ST950S Plus+ Installation and Commissioning Manual
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 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, 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.
10.2. Fault Finding using the Fault Log and
Discrepancy Report
Important:
A review of the controller fault log is the always the first step in resolving Plus+ issues.
If 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.
10.3. Fault Finding Starting from the Fault Indications
The following is a list of switches and indicators in the ST950 Plus
+
controller that assist in the 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.
10.3.1. 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.
10.3.2. 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.
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