Maintenance
7-13
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
7.7 Replacing the Fuse of the Fan Subassembly
Fuse Type
The fuse of the fan subassembly is a standard 5 x 20 mm cartridge fuse to DIN
and not a spare part.
Use the following fuse:
160 mA slow blow if the voltage selector switch is set to 230 V
250 mA slow blow if the voltage selector switch is set to 120 V
Replacing the Fuse
To replace the fuse of the module, follow the steps outlined below:
1. Disconnect the power cable of the fan subassembly from the supply.
2. Use a screwdriver to unscrew the fuse cap.
Fuse cap
Voltage selector switch
3. Remove the blown fuse from the fuse cap.
4. Insert the new fuse in the fuse cap and screw the cap into the fan subassembly.
5. Connect the power cable of the fan subassembly to the supply.
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