Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 35 of 118
This document is uncontrolled when printed.
sensitivity to induction from adjacent circuits. See section 3.3.4 above for
details on interference with the current sensor.
Note that if it is a new installation you must ensure that the wire is
threaded through the measurement aperture in the correct direction
otherwise the sensor will not operate. It is sensitive to the direction of
current flow. Refer to drawing M08-854.
3.3.6 Replacement
Disconnect the wiring from terminals 1 to 4. Make sure these are
identified and will not be shorted out.
Unclip the current sensor from the Klippon rail. Confirm that their will be
no trains approaching and that it is safe to disconnect the wire through
the current sensor if it is on a lamp circuit. Disconnect the wire
threaded through the current sensor measurement aperture.
Thread the wire through the measurement aperture for the new current
sensor. Ensure that the wire is securely attached and that the lamp
resistor has not been damaged or interfered with.
Make sure the link on the replacement unit is set the same as the
original current sensor.
NOTE: Ensure that the wire is threaded through the measurement
aperture in the same direction otherwise the sensor will not operate. It is
sensitive to the direction of the current.
3.4 VIO
3.4.1 Description
The VIO is a Vital Indication Optoisolator. It is a Klippon rail mounted
device. The module has an identification label of "S-2000 J 1.1 xxV
VITAL INDICATION OPTOISOLATOR". Refer to drawing M08-559 for
details of its physical aspects. xxV is either 12V for monitoring 12 volt
circuits or 50V for monitoring 50 volt circuits. Refer to drawing M08-
558/2 Circuit details.
A 12V VIO must never be used on 50
volt Vital Signalling Circuits.
Although a 12V VIO will work on a 50V DC circuit a failure of the 12V
unit could result in excessive current being drawn from the 50V circuit it
is connected to.
All VIOs are clearly labelled with their working voltages on the main
label of the unit and on the left edge of the unit when viewed from the
side.
CAUTION