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

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

If the Outputs are permanently ON then

Check the LED on the suspect circuit board.

If the LEDs are extinguished check:

Replace Output Opto board

If the LEDs on the suspect circuits are lit check:

I/O Cable connection

Replace Output Opto Board

Replace Main Box

Check cable for damage

2.6.6.1 Testing a Single Output

Determine the expected state of the output. Compare the expected state with the state of

the LED in the Output Opto Board for the suspect circuit.

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

The fault exists in the Output Opto Board or the signalling system. Check in the following

order until the problem is rectified

Check that power is being switched to the output device (i.e. check for blown lamp or fuse

etc.).

Check that the supply side of the contact has power if a positive switch wire (on '+'

terminal)

Replace Output Opto Board.

The Output Opto board can be double checked by removing the orange 8 way connector.

Place an Ohmmeter across the '+' and '-' terminals. If the reading is less than 15 Ohms,

then the circuit is OK. If the reading is a open circuit then the circuit is faulty, therefore

replace board (or you can try just replacing the AQV214H but ensure the orientation is

correct).

Replace the individual Optoisolator IC or the complete Output Opto Board.

The Output Opto board can be double checked by removing the orange 8 way connector.

Place an Ohmmeter across the '+' and '-' terminals. If the reading is less than 15 Ohms,

then the circuit is OK. If the reading is a open circuit then the circuit is faulty, therefore

replace board (or you can try just replacing the Opto Isolator chip AQV214H but ensure

the orientation is correct).