Siemens S7-400 Installation Manual page 96

Wiring the S7-400
Wiring the Power Supply Connector
To wire the power supply connector, follow the steps outlined below:
Warning
!
There is a risk of personal injury.
If you wire the connector with voltage applied, you may suffer a shock and
personal injury.
Only wire the connector with power disconnected.
1. Switch off the line voltage at your VAC supply disconnector.
Note
The standby switch of the power supply module does not disconnect the power
supply module from the supply.
2. Are you using a flexible sheathed cable with outer insulation (with 230 VAC)?
If so: Strip the outer insulation over a length of 70 mm. Note that an overall
cable diameter of between 3 mm and 9 mm must be present under the strain
relief after connection.
If not: Wrap the cores with insulating tape so that an overall cable diameter of
between 3 mm and 9 mm will be present under the strain relief after connection.
As an alternative to insulating tape, you can use a shrink-on sleeve.
3. Shorten the two cores which are not needed for connection to protective ground
(PE) by 10 mm.
4. Strip the cores over a length of 7 mm.
5. Slacken the screw in the cover of the power supply connector and open the
connector.
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S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04