Specifications

RailCorp Engineering Manual — Signals — Equipment Manual

Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261

Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1

1 Introduction

1.1 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

8,000 changes to; relay positions, analogue voltage changes and to changes in the

number of operating lamps. Typically this is equivalent to 120 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 an automatic monitoring and checking system for a number

of level crossing monitors.

1.2 Referenced and associated publications

The following Signal Engineering Specifications provide additional information to this

document and are available on the RailCorp Engineering Internet and Intranet.

Specification SPG 1033 Vital Indication Optoisolator.

Specification SPG 1260 Level Crossing Monitor Requirements

Specification SDG 001 Circuit Design Standards (standard signalling circuits)

The following superseded Signal Engineering Specifications provide additional

information to this document and are only available by request to RailCorp.

Specification 1068 Analogue to Digital Converter

Specification 1071 Level crossing monitor hardware

Specification 1072 Level Crossing monitor - backplane.

Specification 1073 Scada 2000 D12 - Individual Input Optoisolator

Specification 1074 8 way output optoisolator