Rack
3.1 Rack UR6021 (6DD1682-0CH3)
SIMATIC TDC hardware
46 System Manual, 08/2017, A5E01114865-AL
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, CPU555/CPU551
needs 3 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 when the fan tray is removed.
Battery voltage monitoring
The CPU module inserted in slot 1 detects missing or low backup batteries and signals these
states with a flashing "b".
Unscsrew and remove the lid of the battery compartment to remove the battery.
Observe correct polarity when inserting the battery. You should also take care not to bend
the connection tabs of the battery holder during replacement.
To prevent data loss, you should always replace the battery while the rack is powered on.
Ventilation/cooling (Page 48)
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