Adjusting The Power Supply Module To Local Mains Voltage - Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual

Wiring

6.3 Adjusting the power supply module to local mains voltage

6.3 Adjusting the power supply module to local mains voltage
Introduction
You can operate the S7-300 power supply module on 120 VAC or 230 VAC. The default
setting for the PS 307 is 230 VAC.
Mains voltage selector switch adjusting
Verify that the setting of the voltage selector switch matches your local mains voltage.
To set the selector switch:
1. Remove the protective cap with a screwdriver.
2. Set the selector switch to match the local line voltage.
3. Reinsert the protective cap.
Key to numbers in the figure
(1)
(2)
6-4
2 2
Remove the protective cap with a screwdriver
Set selector switch to mains voltage
1 2
P S
C P U
Operating Instructions, Edition 08/2004, A5E00105492-05
S7-300, CPU 31xC and CPU 31x: Installation