Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 66 of 118
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10.Confirm the battery voltage displayed by the monitor is correct
within a tolerance of +/- 0.30 volts. Measure the battery voltage at
the battery terminals. Then get the IO states from the monitor to find
the monitors measured battery voltage. Record these values and the
battery offset.
11.Note down the lamp offset voltages currently in use.
12.Correspond the lamps This is best done by enabling reporting
changes on the appropriate serial channel and watching the
changes occur on the PC screen when the a lamp is removed or
restored. Operate the crossing then correspond one lamp from each
lamp stand.
13.Select lamp diagnostics mode. While the crossing is not operating,
check that no lamp diagnostic information is displayed for any lamp
channel. While the crossing is operating check that the correct
number of lamps is reported at least 95% of the time. If not examine
lamp adjustment, lamp types.
14.Under no circumstances is the configuration of the monitor to be
changed or adjustments altered until the investigation is complete.
5. Fault Diagnosis
The following sections list fault conditions and the things to check for to
identify their cause.
5.1 General
Their are two processes for fault finding on the Level Crossing Monitors
they are; with a PC, and without a PC.
Fault finding with a PC normally consists of issuing a set of
interrogation commands to examine the monitors current status to find
the problem or obtaining a copy of the event log when the problem
occurred and examining the log to determine the probable cause of the
problem. Fault finding using a PC can be conducted locally or remotely.
Fault finding without a PC can only be used to find a fault condition
that is still current. It consists of :
 Examining the front panel indications to check that they are as per
Section 3.
 Note any Fault, or Warning condition.
 Examine the state of the inputs indicated on the Input Optoisolator
and Battery voltage to determine if they are the cause of the Fault, or
Warning condition.