Wiring the S7-400
4-27
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
4.15 Setting the VAC Power Supply Module to the Line Voltage
Setting the Voltage Selector Switch
An S7-400 with VAC power supply can be operated from either a 120 V or 230 V
line voltage.
Check whether the voltage selector switch is set to your line voltage. To set the
VAC power supply module to the correct line voltage, follow the steps outlined
below:
1. Open the cover of the power supply module.
2. Remove the window of the voltage selector switch by levering it off with a
screwdriver.
3. Set the voltage selector switch to your available line voltage.
4. Refit the window.
5. Close the cover.
The following figure shows how to set the voltage selector switch to the available
line voltage.
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