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

3.4 Incident Investigation

The following actions are to be taken in the event of an incident at a level crossing which

has an operational level crossing monitor:

a) Do not disturb the monitor. Note the state of all indicators on the front panel of

the monitor.

b) Make a physical inspection of the monitor and interface equipment.

c) If the monitor is physically damaged priority is to be given to recovery of the

large DALLAS IC's in positions U6 and U7 on the SCADA 2000 A I/O Board. If

these IC's are recovered intact then the log may be retrieved and analysed by

Signal Engineering. The EPROM in U5 should also be retrieved if possible.

d) If the monitor is undamaged and operating correctly than connect a portable PC

to the monitor and capture a full copy of the event log on the PC.

e) Note the accuracy of the monitors time and date.

f) Reset any alarms or warnings.

g) Examine the log for the time of the incident.

h) Perform any tests required to prove or disprove that the monitor is functioning

correctly. This may be best performed by repeating the commissioning tests.

i) Check that both used and unused inputs and outputs are shown by the monitor

to be in their actual state. Inputs are to be corresponded to the monitor. This is

best done by enabling reporting changes on the appropriate serial channel and

watching the changes occur on the PC screen when the inputs states are

changed. Cause each input to change to both possible states in turn. This must

be done by energising or de-energising the relays etc. For example pull the

negative pin for the XR. Then restore it. Note that additional changes will occur

and the tests need to be structured to correspond each event.

j) 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.

k) Note down the lamp offset voltages currently in use.

l) 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.

m) 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.

n) Under no circumstances is the configuration of the monitor to be changed or

adjustments altered until the investigation is complete.

4 Fault Diagnosis

The following sections list fault conditions and the things to check for to identify their

cause.