ST950S Plus+ Installation and Commissioning Manual
Important:
As soon as certain user actions are accepted (e.g. ‘Acknowledge’ in the Fault Log), the Signals
on the Node will illuminate in whatever state is required for the Phase. As field support the user
should either:
•
Trigger the action at a suitable point in the traffic sequence, e.g. Phase at Red with the
traffic on that approach already stationary
•
It is therefore expected that the Plus+ Signal is bagged when it is fitted to a Pole
(whether it is new or existing) until it is checked. This applies to ALL signal included but
not limited to RAG, Near-Sides and Waits.
Important:
If a failed Node cannot be replaced and is going to be left (e.g. no spare is currently available),
the Node should be disconnected (from its Bypass Module) to isolate the 48V supply from
those Signals.
If the Node cannot be replaced within 28 days, the engineer must acknowledge on the Lost
Nodes web page that the Node has been physically disconnected, otherwise the Plus+
Controller will switch off all 48V supplies, extinguishing all the signals. Section
contains more information.
10.5.1. Replacement of a RAG Node
The RAG (Red Amber Green) Node can be hot swapped, in most cases, as part of a maintenance
procedure.
CAUTION:
When replacing Nodes, the technician should consider the ‘Last Lamp’. If the ‘Last Lamp’
of any phase will be extinguished due to the replacement of a Node, a correspondence /
compliance error will be registered by the controller and the site (or stream; depending on
configuration) will be extinguished.
The process of removal is as follows;
1. Open the Green Aspect door, on the traffic head that contains the relevant Node.
2. Remove the Bypass ribbon cable connection PL4.
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