Service Manual

GSM-204-323
The outdoor power supply module (TOPSM)
31st Oct 01
Technical Description: Horizon macro outdoor
68P02902W02-A
CONTROLLED INTRODUCTION
Tech. 4–27
LED display
There are four LEDs mounted on the front of the TOPSM, which indicate the
following:
 I/P HEALTHY (yellow) - lit when the input voltage is present and within
specified limits (88 to 264 V ac).
 OVERVOLTAGE (red) - lit when the TOPSM has shut down due to an
output voltage in excess of –59.9 V dc.
 OVERCURRENT (red) - lit when the TOPSM is in current limit and
delivering a current in the range 22 A to 24 A. The LED is normally unlit,
but when lit does not necessarily indicate the existence of a fault as this
may be due to recharging of the batteries after an ac supply interruption.
 O/P HEALTHY (green) - lit when output voltage is present and within
specified limits (–39 to –59.9 V dc).
Functional
diagram
Figure 4-18 shows a functional representation of the outdoor power supply
module (TOPSM).
I/P HEALTHY
OUTPUT FAIL
INPUT FAIL
BACKPLANE CONNECTOR
RED
LED
YELLOW
LED
VIN (88 V to 264 V)
POWER
CONVERTER
AND
SYSTEM
MONITOR
VOLTAGE TRIM
VOUT (–55 V)
ENABLE IN
O/P HEALTHY
OVERVOLTAGE
I/LIMIT
RED
LED
GREEN
LED
CONTROL
AND
ALARM
CURRENT SHARE
OTHER
TOPSMs
AUXILIARY SUPPLY (12V)
CONTROL
AND
ALARM
ENABLE OUT
RELAY 1 ON
RECTIFIER
PCB
Figure 4-18 Functional diagram of TOPSM