Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 3 of 118
This document is uncontrolled when printed.
About This Publication
This document provides information for the maintenance of SCADA-2000
Cerberus Level Crossing monitors.
This document is primarily intended to be read by staff involved with the
testing, commissioning and maintenance of the Level Crossing monitor
equipment.
The ‘Cerberus’ level crossing monitor, monitors the status of a railway level
crossing warning system, logs events, reports warning or failure conditions
to a central location (Control Centre), and provides facilities to remotely
test the level crossing battery supply. In typical installations the following
items are monitored and logged (some also have alarms): track circuits,
control relays, level crossing warning lamps, flasher units, power supplies,
batteries, associated signal control relays. The event logging retains the
last 10,000 changes to; relay positions, analogue voltage changes and to
changes in the number of operating lamps. Typically this is equivalent to
150 crossing operations.
The level crossing monitor is designed and interfaced to the level crossing
equipment in such a way as to minimise the risk of it providing incorrect
information in a manner that is not obviously incorrect or reducing the
integrity of the level crossing.
The level crossing monitor has been especially designed to be interfaced
with Signal Engineering standard signalling designs which are used
throughout NSW. (See standard signalling circuits in appendix C).
Maintenance staff can visit the level crossing monitor and download the
logged information and the unit’s status via a PC and serial cable or they
can obtain the same information remotely via modem from a remote site.
If the optional Control Centre system is implemented then the Control
Centre automatically interrogates the level crossing monitor sites and
conducts battery tests. This Control Centre provides a automatic
monitoring and checking system for a number of level crossing monitors.