Emc And Esd Measures - Siemens SINUMERIK 840Di Manual

EMC and ESD Measures

4.1 Interference suppression measures
Shielded
signal cables
Installation rules
!
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Only use the cables specified in the individual diagrams to ensure safe
interference-free operation of the system. Generally, the shield must be
conductively connected to the housings on both ends.
Exception:
S
If third-party devices are connected (printer, programming devices etc.), it is
also possible to use standard shield cables connected to the housing to one
end only.
These devices, however, may not be connected to the control system during
normal operation. If the operation of third-party devices is inevitable, the
shields must be connected to both ends. In addition, the third-party device
must be connected to the control system using an equipotential bonding
conductor.
In order to achieve maximum noise immunity of the whole system (control
system, power section, machine), observe the following EMC measures:
S
Observe maximum clearance between signal and load cables.
S
Use only the cables offered by SIEMENS as the signal lines from and to the
NC or PLC.
S
Make sure that the signal lines have a sufficient clearance from strong
magnetic fields (e.g. motors and transformers).
S
Pulse-loaded high-current/high-voltage cables must always be routed
completely separated from any other cables.
S
If a sufficient clearance is not possible, signal lines must be routed in
shielding cable channels (metal).
S
Make sure that the distance (interference injection area) between the cables
listed below is as low as possible:
– Signal line and signal line
– Signal line and appropriate equipotential bonding conductor
– Equipotential bonding conductor and appropriate protective conductor.
Important
For further notes on interference suppression measures and the connection of
shielded cables, please refer to
References: /EMV/ EMC Installation Guide.
4
4-135