Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 69 of 118
This document is uncontrolled when printed.
5.3.4 Lamp Learn rejects the results
An example of lamp learn rejecting the results is as follows:
Run crossing for a minimum of 40 seconds to complete a lamp learn.
Start lamps now...
LAMP OFFSETS
Lamp Channel 2 SS_LAMPS Flasher UP Offset = 1.55 Accepted
Lamp Channel 2 SS_LAMPS Flasher DN Offset = 0.55 Accepted
Lamp Channel 4 CS_LAMPS Flasher UP Offset = -0.45 Accepted
Lamp Channel 4 CS_LAMPS Flasher DN Offset = -14.45 Not
Accepted
In the example above the CS_LAMPS (Country Side lamps) Flasher
DN (Flasher Down, ie. the lamps operating when the flasher contact
12 and 13 are made) had an offset that was outside acceptable
limits and therefore rejected.
The lamp learn offsets are limited to greater than -10.0 and less
than +10.0.
Negative offsets are due to lamp currents that are less than expected.
Positive offsets are due to lamp currents that are greater than
expected.
Possible causes for large negative offsets
are: Fewer than expected lamps operating.
Calibration of the Current Sensors is not as per Section 3.3.4 of this
manual.
The lamp circuit wire is fed through the current sensor in the wrong
direction.
Lamp voltage is set too low.
The wrong type of lamp is installed (ensure only 10V 25 Watt lamps
are used).
The Flasher is faulty such that it has a large voltage drop when
turned ON.
Bad connection between a lamp and its base.
Bad connection in the lamp circuit.
Faulty current sensor.
Faulty main box or wiring from current sensor to the main box.