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 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
EMC / ESD Measures
4.1 Measures to suppress interference
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 be conductively connected to the equipment housing.
Exception:
S If external equipment (such as printers, programming devices, etc.) is
connected, standard shielded cables connected at one end may also be
used.
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 lead.
To ensure that the entire installation (control, power section, machine) has the
greatest possible immunity to interference, the following EMC measures must
be taken:
S Signal leads and load leads must be routed at the greatest possible distance
from one another.
S Signal cables from and to the NC or PLC must be supplied by SIEMENS.
S Signal leads must not be routed close to strong external magnetic fields
(e.g. motors and transformers).
S Pulse-carrying HC/HV leads must always be laid completely separately from
all other leads/cables.
S If signal leads cannot be laid at a sufficient distance from other leads, then
they must be installed in shielded cable ducts (metal).
S The distance (noise field) between the following leads should be as small as
possible:
– Signal lead and signal lead.
– Signal lead and associated equipotential bonding lead.
– Equipotential bonding lead and PE conductor (routed together).
!
Important
For more information about interference suppression measures and connection
of shielded cables, please refer to
References: /EMC/, EMC Guidelines
Shielded
signal leads
Precautionary
measures
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