Rack
3.2 Rack UR5213 (6DD1682-0CH2)
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
59
Battery backup
Battery connection
A backup battery must be installed in the power supply circuit to enable the backup of
configured values on power failure (using SAV function blocks).
Technical specifications of the battery
Type 1 x Lithium AA
You may only use batteries that have been approved by Siemens!
Handling lithium batteries
Risk of injury, damage to assets, and emission of pollutants. Improper handling of a Lithium
battery may cause its explosion and incorrect disposal of used lithium batteries may lead to
emission of pollutants. For these reasons, you should strictly observe the following notes:
• Do not throw new or waste batteries into an open fire, or perform any soldering work on
the cell body (max. temperature 100° C), or recharge the battery - risk of explosion! Do
not open the battery and always replace it with one of the same type. Always order
replacements from Siemens. This ensures that you are in possession of a short circuit-
proof type.
• You should return waste batteries to the battery manufacturer, dispose of the batteries
as special waste at a recycling facility.
Sample calculation:
Capacity of the backup battery: 2.3 Ah, 63 % is assumed for calculation
Backup current: 200 µA (monitoring 20 µA + max. 180 µA for the slots, a CPU 551 needs
2.2 µA )
Backup time = 2.3 Ah * 0.63 / 200 µA = 7245 h ≙ 300 days
This time is valid for a rack that is switched off. Only the battery monitoring function draws a
current of 20 µA while the rack is powered on.
It is recommended to replace the batteries at annual intervals. The backup function is
deactivated while the fan tray is removed.
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