Ri Suppression Measures - Siemens SINUMERIK 840DE User Manual

2 Connection Conditions
2.1 Secondary electrical conditions
Ï Ï Ï
Ï Ï Ï
Ï Ï Ï
PCU/ Machine
Operator panel
TCU
control panel
front
SL
– Ground (frame) –
S7-300 peripherals
IM 361
/single I/O module
PA
Grounding bar
Central ground connection
conductor/protective
conductor
Fig. 2-2 Grounding concept
References:
2.1.4

RI suppression measures

In addition to the protective grounding of system components, special precau-
tions must be taken to ensure safe, fault-free operation of the system. These
measures include shielded signal cables, special equipotential bonding, isola-
tion, and shielding measures.
Shielded
To ensure safe, interference-free operation of the installation, it is essential to
signal cables use the cables specified in the individual diagrams.
For digital signal transmission, the shield must have a conductive connection at
both sides of the housing.
Exception:
Standard shielded cables grounded on only one side can be used for devices
from other manufacturers (printers, programming devices, etc.).
2-24
NCU
SL
MB
MB
PA
PA
MB: Shielded signal cable with reference ground
M: Motor
G: Encoders
PA: Equipotential bonding conductor
SL: Protective conductor
/EMC/ EMC Configuring Guidelines
SINUMERIK 840D Configuring Manual NCU (PHD) – 03.06 Edition
Distribu–
Power
Gating
tion box
electronics
electronics
SL in the motor cable
MB
Terminal
G
block
G
SL
Machine bed
Cross-sections (mm
w
10
Line supply conn. S SL minimum
S v 16
16 v S v 35
S w 35
© Siemens AG, 2006. All rights reserved
03.06
SL
2
)
S
16
S/2