The Self-Test Facility; Introduction; Structure Of Self Test - Siemens ST950 Handbook

11 T S
HE ELF
11.1

Introduction

The Self-Test facility can be used to check the hardware fitted to the controller, with
or without a configuration loaded. It has been designed for use in the depot and on
the street by installation / maintenance engineers. A subset of the tests can also be
initiated and monitored from the Tester web page, without the need to cycle the
controller power off/on to start the full Self-Test facility.
The full controller Self-Test is initiated by holding down the level 3 access button
while switching the controller's power on. The button should be released once the
green heartbeat LED starts to flash.
The green heartbeat LED continues to flash during the Self-Test unless a fault is
detected when the red system error LED illuminates.
A 20 character by 4 line handset connected displays information about the checks it
is performing, such as the firmware issue and the lamp supply voltage, both dim
and bright, and details any faults found.
In previous controllers, LEDs on a lamp switch card were used to indicate the
presence of up to three IO cards. The ST950 does not do this.
Self-Test performs the checks detailed on the following pages and reports the error
messages shown if faults have been detected.
11.2

Structure of Self Test

Self Test comprises several parts:
1. Test with lamp supply turned off. Only run when self test initiated by
powering up the controller with the level 3 access button pressed.
o check the integrity of the communications between the processors
o determine how many lamp switch cards are fitted and checks their
o pass control to the EFC CPU so it can start step 3 and display further
o check and displays the mains supply frequency
o check the lamp supply is off and the voltage monitors on all the lamp
2. Test with lamp supply turned on. Only run when self test initiated by
powering up the controller with the level 3 access button pressed.
o Switch on the lamp supply and check the voltage
o Check that all the lamp switch card outputs (V/Mons) remain off
o Check the dim/bright relay and display the dimmed lamp supply
o Check the fail to hardware fail flashing arrangement and display
Security classification
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Copyright © Siemens Mobility Limited 2018. All Rights Reserved.
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EST ACILITY
on the CPU Card
type
inventory information (see section 46.6)
switch card outputs indicate that all the outputs are off
value
whether hardware fail flashing is available and selected
Unrestricted
5
Neil Atkinson
ST950 ICM Handbook
Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page 101 of 125
Status Issued
Date 18-Dec-2018
Document No. 667/HE/46950/000