Emc And Esd Measures - Siemens SINUMERIK 840DiE sl Manual

EMC and ESD Measures

4.1 Interference suppression measures
Shielded
signal cables
Rules for routing
cables
!
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
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 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 lead.
In order to achieve the best possible noise immunity of the complete system
(control, power module, machine), the following EMC measures must be care-
fully observed:
S
Signal cables and load cables must be routed at the greatest possible
distance from one another.
S
Only use SIEMENS signal cables for connecting to and from the NC or PLC.
S
Signal cables may 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 (noise field) between the following leads should be as small as
possible:
– Signal cable and signal cable
– Signal lead and associated equipotential bonding lead
– Equipotential bonding lead and PE conductor (routed together).
Important
For further notes on interference suppression measures and the connection of
shielded cables, please refer to
References: /EMC/ EMC Directives.
4
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