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Weehawken Tunnel 900MHz Pager System
User/Maintenance Handbook
Handbook N.-Weehawken_900 Issue No:-A
Date:-05/08/05
Page:-
42 of 50
6.11 12 & 24V Single Relay Board (80-008901 & 80-008902)
6.11.1 Description
The General Purpose Relay Board allows the inversion of signals and the isolation of
circuits. It is equipped with a single dual pole change-over relay RL1, with completely
isolated wiring, accessed via a 15 way in-line connector.
The relay is provided with polarity protection diodes and diodes for suppressing the
transients caused by "flywheel effect" which can destroy switching transistors or induce
spikes on neighbouring circuits. It’s common use is to amalgamate all the alarm signals into
one, volts-free relay contact pair for the main alarm system.
Note that the board is available for different voltages (12 or 24V) depending on the type of
relay fitted at RL1.
6.12 JWS150-12/A PSU (96-300052)
6.12.1 Description
The power supply unit is a switched-mode type capable of supplying 15V DC at 12Amps
continuously. The equipment in this system requires 12V DC so the output voltage has been
factory adjusted to 12.3V. Equipment of this type typically requires approximately 4-6Amps
at 12V DC, so the PSU will be used conservatively ensuring a long operational lifetime.
No routine maintenance of the PSU is required. If a fault is suspected, then the output
voltage from the power supply may be measured on its output terminals. This is typically set
to 12.3V. The output voltage may be varied using a multi-turn adjustment potentiometer
mounted close to the DC output terminals.
All the PSU’s used in AFL Cell Enhancers are capable of operation from either 110 or 220V
nominal AC supplies. The line voltage is sensed automatically, so no adjustment or link
setting is needed by the operator.
6.12.2 Technical Specification
AC Input Supply:
110 or 220V nominal
Voltage:
90 to 132 or 180 to 264V
(absolute limits)
Frequency: 47 to 63Hz
DC Output Supply:
15V DC (nominal)
Voltage:
12.3-17V (absolute limits)
Current: 12A