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

Additional buried cables to adjacent signalling locations are not normally cost justifiable to

provide the normal or additional inputs into the Level Crossing Monitor.

It is not desirable to use of the Level Crossing B12 or B15 supply for inputs outside the

Level Crossing Hut. This may however be accepted on a case by case basis.

Standard circuit sheet X015 details the types of inputs to be provided to the Level

Crossing Monitor and their preferred input numbers. It includes all the inputs for a double

line crossing with signals.

Inputs 1 to 8 should always be used for their nominated purpose and if the input is not

available then it should be left spare.

Inputs 9 to 12 should be used for any readily available Signals, Ground Frames, or Points

etc so that their operation may be logged.

Inputs 13 to 23 should always be used for their nominated purpose and if the input is not

available then it should be left spare.

Inputs 24 to 31 may be used for any purpose. The inputs detailed are a suggestion only.

It is normal for Country Level Crossings to have the DSPR on input 28, DSJR on input

29, DSJPR on input 30.

When applying Standard circuit sheet X15 to a particular Level Crossing the designer

must check:

When applying Standard circuit sheet X026 to a particular Level Crossing the designer

must check is their is a NO Charge relay provided with the Store 74. If there is not then

one needs to be provided.

5.1.2 Battery Test Outputs

Circuit sheet X14 shows the connections for the LX Monitor. The 8-way Output

Optoisolator terminals 1 & 8 are used to control the remote battery test. The outputs

switch to B12 to start a remote battery test. Both outputs are used instead of only one to

minimise the risk of a false remote battery test failing the battery.

5.1.3 Battery Test Relay

The Battery Test Relay is a Q type, 12 volt QBCA1. The heavy duty contacts of this relay

are designed to carry a DC current of at least 30A for a minimum of 10 seconds on a 50%

duty cycle. It is capable of breaking a current of 30A without damaging the relay. The

normal duty contacts of this relay are rated 18V- 250V Switching AC Inductive and 3

Amps continuous.

The heavy duty contacts place a load resistor across the level crossing battery, see sheet

X25. Two back contacts of this relay disconnect the STORE 74 Battery Charger for the

duration of the test. The Battery Charger will draw a maximum of 3 Amps which is well

below the current capacity of these two parallel back contacts. A front contact of this relay

is also fed into the LX monitor for detection purposes.

5.1.4 Non-Vital Timer

The Non-Vital timer circuit is shown on sheet X25 of the Standard Circuits. The CUT OFF

Timer is a delay ON timer set for 300 seconds. The unit is an industrial quality timer

designed for critical timing applications. It is used to stop the Battery test if the test

continues for significantly longer than the Battery test should last for. The CUT OFF

Timer de-energises the TEST CUT OFF Relay to stop the test.