Reference Manual

Climate Protection
51.2.5 Climate Supervision
The internal temperature and humidity of the air in the RBS are
measured by sensors and kept within working ranges.
The following parameters are measured:
•
The internal temperature outside the normal range
•
The internal temperature outside the safe function range
•
The internal relative humidity raised above the upper limit for
safe function, see note below.
Administration
•
The internal temperature in the RBS cabinet is readable.
• The internal realative humidity in the RBS is readable. See note
below
Note: The humidity function is not needed for RBSs designed for
indoor use according to ETSI 3.1.
51.2.6 Reliability
The cooling Climate Protection is available when the temperature is
within the specified external normal condition range. Alarm reporting
and administration are available within the safe function range.
The Heating function is available when the temperature is above the
specified external normal condition low limit and up to an internal
temperature of +5

C. Alarm reporting and administration are available
within the safe function range.
51.2.7 Power Connection
At start and restart of the RBS, the connection of the RBS power
system to the incoming AC mains and the connection of the users to the
DC power in the RBS depends on the current internal temperature.
When starting or restarting the RBS, actions are first taken to free the
internal surfaces from condensation.
There are a number of startup scenarios, based on the internal
temperature at the moment of startup:
• The internal temperature within the safe function range
− The RBS power system and the user are connected
• The internal temperature is below the lower limit for safe function
low limit
− The internal temperature is increased by heating to above
the lower limit for safe function. Then the power system
and the users are connected
• The internal temperature is above the upper limit for safe function.
EN/LZT 720 0008 P2A
2001-11-28
401 (485)
© Ericsson Radio Systems AB
— All Rights Reserved —
Preliminary