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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
7-7
1. Open the front panel to the PS 307 power supply module and CPU.
2. Open the strain relief on the PS 307.
3. Strip the power cable to a length of 11 mm and connect it to L1, N and to the
ground conductor terminal of the PS 307.
4. Screw-tighten the strain relief again.
5. Now, wire the power supply and CPU.
The power supply connection of the CPUs can be inserted and removed.
Strip the connecting cables for the CPU power supply to a length of 11 mm.
Connect the lower terminals M and L+ on the PS 307 to terminals M and L+ on
the CPU.
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Reversing the polarity of the M and L+ terminals trips the internal fuse on your
CPU. Always connect the M terminal of the power supply and CPU and the L+
terminal of the power supply and CPU to one another.
6. Close the front panel.
The figure below illustrates the procedures described above.
230V
DC 24 V
L1
N
L+
M
M
L+
I
M
L+
230 V/120 V
1
2
3
Figure 7-3 Wiring the power supply module and the CPU
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Strain relief of the power supply
Connection cables between the power supply and CPU
Removable power supply connection
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