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If the visit is to investigate a reported fault then on arrival at the site proceed as
follows: Check all signal heads to see what signals are being shown to the road
users, if any. Open the controller door. Make a visual inspection of all of the wiring
and cards.
Check the controller log book to see if any previous visits/faults are similar, as
previous actions may have a bearing on this visit.
Use the user interface to check for any entries in the Controller fault log.
Now proceed with the fault diagnosis.
10.2
Fault Finding Starting From the Fault Indications
The following is a list of indicators in the ST950ELV controller that assist in the
location and diagnosis of a fault. The state of each of these indicators should be
noted on arrival at a site before doing anything else.
10.2.1 Cabinet Alarm Indicator
The LED (behind the manual access door) is normally lit when the controller has
identified a detector fault, and flashes when the Controller has detected a red lamp
fault.
In some installations, the Cabinet Alarm may also be lit for other reasons - refer to
the Works Specification.
10.2.2 Master Switch
This removes the mains supply from the entire controller when opened, i.e.
switched off. Depending on cabinet installation this is normally mounted on a panel
at the bottom of the controller.
10.2.3 Controller Switch
This is normally included in the Master Switch panel and removes power from the
equipment rack and equipment powered from it. This is a single pole switch so does
not provide safety isolation. Also note that the maintenance socket is still powered
when the controller switch is off.
10.2.4 Main CPU Card LEDs
When the controller is initially powered up, it performs various internal checks
before starting normal operation. While these checks are being performed, the
green heartbeat LED flickers and the red system error LED remains illuminated on
the CPU Card.
If these tests fail, it would point to a serious fault on the CPU Card and it should be
replaced. The error message is repeatedly written to the handset display at 1200
baud, and no other handset operations can take place. See the ST950 Family
Handset Handbook for full details.
If the SE (System Error) light is on, then the processor will have shut the system
down and logged a fault – check the fault log.
Security classification
Unrestricted
Version
7
Last Editor
manpreet.jeerh
Document Name
ST950 ICM Handbook
Copyright © Siemens plc 2020. All Rights Reserved.
All manuals and user guides at all-guides.com
Mobility is a division of Siemens Plc
Mobility, Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page
118 of 154
Status
Issued
Date
January 2020
Document No.
667/HE/45950/000
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