Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 76 of 118
This document is uncontrolled when printed.
A 10 cell level crossing will draw approximately 15A for the duration of
the 2 minute test using the Test Switch box. A 12 cell level crossing
draws approximately 23A for the duration of the test. The equivalent
ampere - hour drains on the batteries are 0.5AH for 10 cells and
0.76AH for 12 cells. The remote test of the Level Crossing Battery
using the level crossing monitor should provide a similar load test.
A 1.5resistor is used as the Battery test load. Allowing for losses in
wiring the following maximum currents will be drawn.
Voltage Number of
cells
Test
Resistance
MAX
Current
Required
AH
Time
needed
15V 12 cells
1 . 5 1 0 A
0.76A 280
seconds
12V
10 cells
1 . 5 8 A
0.50A 225
seconds
A remote test duration of 5 minutes was chosen as an adequate test
time.
6.2 Equipment Installation
Signalling wiring 7/0.4 should be terminated with red bootlace ferrules.
Either a Cable Accessories BLP 100, a Klippon 901908, a Wago 216-
203, or a Phoenix 3200030. The Cable Accessories HNKE4, and
Klippon PZ4 crimp tools are suitable.
The main box is normally secured to the top of the relay rack. It is
designed to be mounted horizontally but may be mounted vertically.
Space should be left above the main box so that the top cover can
easily be removed.
Current sensors, VIOs, input optoisolators, and output optoisolator are
mounted on DIN rail. The modem is typically sat on the monitor box.
The cables are laid in the cable ducts and the screw locks at both ends
screwed up.
The wire run through the current sensors must be run so that the
direction of +ve current flow is in the direction marked on the current
sensor. The current sensors will not work if the current flow through the
sense wire is in the wrong direction.
The battery test load resistor generates a significant amount of heat
while a battery test is being conducted. Therefore space must be left
above the resistor so that relays etc mounted above the resistor are not
damaged over time by the heat generated.
6.3 Hardware Configuration
Refer to the level crossing monitor block diagram in Appendix C and
drawing X14 - X26 & X49, X50 of the Standard Circuits or the particular
circuits for the level crossing.