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

2.11 Battery test resistor

The requirements for the battery test resistor are: 1.5 – 1.7 ohm with an operating current

of 7.5 – 10A at 18VDC (approximately 150 Watts) for periods of 10 minutes at a time.

The battery test resistor can be made up by mounting 2 x 3.3 ohm 100 Watt resistors (RS

136-200) with heatsink compound (RS 554-331) to a 0.75 degree/Watt Heatsink (RS 400-

028). This heatsink will require self tapping screws to mount the resistors which use M4

bolts to connect a criped lug to the resistor terminal. Soldered connections should be

avoided as the cycle heating of the resistor will fatigue the solder joints. The two resistors

must be connected in parallel to give approximately 1.7 ohm resistance. This heatsink

gets hot during use and must be mounted clear of other equipment. Contact Signal

Engineering Services for further details.

A second alternative would be to use two 1ohm adjustable resistors in series (as used

with the Safeflash flasher unit for pairs of level crossing lamps). The resistors are

available from Westinghouse Brake & Signal Co. Australia. Safetran Part Number

029602-3X. The resistors should be adjusted to approximately 0.75 ohm each so that the

load is evenly shared between the two resistors.

A third alternative is to use a second hand AC track resistor with the two 3 ohm barrels

connected in parallel. Please leave the wiper connected as there have been a number of

cases were the 3 ohm barrels were in fact 4 ohm each giving a total resistance of 2 ohm.

This resulted in failed battery tests as the minimum load current of 6 amps was not

obtained.

2.12 Signage for Remote Battery Test Sites.

For level crossing installation where a Control Centre is initiating remote battery testing at

level crossings and there are no local crossing tests conducted by contractors or railway

staff then identification signage is required to be installed at the level crossing. The signs

shall be in accordance with SPC 521 ‘Level Crossing Identification Sign’, and SPG 0724.

The signs are to be installed facing the road traffic. The signs are to be visible from the

Stop point for motor vehicles using the level crossing in both directions. This requirement

may be satisfied by installing one or more signs on the level crossing hut wall or door.

If the hut is placed in a awkward position then the sign may need to be installed on a

separate post facing the road (i.e. facing 90 degrees to the track). In some cases it may

be necessary to install a sign on each side of the level crossing.

3 Systems Maintenance Program

3.1 Maintenance Tasks

3.1.1 Corrective Maintenance

Fault finding and fault rectification is discussed in section 5 on Fault Diagnosis and the

Operation and Functional Checks for each module in section 3.

3.1.2 Preventative Maintenance

Preventative maintenance is recommended once every 12 months and should consist of

the following:

• Observe the front LEDs for correct state and operation.