User's Manual Part 1

Table Of Contents
Functiona
l
Description 3EM21522AAAA
DTR-0200-SA-SIRIUS Issue 1, March 2008
2-16
A manual ON/OFF control switch is located on the front panel of the UPS and
allows the unit to be manually switched on or off. This is used primarily by mainte-
nance technicians when servicing the repeater.
An internal automatic ON/OFF switch switches the unit off when the +5 or 3.3
input voltages drop.
This prevents back current feed to the power supply. The UPS
has a 3-wire interface for connection of an optocoupled AC sensor.
Figure 2 - 9 Uninterruptible Power Supply (UPS)
2.3.1.4.7
SPU Power Supply
The power supply is 208VAC, 30-50 W brick power supply AC/DC converter and pro-
vides all required voltages for the SPU:
+5V @ 3A
+3.3V@1A
+12V@2A
-12V@0.5A
+24V@1A
The power supply input is 208VAC/50-60 Hz.
2.3.1.4.8
SPU Compartment Heater
The SPU compartment heater protects the SPU enclosure from freezing and/or con-
densation.