Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 17 of 118
This document is uncontrolled when printed.
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
have been detected running for at least 10 seconds.
10.Logic
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 operation of the level
crossing equipment. The output remains on until the fault or
warning condition has been reset. If this output is flashing it
indicates the maintenance disable state.
11.Timer test
Used to control both the non-vital battery test timer and the
battery test relay.
2.7 Analogue inputs
The level crossing monitor has 8 analogue inputs.
Analogue input number 1 is used to monitor the Level Crossing
battery voltage. No connection is required from the level crossing
battery to analogue input 1 as the battery voltage is measured
through the power supply input wires used to power the monitor.
This input is electrically conditioned for a 0 to 20 volts DC input
voltage. The Battery voltage is be considered to have changed when
the voltage is more than 0.95 volt different than the last logged
value.
Analogue inputs 2 to 5 are electrically conditioned for a 0 to 5 volts
DC input voltage. These are normally used to monitor the Level
Crossing lamp currents in the range of 0 to 20 amps DC via the