Fault Finding; Site Visits - Siemens ST950 Handbook

10 F F
AULT INDING
This section contains information to assist in location and diagnosis of faults.
10.1

Site Visits

This section provides a reminder of considerations to be made before visiting a site,
and actions to be taken on site and before leaving.
For the tools and essential spares required when making a site visit, see sections
1.4.2 and Appendix Appendix A.
10.1.1 On Receipt of a Fault Report
When a fault report is received it is recommended that the following are checked:
a) Is the fault a repeat one; i.e. is the fault and its cause known from previous visit.
Why was the controller left faulty? Can it now be cleared? I.e. are the resources
now available to clear it; if so go to site. If not, make an appropriate note in the
fault recording system, or on your fault report.
b) If the report is DFM, i.e. detector fault, check to see if a fault is known to exist on
the site, especially if the fault is reported by an OMU as it may be a repeat alarm
for a reported fault. Because, unlike the controller, most OMUs cannot be made
to ignore faulty loops which have already been reported and, therefore, continue
to raise the alarm.
c) If the controller is under UTC control, check with UTC centre to ensure that the
fault report is not a result of any problem with the UTC, e.g. OTU may be out of
action or faulty.
d) If the Signal State is reported as being All Out, All Red or not giving right-of-way
to one approach try and check with the local authority/police as to whether or not
they know of a requirement for the signals to be in this state.
e) Before leaving for the site check that after clearance of the fault the controller
can be re-commissioned and switched on again, in some cases the local
authority may require the signals left off.
10.1.2 Before Going to a Site
Before leaving for a site visit, it is recommended that the following be checked:
a) Check that you have the correct equipment and sufficient spares to do the job
you are going out to do. See spares list in the appendix.
b) Check that all your spares are good; i.e. check that the replacement cards have
labels with test and inspection stamps on them. Ensure that none of the cards
have labels on them that would indicate that they are suspect or have been
removed from a faulty site.
10.1.3 On Arrival at the Site
If the visit is to install additional equipment or perform an annual inspection,
proceed with the installation or inspection procedure.
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Copyright © Siemens Mobility Limited 2018. All Rights Reserved.
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Neil Atkinson
ST950 ICM Handbook
Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page 87 of 125
Status Issued
Date 18-Dec-2018
Document No. 667/HE/46950/000