Siemens SIMATIC S7-400 Hardware And Installation Manual page 92

Wiring the S7-400
6. Slacken the screw of the strain relief and insert the cable.
7. Connect the cores according to the illustration on the cover of the power supply
connector. Connect the longer core to PE. Screw on the cores with a torque of
0.6 to 0.8 Nm.
Cable
8. Tighten the screw of the strain relief, so that the cable is secured properly.
9. Close the power supply connector and screw on the cover.
Caution
!
The power supply module or power supply connector can be damaged.
If you plug in or disconnect the connector with voltage applied, the power supply
module or the connector may be damaged.
Only plug in or disconnect the power supply connector with power removed.
4-30
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AC DC
L1 L+
N L-
PE PE
Strain relief
S7-400 and M7-400 Programmable Controllers, Installation Manual
Terminals
Strain relief
screw
C79000-G7076-C424-01