Fault Finding Using The Fault Log And Discrepancy Report; Fault Finding Starting From The Fault Indications - Siemens ST950 Plus+ User Manual

ST950 Plus+ User Manual
9.1.3 On Arrival at the Site
If the visit is to install additional equipment or perform an annual inspection, then proceed with
the installation or inspection procedure.
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.

Fault Finding using the Fault Log and Discrepancy Report

Controller Fault Log
A review of the controller fault log is the always the first step in resolving Plus+ issues.
I f a large number of discrepancies are listed by the Controller at power-up – reporting that a
number of nodes are in the wrong part of the network - check that the CIC address switches
are set correctly.

Fault Finding Starting from the Fault Indications

The following is a list of switches and indicators in the ST950 Plus
location and diagnosis of a fault. The state of each of these switch indicators should be noted on
arrival at a site before doing anything else.
9.3.1 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.
9.3.2 Master Switch
This removes the mains supply from the entire controller when opened, i.e. switched off. This is
mounted on a panel at the bottom right of the controller. If there is an adjacent expansion cabinet,
the Master Switch in the main cabinet also removes mains 230V power to the expansion cabinet.
9.3.3 Controller Switch
This is 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. If
there is an adjacent expansion cabinet, mains 230V power to the expansion cabinet is NOT
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