Service Manual

GSM-204-323
Control and alarm board (CAB)
31st Oct 01
Tech. 4–14
Technical Description: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W02-A
Control and alarm board (CAB)
Introduction to
the CAB
The CAB is located in the outdoor PSU between the dc circuit breaker panel
and the number 2 ac distribution box. It provides the following functions:
 Control of TOPSM output voltage (voltage trim).
 TOPSM disable relay control.
 Control of battery and communications contactors:
– During cabinet power up.
– During low voltage disconnect (LVD).
 Monitoring of battery voltage and temperature.
 Monitoring of TOPSM input and output failure signals.
 Monitoring of non EMC enclosure temperature.
 Monitoring of alarms from the cabinet, the TMS, and the auxiliary
equipment housing.
 Performing a battery charge capacity test on the internal batteries.
The CAB sources dc power from all of the following:
 The distributed dc regulated output of the TOPSMs.
 The TOPSM auxiliary output.
 The communications equipment side of the outdoor PSU communications
contactor.