Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 28 of 118
This document is uncontrolled when printed.
If the Board Error LED (LED1) is 'ON' or flashing than the monitor has
been reset too many times in the last five minutes (indicating a
possible fault). Press the reset pushbutton once to see if the I/O
Board comes good. If the error LED1 remains 'ON' then replace the
board with a spare.
Suspect boards may be swapped with another board (preferably a
spare). Make sure it is correctly configured before installation.
Normally the EPROM from the faulty board is moved to the
replacement board as it is unusual for these to fail. Note that the
configuration information for the monitor is contained in the DALLAS
1235 SRAM and 1244Y SRAM and clock chips. If a new I/O board is
installed without swapping over the old DALLAS chips than the
configuration file will have to be uploaded and a lamp learn will be
have to be completed.
Make sure the I/O Board is fully seated in its connectors.
Make sure the current version EPROM (R3.7 or later) is installed.
Make sure all the jumpers are installed in their correct positions and
that the correct ICs are installed.
3.2.2.6 Replacement Procedure
The monitor should be turned off.
The ADC board mounted on top of the I/O board must be removed
first by undoing the retaining screw and lifting the board off the
connector.
Remove any connectors plugged into the front of the I/O Board and
eject the board from its slot position by using the front panel card
ejectors (push outwards). Make sure front panel retaining screws are
first unscrewed. In some cases the bottom of the board may foul
against the bottom of the front panel cut-out. It may be necessary to
slightly flex the card to allow it to clear the slot as the card is removed.
Insert an I/O Board into the slot, ensuring that it is pushed all the
way in to get a good connection with all pins in the rear connectors.
Replace any connectors that were plugged into the front of the I/O
Board.
The I/O Board may be difficult to slide in because of the anti-vibration
card guides. If this is the case, wiggle the board as you push it in.
Once pushed in reset the board.
Replace the ADC board and the retaining screw and ensure the
ribbon cable is properly connected to the board.
3.2.3 Power Supply Units (PSU)
The power supply is a DC to DC switch mode power supply which
operates from 10 to 30 volts. It has triple outputs. Output Voltage
one