Service Manual

GSM-204-323
AC power distribution
31st Oct 01
Tech. 4–6
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
AC distribution
description
There are two ac distribution boxes and an ac power outlet socket associated
with the Horizon
macro outdoor PSU.
Number 1 ac distribution box
The number 1 ac distribution box (see Figure 4-5) is located in the top panel of
the cabinet. It contains circuit protective devices and a terminal block, and
provides:
 The termination point for the incoming mains supply.
 A four pole 32 A main circuit breaker (also used as a switched disconnect
for external ac power supplies).
 A double pole 6 amp (30 mA) residual current breaker with overcurrent
protection (RCBO) to supply the ac power outlet socket.
 The means of configuring the BTS to accept the following incoming mains
supply voltages:
– 230 V ac 50 Hz single phase and neutral.
– 230 V ac 50 Hz three phase and neutral (star configuration).
– 230 V ac 50 Hz three phase (delta configuration).
– 110 V ac 60 Hz single phase and neutral.
NOTE
When the Horizon macro is supplied by 110 V single
phase, the 4 pole main circuit breaker is configured as two
parallel pairs – one pair breaking the live phase and one
pair breaking the neutral. This provides circuit protection at
a total of 64 amps.
MAINS DISCONNECT
4 POLE 32 A TYPE C
AC SOCKET
6 A 30mA
1 3 5 7 9 11
2 4 6 8 10 12
Figure 4-5 The number 1 ac distribution box