Specifications

RailCorp Engineering Manual — Signals — Equipment Manual

Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261

Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1

39-40 43-44 47-48 49-50 51-52 53-54 55-56

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Drawing M08-781 SCADA-2000 A/2.0 I/O Board jumper allocations (marked up for LX

monitor) shows the location and setting of the links.

2.2.2.5 Troubleshooting

Check the LED indications on the I/O Board for correct operation (see section above).

Check 5 volt supply is greater than 4.75 volts and less than 5.25 volts. It is easiest to

check this on the input or output Optoisolator board test pins.

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.

2.2.2.6 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.

2.2.3 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 is +5 VDC @ 6.0 A maximum. Output