Siemens CPU 312C

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
7-5
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You can operate the S7-300 power supply on 120 VAC or on 230 VAC. Factory
setting for PS 307 is always 230 VAC.
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Check to see whether the selector switch is set to the correct mains voltage.
You can change the selector switch setting as follows:
1. Remove the protective cap with a screwdriver.
2. Set the selector switch to the available line voltage.
3. Replace the cover.
CPU
PS
1
2
Figure 7-2 Setting the mains voltage selector switch for the PS 307
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 Remove protective cap with screwdriver.
 Set selector switch to mains voltage