Siemens SIMOTION D425-2 Manual page 98

Supplementary system components
7.2 Fan/battery module
a malfunction is detected (fan does not turn or fan turns at too low a speed).
Cooling clearance
NOTICE
Higher operating temperature if ventilation clearances are too small
The ventilation clearances of 80 mm above and below the components must be observed.
The unit protects itself from overheating by shutting down.
The ventilation clearance is measured from the lower edge of the module, i.e. the fan/battery
module is not included in the dimension.
Buffering data
For the retentive storage of process variables, the SIMOTION D4x5‑2 has an NVRAM memory
that permanently backs up the data against a power failure.
The real-time clock is backed up by a SuperCap and continues to run when there is a power
failure. This backup is for at least 4 days.
If this backup time is not sufficient, the real-time clock can be backed up by a battery that is
inserted in the fan/battery module. The battery is already included in the scope of delivery of
fan/battery modules.
Note
The backup time when a battery is used is at least 3 years. For the replacement part case,
you should back up the NVRAM data additionally on the CF card via the application
("_savePersistentMemoryData").
Battery
A 3 V lithium battery can be inserted in the fan/battery module. The battery is pre-assembled
with an approximately 4 cm long cable with plug connector. The matching mating connector
is attached to a small printed circuit board for connection in the fan/battery module.
See also
Available spare parts and accessories (Page 135)
Replace battery in the fan/battery module (Page 99)
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SIMOTION D4x5-2
Manual, 04/2014