Product Data RBS 2206
6.6.2
Weights
Table 67
BBS 2000 unit weight
Unit
Weight in kg
Weight in lb.
Battery stand, without
batteries
170
375
Battery stand, with 2 batteries
490
1080
Battery stand, with 3 batteries
650
1433
6.6.3
Output Voltage
The voltage range to the RBS cabinet is +20.2 - 29.0 V DC.
Predefined voltage
+27.2 V DC
Battery low voltage limit
+21.0 V DC
6.6.4
BBS Cabinet Hardware
Battery Fuse Unit
The battery fuse unit (BFU) monitors and controls the batteries. It will
cut off the load (the RBS) when any of the following conditions occur:
•
A mains failure lasts longer than the back-up time. When the
battery voltage drops below a preset value, the BFU disconnects
the RBS. This is to prevent damaging the batteries by over-
discharging. The BFU continues to feed the transmission
equipment and/or the DC/DC converter until the voltage has
dropped to 20.0 V DC.
•
The temperature of the batteries is too high.
•
A short circuit occurs between the distribution cables. This will
release the circuit breaker in the BFU.
The BFU also supplies voltage through two fuses directly to
transmission equipment and/or through the DC/DC converter (optional)
to transmission equipment. BFU-21 supplies through two fuses (12 A),
BFU-22 supplies through one fuse (40 A).
One BFU is needed for each RBS cabinet.
BFU-21 and BFU-22 differ in their power outputs, see Table 66 on
page 126.
DC/DC converter (optional)
The DC/DC converter is located in the BBS and co24 V DC
to -48 V DC.
Battery Blocks
The batteries are for stationary use. They are a sealed lead-acid type,
with valve ventilators. The battery is composed of battery blocks in one
128 (485)
EN/LZT 720 0008
P2A
2001-11-28
© Ericsson Radio Systems AB
— All Rights Reserved —
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Summary of Contents for RBS 2106
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