Specifications

RailCorp Engineering Manual — Signals — Equipment Manual
Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261
© RailCorp Page 15 of 89
Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1
1.11 Battery Testing
The level crossing monitor has a facility for testing the capacity and terminal voltage of
the level crossing battery and reporting the results to a remote location or Control Centre
via a dial-up modem.
The level crossing monitor uses outputs 1 and 8 (that is Battery Test, and Timer Test) to
control the battery test circuitry. These outputs control the 120 V AC supply to the level
crossing battery charger, and a test load for the level crossing battery.
The process of testing the level crossing battery after a request is received from a Control
Centre or maintainer takes approximately 8 minutes to complete
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.
1.12 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:
• Name and date of the permanent configuration data.
• For each digital input, its name.
• For each digital output, and intermediate state, their name and controlling Boolean
expression.
• For each Timer its name, controlling Boolean expression, and duration in hours,
minutes, and seconds.
• For the battery analogue input, its name, fail voltage, and bus voltage correction.