Service Manual

GSM-205-323
Power supply module (PSM)
31st Oct 01
Tech. 4–4
Technical Description: Horizon macro indoor
CONTROLLED INTRODUCTION
68P02902W07-B
PSM alarms
There are three alarms for each PSM, indicated by LEDs (see Table 4-3):
 Output fail.
 Input fail.
 Overtemperature.
PSM LEDs
The LEDs function with the properties shown in Table 4-3.
Table 4-3 Power supply module LEDs function
Green LED
ACTIVE
Red LED
ALARM
Indication
OFF OFF 1. Cabinet power supply off, or
2. Module not connected.
ON OFF Normal operation.
OFF ON 1. Output disable switch off, or
2. Alarm condition with module unable to supply
power.
ON ON Internal problem (such as over temperature), but
still able to maintain supply.
PSM backplane
protection
If a power track on the backplane is broken or short-circuited, the PSM detects
the fault and shuts down to prevent further damage.