Wiring the S7-400
4-37
AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
4.21 Setting the Fan Subassembly to the Line Voltage andWiring It

Setting the Fan Subassembly to the Line Voltage

Check whether the voltage selector switch in the fan subassembly is set to your
line voltage (see Figure 4-24).

Fuse

The fan subassembly has two standard fuses:
•A 250 mA slow blow fuse for the 120 V range
•A 160 mA slow blow fuse for the 230 V range.
The fuse for the 230 V range is fitted before delivery.
Note
If you change the voltage range, you must also fit the fuse for this voltage range in
the fan subassembly.Replacing the fuse is described in Chapter 7.

Wiring the Fan Subassembly

1. Stripthe cables of the power cable. Press-fit wire end ferrules onto the
conductors.
2. Insertthe wires in the power terminals of the fan subassembly. Use a suitable
screwdriver to release the spring contacts of the power terminals.
3. Thesmall cover serves as a strain relief for the power cable. Choose one of the
three sizes provided to suit your cable cross-section.
4. Screwthe strain relief on.
Power terminals
(spring contacts)
Voltageselector switch
Fuse cap
Fit the small cover
as a strain relief
Figure 4-24 Wiring the Fan Subassembly