Siemens SINUMERIK 840DE User Manual page 27

03.06
These external devices may not be connected to the control during normal op-
eration. 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.
Cable definitions
Definition:
S
S
Rules for routing
In order to achieve the best possible noise immunity of the complete system
(control, power module, machine), the following EMC measures must be care-
cables
fully observed:
S
S
S
S
S
S
S
Important
!
For further notes on interference suppression measures and the connection of
shielded cables, please refer to
References:
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D Configuring Manual NCU (PHD) – 03.06 Edition
Signal cables (example)
– Data cables (MPI, sensor cables, etc.)
– Binary inputs and outputs
– EMERGENCY OFF lines
Load cables (example)
– Low-voltage supply cables (230 V AC, +24 V DC etc.)
– Supply cables to contactors (primary and secondary circuit)
Signal cables and load cables must be routed at the greatest possible dis-
tance from one another.
If necessary, signal and load cables may cross one another (if possible, at
an angle of 90°), but must never be laid close or parallel to one another.
Only cables provided by the manufacturer should be used as signal cables
from and to the NCU.
Signal cables may not be routed close to strong external magnetic fields
(e.g. motors and transformers).
Pulse-carrying HC/HV cables must always be laid completely separately
from all other cables.
If signal lines cannot be routed a sufficient distance away from other cables,
they must be installed in grounded cable ducts (metal).
The clearance (interference injection area) between the following lines must
be kept to a minimum:
– Signal line and electrical circuit signal line (twisted)
– Signal line and associated equipotential bonding conductor
– Equipotential bonding conductor and PE conductor (routed together)
/EMC/ EMC Configuring Guidelines
2 Connection Conditions
2.1 Secondary electrical conditions
2-25