Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 32 of 118
This document is uncontrolled when printed.
3.2.5.3 Configuration and Set-up
The configuration links on the backplane are not used by the level
crossing monitor. They should however be set to the following:
375kbps link set (link between the two bottom pins)
The node address connections should be left as set by the factory.
3.2.5.4 Troubleshooting
If the backplane is suspected then it is best to test it by continuity
testing the relevant circuits on the backplane. If this is okay test for
shorts to test circuits. Close inspection can only be done by
removing the backplane PCB as there are printed circuit board
tracks on both sides of the PCB.
It has been discovered that the 5.1 V Transorb designed to protect
the 5V supply is susceptible to failing short circuit after a power
surge or lightning strike hits the level crossing location. If this
transzorb has failed short circuit than the level crossing monitor will
draw excessive current blowing the 4A supply fuse. As a temporary
measure you can disconnect the failed transzorb with a pair of side
cutters. The level crossing monitor may then function correctly,
although other components on the surge protection and power
supply board may have failed open circuit or PCB tracks may be
damaged.
3.2.5.5 Replacement Procedure
Remove the I/O board, ADC board and the DC/DC converter power
supply to allow access to the backplane PCB. Removal is done by
removing all of the mounting screws disconnecting the 10-way
ribbon cable, disconnecting the 4 power supply wires and lifting the
board out.
On replacement of the backplane PCB ensure that the power supply
wires are connected to their proper terminals. Incorrect wire
placement will cause extensive damage to most components. See
Specification 1072 if you are unsure of the proper connections for
the power supply to backplane connections.
3.3 Current sensor
3.3.1 Description
The current sensor is a Klippon rail mounted device. The module
has an identification label of "LXMON/2.0 CSN". Refer to drawing
M08-854 for details of its physical aspects.
Refer to drawing M08-855 in Appendix D for circuit drawing.