Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 43 of 118
This document is uncontrolled when printed.
The 5 VDC is fed to the board via the Cable. Test points next to the
connector is used to verify that +5 VDC is present.
All of the '+' terminals of each individual output are bussed together and
connected to the B12 terminals.
The 8-way green connector has each of the 8 switched outputs for
connection to the control devices.
3.6.4 Configuration
There are no configurable items.
3.6.5 Troubleshooting
If there is no power supplied to the Output Optoisolator Board then all
outputs are 'off'.
Two categories of failures are examined, multiple failures on board and
single output failures. The 'Multiple failure' section identifies failure points
that will most likely effect more than one circuit. The 'Single Output
Failure' section provides a comprehensive fault finding procedure of one
output circuit. In the event of a multiple output failure is rectified by
following the multiple output failure procedure, the technician should then
refer to the single output failure section.
3.6.6 Multiple Output Failures On One Board
If the Outputs are permanently OFF then:
Confirm that the monitor is operating correctly and that the NO FAULT and
NO WARNING LEDs are lit on the monitor front panel.
The fault is most likely to be a power supply or connector problem. Check
the LEDs on the suspect circuit board.
If the LEDs are extinguished check: Cable connection
Check the +5V to GND test point next to the D15 connector using a
multimeter
Replace Output Opto Board
Check cable for damage
Replace Level crossing monitor
If the LEDs are illuminated check
B12 power
Check that power is being switched to the output ( at lamp, relay etc.)
Replace output opto board