with the isolation/protected
ground conductor system to avoid ground loops.
n Sufficiently dimensioned potential compensation lines have to
be laid if there are potential differences between installation
parts and cabinets
Area-wide grounding of the inactive metal parts
n A central connection between the ground and the protected
ground conductor system have to be installed.
n All inactive metals have to be connected extensively and impe-
dance-low.
Fixing of the cable shield
n Data cables and analog cables must be laid separately from
each other.
n The cable shield has to be laid extensively on a protected
ground conductor rail directly after the cabinet entry and the fix-
ation of the shield with cable clamps.
n The isolation / protected ground rail has to be connected impe-
dance-low with the cabinet.
n The metallic or metallized plug cases for shielded cables must
be used.
n When transmitting signals with small amplitudes the one sided
grounding of the cable shield may be favorable.
Electromagnetic interferences may interfere with the control unit:
n Electromagnetic fields (RF coupling)
n Magnetic fields with power frequency
n Power supply
n Protected ground conductor
n Superbus system
Depending on the spreading medium and the distance to the inter-
ference cause, interferences to the control unit occur by means of
capacitive, galvanic, inductive or radiant coupling mechanisms.
Possible Interferences
PA 8000 EL CNC control unit
Technical data
24.09.2015 | 70