User Manual

Cabinet descriptionNortel Networks Confidential 1–137
S8000/S8002/S8006 BTS Reference Manual
PCU functions
Two types of PCUs are available, depending on the converter type. These two PCU
types have the same functions but are tied to their own rectifiers.
The PCU has the following functions:
It connects the SRU to the batteries (only for the S8000 Outdoor BTS). When the
rectifiers are no longer running, the batteries can supply the PCU outputs
according to the option chosen, the choice being by front panel wiring:
• option 1: two of the four PCU outputs are supplied
• option 2: the four PCU outputs are powered (this is mandatory in the case of
external batteries
It generates four 54 V dc outputs (outputs 1 to 4) for supply of the cabinet boards.
It receives the alarms from the rectifiers.
It receives an analog signal from the temperature probe located on the batteries
(internal or external) and sends a signal to the SRU to adjust rectifier output
voltage inversely to battery temperature (floating voltage).
It generates a disconnection of its four load outputs depending on the signal
received from two ambient temperature probes (one is located at the top of the
cabinet, the other at the bottom).
PCU connections with the SRU
The SRUs, connected in parallel, are connected to the PCU by means of the
following inputs/outputs:
54 V (+) and 54 V(–)
dc fault (alarm)
ac fault (alarm)
overtemperature (alarm)
missing module (alarm)
floating voltage control
remote control
load share
PCU connections with the batteries (only for the S8000 Outdoor BTS)
The batteries are connected to the PCU by means of the following inputs/outputs:
54 V (–) internal batteries
54 V (–) external batteries
54 V (+) internal and external batteries
(+) and (–) of the temperature probe of the internal batteries
(+) and (–) of the temperature probe of the external batteries