power automation PA 8000 LW Series, Руководство по установке, Страница: 89 / 132

Cabling
n The cabling must be in line groups (high voltage, current supply,
signal and data lines)
n High voltage lines and signal respectively data lines must be laid in
separate channels or bundles
n The signal and data lines have to be routed as near as possible
beside ground areas
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 fixation 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 interfer-
ence cause, interferences to the control unit occur by means of capaci-
tive, galvanic, inductive or radiant coupling mechanisms.
Important Rules For EMC
Possible Interferences
PA 8000 LW CNC control unit
Technical data
25.09.2015 | 89