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

If the output is OFF when it should be ON and the LED is extinguished

The fault is unlikely to be in the Output Opto Board. Check in the following order until the

problem is rectified:

Double check inputs associated with this output. The output may be behaving correctly,

but there may be a faulty input giving the system the wrong information.

Check I/O Cable connections.

Check I/O Cable for damage.

Replace the main box.

The output is ON when it should be OFF and the LED is lit

The fault is unlikely to be in the Output Opto Board. Check in the following order until the

problem is rectified:

Double check inputs associated with this output. The output may be behaving correctly,

but there may be a faulty input giving the system the wrong information.

Check I/O Cable connections.

Replace associated I/O board.

Check I/O Cable for damage.

The output is ON when it should be OFF and the LED is extinguished

Possible short in the output circuit. Unplug the associated 8-way connector. If the output

turns 'off', then replace the Output Opto Board. If the output remains 'on', check 8-way

connector and signalling circuit for external short.

2.6.7 Replacement Procedure

a) Removal

i) Unplug 8 and 2 way connectors by pulling outward from board.

ii) Remove 15 way I/O cable by unscrewing thumbscrews then pulling

directly outward.

iii) Remove Opto Board by twisting it off the Klippon rail. Pull on board at the

thick side of the Klippon rail while holding board a the thin side of Klippon

rail.

b) Installation

i) Looking at the mounting feet on the base of the Opto board, one side has

a square hole running along the base of the board with a lip that extends

to be in line with the side of the board. This side goes toward the thick

side of the Klippon rail. The other end has a clip which extends diagonally

outward from the base of the board. The notch at the end of this clip is

inserted into the edge of the rail at the thin end of the Klippon rail.

Position this notch on the rail first then clip the board into place by

pushing the board at the thick side of the rail. Check that the board is in

place by lightly tugging on the board. Do not twist the board.