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© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
EMC and ESD Measures
4.1 RI suppression measures
To ensure safe, interference-free operation of the installation, it is essential to
use the cables specified in the individual diagrams. Both ends of the shield must
always have a conductive connection to the housing.
Exception:
S If non-Siemens devices are connected (printers, programming devices, etc.),
you can also use standard shielding cables which are connected at one
end.
These external devices may not be connected to the control during normal
operation. However, if the system cannot be operated without them, then the
cable shields must be connected at both ends. Furthermore, the external
device must be connected to the control via an equipotential bonding cable.
The following EMC measures must be followed to ensure maximum immunity to
interference in the overall plant (control, power section, machine).
S The signal and load cables must be kept as far apart as possible.
S Only original SIEMENS cables should be used as the signal cables from
and to the NCK and PLC.
S Signal cables must not be routed close to strong external magnetic fields
(e.g. motors and transformers).
S Pulse-carrying HC/HV cables must always be laid completely separately
from all other cables.
S If signal cables cannot be laid at a sufficient distance from other cables, then
they must be installed in shielded cable ducts (metal).
S The distance (interference liability surface) between the following cables
must be kept to a minimum:
– Signal cable and signal cable
– Signal cable and associated equipotential bonding conductor
– Equipotential bonding conductor and PE conductor (routed together)
!
Important
For further notes on noise suppression and the connection of shielded cables,
see
Reference material: /EMV/ Configuration Guide, EMC installation guidelines
Shielded signal
cables
Construction rules
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