User's Manual

Weehawken Tunnel Remote Repeater
User/Maintenance Handbook
Handbook Nō.-Weehawken_River_P Issue No:-A
Date:-05/08/05
Page:-
19 of 36
4. ALARMS
4.1 Alarm/Monitor System
4.1.1 Alarm/Monitor Description
The alarm system acts as an alarm concentrator for all the alarms in the unit. Firstly, within
each active component, the individually alarmed modules are ‘summed together’ and
presented to the outside world as a volt-free, relay contact pair (pins 1 & 2 in the IP65 alarm
connector.
As all the alarms in the system are ‘held closed loops’, should the power supply fail, the
main system alarm will be triggered.
4.1.2 Alarm/Monitor Technical Specification
PARAMETER SPECIFICATION
Operating voltage: 12V (floating earth)
Alarm output relay contacts:
Max. switch current: 1.0Amp
Max. switch volts: 120Vdc/60VA
Max. switch power: 24W/60VA
Min. switch load: 10.0µA/10.0mV
Relay isolation: 1.5kV
Mechanical life:
>2x10
7
operations
Relay approval: BT type 56
Connector details: 25 Way ‘D’ Connector
operational: :-10°C to +55°C
Temperature range
storage: :-40°C to +70°C