Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 46 of 118
This document is uncontrolled when printed.
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.
3.6.7 Replacement Procedure
(a) Removal
 Unplug 8 and 2 way connectors by pulling outward from board.
 Remove 15 way I/O cable by unscrewing thumbscrews then
pulling directly outward.
 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
 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.
 If the Opto is upside down, the green base of the Opto can be
pulled apart and the circuit board remove and inserted correctly.
 Plug in the D15 connector. Tighten the thumbscrew to finger tight
ensuring the plastic hood does not distort.
 Plug the green 8 and 2 way connector into there respective
sockets.
3.7 Cables
The cable pin connections for all of the cables are specified in
Specification 1071, Level Crossing Monitor Hardware. Copies are
also in Appendix C of this document.