Service Manual

GSM-204-323
AC power distribution
31st Oct 01
Technical Description: Horizon macro outdoor
68P02902W02-A
CONTROLLED INTRODUCTION
Tech. 4–7
Number 2 ac distribution box
The number 2 ac distribution box (see Figure 4-6) is located in the upper right of
the PSU and contains circuit protective devices as follows:
 Three 20 amp double pole circuit breakers to supply the outdoor power
supply modules (TOPSMs).
 One 10 amp double pole circuit breaker to supply the thermal
management system (TMS) heaters.
Each double pole circuit breaker also acts as a switched disconnect for its
respective circuit, breaking both feed and return lines. The output of each circuit
breaker is fed to its load by discrete cables.
TMS
10 A TYPE B
PSU 1
20 A TYPE B
PSU 0
20 A TYPE B
PSU 2
20 A TYPE B
Figure 4-6 The number 2 ac distribution box
AC outlet
socket
The socket (see Figure 4-7) is a European domestic type and is housed in a
weatherproof enclosure which has an IP56 protection rating. It is nominally rated
at 230 V, 5 A max and is supplied from a 30 mA RCBO in the number 1 ac
distribution box.
The purpose of the socket is to allow site engineers to use standard 230 V
portable test and diagnostic equipment when installing, commissioning or
servicing the Horizon
macro outdoor BTS.