Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 19 of 118
This document is uncontrolled when printed.
The details of the test are as follows.
 Perform a through check of the operation of the Level Crossing
monitor which includes processor test, event log integrity check,
EPROM checksum, RAM test. If all checks do not pass then the
battery test does not commence and a system fault is indicated
and reported.
 Check battery voltage to determine if it is within limits. If it is too
low, then abort the battery test, indicate a battery Fault and report
it.
 Check that the battery test current is less than 1.0 ampere and
the Battery test cut-off indication is ON. (this is to check the
operation of the current sensor and the battery test cut-off relay.
 Report that the test has commenced and break the
communications link by hanging up the modem.
 Turn on output 8 (that is Timer test). Check that the Battery test
cut-off indication turns OFF between 4 minutes 30 seconds and 5
minutes 30 seconds later. If it does not, then abort the battery
test, indicate a Fault and report it. (This tests that the timer relay
is working correctly and that it is set for the correct time.)
 Turn OFF timer test output.
 Check that the battery test current is less than 0.5 amps and the
Battery test cut-off indication is ON.
 Turn ON both timer test output and Battery test output at the
same time.
 Monitor that the Battery test current is greater than 6 amps and
battery voltage remains greater than alarm voltage for 3 minutes. If
battery voltage drops below the alarm voltage, stop test and
indicate a battery fault; otherwise terminate the test at the end of
4 minutes and indicate and report the current state of the level
crossing.
Note: The battery test is stopped automatically if the crossing starts
operating (train is approaching). The battery test is automatically
recommenced 30 seconds after the crossing stops operating.
2.9 Configuration
There are two types of configurable items. One set may be changed
during normal operation. The other set can not. Both are stored in
non-volatile memory.
Configurable items that can not be changed during normal operation
are: