Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 54 of 118
This document is uncontrolled when printed.
5. AC SUPPLY Relay: HH23PW-T 120V AC. This relay is a 11-pin
relay with 3 changeover contacts MI No:06600506. This relay ,
matching base and clips is available from RSA stores. The 11-pin
base is MI No:06600076. Note that this relay is not always required.
Refer to item 2 for details of the HH23PW bases.
3.11 Battery test resistor
The battery test resistor is a 150 watt, 1.5 ohm resistor.
The standard AC track resistor which is available from stores/second
hand may be used 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 ohms giving a total
resistance of 2 ohms. This resulted in failed battery tests as the
minimum load current of 6 amps was not obtained.
Using new resistors is not recommended for a level crossing
installation due to their excessive cost. Try and reuse second hand
resistors.
If the AC track resistor is not available at a suitable price than
alternatives can be used. The criterion for any resistor is that it can
handle 7.5-10A at 18VDC for periods of 10 minutes at a time.
A possible alternative would be to use two 1 ohm 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
(appox $50 each). The resistors should each be adjusted to
approximately 0.75ohms each so that the load is evenly shared
between the two resistors.
3.12 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 RSA station staff than
some additional signage is required to be installed at the level
crossing.
This additional signage and phone number is required to allow easier
access for the public to notify the rail operators of potential faults or
damage at the level crossing.
The following example sign or something similar is to be installed on
the level crossing which uses remote battery testing.