Siemens SIMATIC Manual page 22

4
Step 2: Wiring
Warning
!
You can come into contact with live wires if the PS 307 is switched on or the PS
network cable is connected to the power.
Only wire the S7-300 in a deenergized state!
Stage
1 Open the front doors of the power module and the CPU.
2 Loosen the clamp for the power module strain relief (see the figure on page 3).
3 Strip the power cable, attach wire-end ferrules, if necessary (for multi-wire cables), and attach
to the PS.
4 Tighten the clamp for the strain relief.
5 Insert two short connection cables between the power module and the CPU (see picture on
page 3) and tighten it.
6 Check that the line voltage selector switch is set to your line voltage.
The power module is set in the factory to a line voltage of AC 230 V. To change the voltage,
proceed as follows: Remove the protective cap with a screwdriver, set the switch to the line
voltage required and replace the protective cap.
4
Figure
2
1
3
0.8 – 1.1 Nm
Wiring the Power Supply and the CPU
Automation System S7-300, Getting Started – CPU31xC:Commissioning:
Mounting the Module on the Rack
1. Attach the PS, push it up to the
grounding screw of the rail and
tighten it.
2. Attach the CPU (1), push it up to
the module on the left (2) and tip it
downward (3).
3. Screw the CPU on tightly.
4. Insert the Micro Memory Card in
the CPU (4). This is absolutely ne-
cessary for operation
A Micro Memory Card with un-
known content should be first dele-
ted in the programming device.
A5E00105538-02