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

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,

i.e. 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.

Possible causes for large positive offsets are:

Calibration of the Current Sensors is not as per Section 3.3.4 of this manual.

More than expected lamps operating.

Lamp voltage is set too high.

The wrong type of lamp is installed.

Faulty main box or wiring from current sensor to the main box.

4.3.5 Lamp problem detected while Crossing operating

Check correct number of lamps are operating, they are adjusted to the correct voltage

and they are the correct type.

Wrong number of lamps detected, intermittently or consistently.

Check the calibration of the Current Sensors is as per Section 3.3.4 of this manual.

Check the existing lamp offsets and make a note of them.

Perform a lamp learn.

If the lamp learn accepted all of the new offsets then compare them with the previous

offset values. If their is a difference of more 2 in any offset value then consideration

should be given as what has caused the change. The section Lamp learn rejects results