Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 79 of 118
This document is uncontrolled when printed.
Check the current sensor output voltages when their is no current flowing
through the measured circuit. The voltages should be in the range of 50 to
110 mV. If they are not then set them correctly as per section 3.3.
Check that both used and unused inputs and outputs are shown by
the monitor to be in their expected 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.
Make sure that the lamps are correctly adjusted and all are
operating correctly. Then place the monitor in lamp learn mode and
operate the crossing by pulling the pin for the XR circuit or XT track
relay. Record the learnt lamp offset values. Lamp learn should not
be done using the TEST Switch as this turns off the battery charger
and is not the normal case. The lamp learn takes approximately 40
seconds to complete. If the lamp learn does not accept all the
offsets then proceed as per Section 5 Fault Diagnosis.
Confirm the battery voltage displayed by the monitor is correct
within a tolerance of +/- 0.30 volts. The level crossing monitor will
display slightly less voltage than the crossing B12 busbar due to
voltage drops on the cable and connectors supplying the 12V for
the monitor. This is corrected using the set battery offset command.
Measure the battery voltage at the battery terminals. Then get the
IO states from the monitor. Record these values and the battery
offset. The battery offset is changed to correct the displayed
voltage.
Set the phone numbers for the level crossing Control Centre. Enter
the dial up phone number with commas to add pauses to allow time
for the dialtone to sound before the number is dialled. The default
dialling is tone dialling. If the phone line being used only works with
pulse dialling then add the letter 'p' to the start of the phone
number.
e.g.tone dialling ,063,337316 pulse dialling p,063,337316
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.
Test and confirm that the expression data is correct for any non-
generic expression by function testing them.