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

unsuccessful than try all possible combinations of serial port speeds on both serial port A

& B in case the serial ports were inadvertently set for the wrong speed..

4.3.12 Unable to communicate with the monitor remotely

Check that modem power lights are on and that all cables are connected correctly.

Check phone line using a plug in phone to check the line for operation and for noise.

Check serial port set-up for port A and that it is correct for the modem being used.

Turn monitor off then on with modem connected. This will re-initialise the modem.

4.3.13 LEDs on the SCADA card not behaving normally

Turn off the Monitor and turn it on again.

Check the 5 volt supply. Measurement on the Output Optoisolator test pins is the easiest.

If it is between 4.0 and 4.8 volts then turn off then monitor, remove the top cover, unplug

and re-plug the power supply connectors. If below 4.0 volts replace the main box.

If the 5 volt supply is okay and the problem persists then replace the main box.

4.3.14 Monitor restarting unexpectedly

The symptoms of this are START and STOP entries in the log and possibly the I/O board

has stopped operating with LED1 flashing (indicating too many restarts in the last 5

minutes)

Check the 5 volt supply. Measurement on the Output Optoisolator test pins is the easiest.

If it is between 4.0 and 4.8 volts then turn off then monitor, remove the top cover, unplug

and re-plug the power supply connectors. If below 4.0 volts replace the main box.

4.3.15 Clock stopped or showing invalid time

Reset the time. If this does not fix the problem then either replace the IC in U7 of the

SCADA board in the main box or replace the main box.

The cause is either due to power supply or pre version 3.3 software. Check the 5 volt

supply. Measurement on the Output Optoisolator test pins is the easiest. If it is between

4.0 and 4.8 volts then turn off then monitor, remove the top cover, unplug and re-plug the

power supply connectors. If below 4.0 volts replace the main box.

5 Installation

5.1 Circuit Design Considerations

5.1.1 General

A front (make, or pick) contact of each relay function which is readily available at the hut

is to be provided as an input to the Level Crossing Monitor.

If there is no spare front contacts for a particular relay then a back (break, or drop)

contact may be used instead. When a back contact is used then the expression data

must be altered to allow for the use of a back contact.