User's Manual

Weehawken Tunnel 900MHz Pager System
User/Maintenance Handbook
Handbook N.-Weehawken_900 Issue No:-A
Date:-05/08/05
Page:-
22 of 50
5. POWER SUPPLIES & ALARMS
5.1 800MHz Power Supply (80-231302)
5.1.1 800MHz Power Supply Description
The power supply for the 800MHz cell enhancer uses 15V PSU modules ‘turned down’ to
12V (all the amplifiers in the 800MHz CE use 12V DC supply). It is a standard power
supply shelf using two PSU modules with their outputs combined through power diodes and
terminating in six, dedicated 12V outputs. Failure of either PSU module will trigger a non-
latching summary alarm, (short-term mains failures will allow the system to return to a ‘non-
alarmed’ state). The alarm interface is on the alarm ‘D’ connector pins 1 & 2.
5.1.2 800MHz Power Supply Technical Specification
PARAMETER SPECIFICATION
Input: 110V AC @50/60Hz (single port)
Outputs: 6 x 12V DC @ 20A each
Front panel indicators: (x 2) Green LED for ‘PSU1/PSU2 ON’’
Fuses 1 x 20A each outlet socket
DC Socket XLR
operational:
-10°C to +55°C
Temperature range
storage: -40ºC to +70ºC
Alarmed devices: Either PSU failure
Alarm interface (volt-free contacts): ‘D’ type alarm connector, pins 1 & 2
MTBF: >50,000 hours
Earthing: M8 stud
5.1.3 800MHz Power Supply System Diagram
The system diagram is not available at the time of writing this document.