Specifications

RailCorp Engineering Manual — Signals — Equipment Manual
Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261
© RailCorp Page 9 of 89
Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1
level crossing monitor. The Fault indication is latched until the fault reset push button is
pressed or the fault reset command with the appropriate pin number is received from a
serial channel.
The NO WARNING status indicates that none of the warning conditions are present. The
Warning indication is latched until the fault reset push button is pressed or the fault reset
command with the appropriate pin number is received from a serial channel.
The list below indicates what could cause the status indications. This list is based on the
standard set of GENERIC i/o and expression files dated 18/5/95.
A status indication of WARNING is indicated if one or more of the following has occurred:
• No remote or local test of the level crossing has occurred within the last 36 hours.
• The local test was not valid as it was not conducted for the 2 minute minimum
period.
• No train has traversed the level crossing within the last 72 hours.
• The Emergency switches have been turned off for more than 10 minutes.
• There has been a failure of some nominated item of signalling equipment near the
level crossing. e.g. points detection failure, signal lamps out or track failure.
A status indication of WARNING & LAMP is indicated if:
• One of the lamps is not working.
A status indication of WARNING & BATTERY is indicated if:
• The AC Supply has been OFF for more than 6 hours 30 minutes.
A status indication of WARNING & SYS_FAULT is indicated if:
• The Level Crossing Monitor itself has an internal fault. A possible internal fault
could be due to failure of the A/D card, real time clock, CPU, memory, log data
analogue input, or EPROM, a test output being ON without a test being requested.
A status indication of FAULT & LOGIC is indicated if the level crossing has:
• not started operating 6 seconds after the time that it should start operating.
• not stopped operating 6 seconds after it should have stopped operating.
• not had a change of state on the flasher inputs within the last 5 seconds when the
level crossing should be operating.
• operated continuously for more than 20 minutes.
• remote battery testing output on without a test being requested or the test runs for
more than 5 minutes and 30 seconds.
• the Boom normal when it should not be, or not normal when it should be normal.
• A pedestrian gate closed when it should not be, or open when it should not be.
• either direction stick relay is energised when no train is present.
• Battery Test relay is faulty or not present (possibly causing the battery charger to
be without power).
• When traffic light interfacing is also provided:
i) Traffic Light Response (TLR) is received for each crossing operation.
ii) Traffic Light Response (TLR) is removed when TDR is lost.
• Any emergency gate remaining unlocked for a period exceeding 30 seconds.
A status indication of FAULT & LAMP is indicated if:
• Two or more of the lamps are not working.