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

• Low battery voltage indication from charger.

• Any other function that qualifies the operation of the Level Crossing (for example

approach signals HR and ALSR).

• Crossing normal relay.

• Pedestrian gates normal and reverse.

• Reset fault or warning.

• Output state of each flasher.

Other relays/contacts of interest e.g. Signal control relays, releasing switches.

1.9 Digital Outputs

The level crossing monitor has 8 digital outputs. The current state of these outputs is

indicated on the front panel of the level crossing monitor. These outputs are connected to

the 8-way Output Optoisolator which is used to drive the required external relays. This

output optoisolator switches a common positive and are suitable for operating relays. In

particular they are suitable to drive 12 volt BRB 930 series relays directly.

The Level Crossing monitor outputs are as follows:

1 Battery test

Used to control battery test relay.

2 No Fault

This output is ON when no fault condition has been detected with either the level

crossing monitor or the level crossing equipment. The fault indication remains until

reset. This output may be used in the future to control an external flashing beacon

which indicates healthy/faulty level crossing operation to the train driver or public

road users.

3 No Warning

This output is ON when no warning condition has been detected with the level

crossing equipment. The warning indication remains until reset.

4 System

This output operates in conjunction with the No Fault output. This output is ON

when a fault has been detected internally with the level crossing monitor unit. The

output remains on until the fault condition is fixed.

8 Battery

This output operates in conjunction with the No Fault and No Warning outputs. This

output is ON when a fault or warning condition has been detected with the level

crossing battery. The output remains on until the fault or warning condition has

been reset.

9 Lamp

This output operates in conjunction with the No Fault and No Warning outputs. This

output is ON when a fault or warning condition has been detected with the level

crossing lamps. This output remains on until the correct number of working lamps

is detected. It cannot be turned off until the correct number of lamps has been

detected running for at least 10 seconds.

10 Logic