Operating The S7-400 From A Grounded Supply - Siemens SIMATIC S7-400 Installation Manual

Wiring the S7-400
S7-400 in the Overall Installation
Shown in Figure 4-1 is the position of the S7-400 in the overall installation (load
current power supply and grounding concept) with supply from a TN-S system.
Note: The arrangement of supply terminals shown is not the actual arrangement; it
has been chosen for reasons of clarity.
L1
L2
L3
N
PE
¡
L1
N
P
E
¢
AC
AC
AC
DC
Figure 4-1

Operating the S7-400 from a Grounded Supply

4-6
Low-voltage distribution e.g. TN-S system (3 x 400 V)
Cabinet
Racks
PS CPU
Ground bus in cabinet
©
Load circuit
£
24 to 230 VAC for AC modules
©
£
Load circuit 5 to 60 VDC
for isolated DC modules
Automation System S7-400 Hardware and Installation
SM
L +
Data
M
Signal modules
A5E00850741-01