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S5-115U Manual
B
Maintenance
Proper functioning of the programmable controller can only be guaranteed if the electronic
components have not been interfered with.
This appendix describes the maintenance jobs you can perform on your programmable controller.
These are
•
Changing the fuses
•
Installing and changing the batteries
•
Changing the fan filter
•
Replacing the fan motor
B.1
Changing Fuses
For the output modules with red LED indicators for fuse failure, you can remove the fuses with a
screwdriver (maximum width 3 mm). Swing the front connectors out to access the fuses. Fuse spe-
cifications are noted on the inside of the front doors.
B.2
Installing or Changing Battery
The power supply modules 6ES5 951-7LB21/7NB21 are provided with a backup battery. Use a
3.4 V / 5 Ah lithium battery (Order No. 6EW1 000-7AA; size C) for backup in those power supply
modules. Its service life for continuous backup is at least two years (one year when using CPs).
The power supply modules 6ES5 951-7LD21/7ND41/7ND51 are provided with two backup
batteries. Use a 3.6 V / 1.75 Ah lithium battery each (Order No. 6ES5 980-0AE11; size AA) for
backup in those power supply modules. Its service life for continuous backup is at least one year.
Changing Battery in Power Supply Modules with 2 Backup Batteries
•
Since the second battery takes over the backup function you can change the discharged
battery without any problems.
•
After changing of the battery, the backup function remains with the second battery. Only
when this battery is discharged, the new battery takes over the backup functions.
Note
If you install or change a battery when the PLC is shut off and there is no external
voltage supply, perform an Overall Reset on the CPU afterwards. Otherwise, the CPU
cannot go into the RUN mode.
EWA 4NEB 811 6130-02b
Maintenance
B-1
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