Wiring The Power Supply Module And The Cpu - Siemens SIMATIC S7-300 Hardware And Installation Manual

Wiring
7.4

Wiring the power supply module and the CPU

Requirement
The modules are mounted on the rail.
Connection comb (not CPU 312 IFM and CPUs with MMC)
You can connect some of the CPUs to the PS 307 power supply module using the
connection comb included with the module.
PS and CPU wiring
Note
The PS 307 power supply module is equipped with two additional DC 24 V
connections (L+ and M) for the supply of I/O modules.
Note
On the 31xC, 312, 314 (6ES7314-1AF10-0AB0) and 315-2 DP (6ES7315-2AG10-
0AB0) CPUs, the power supply connector is a plug and can be removed.
Warning
You can come into contact with live wires if the power supply module and any
additional load power supply units are connected to the mains. You should
therefore disconnect the S7-300 from the power supply before starting the wiring.
Only use ferrules with insulating collars to press-fit onto the ends of the cables.
Once you have wired the modules, close all the front panels. You can then switch
on the S7-300 again.
1. Open the front panel to the PS 307 power supply module and CPU.
2. Open the strain relief clamp 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 clamp again.
5. You have two options for wiring the CPU, depending on which one you
are using:
For theCPUs 31xC, 312, 312 IFM (on which the power connection is on the
–
front connector of the integral peripheral), 314 (6ES7314-1AF10-0AB0), and
CPU 315-2 DP (6ES7315-2AG10-0AB0), the power supply connector is a
plug and may be 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.
CPU 313/314/314 IFM/315/315-2 DP/316-2 DP/318-2 DP: Insert the
–
connection comb and screw-tighten it.
6. Close the front panel.
7-6
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02